2004-03-26 18:35:46

by Martin Schwidefsky

Subject: [PATCH] s390 (6/7): system call speedup part 1.

System call speedup part 1.

diffstat:
arch/s390/kernel/asm-offsets.c | 11 +
arch/s390/kernel/binfmt_elf32.c | 25 +-
arch/s390/kernel/compat_signal.c | 6
arch/s390/kernel/entry.S | 346 ++++++++++++++++++++++++---------------
arch/s390/kernel/entry64.S | 322 +++++++++++++++++++++++-------------
arch/s390/kernel/process.c | 20 +-
arch/s390/kernel/ptrace.c | 107 +++++++-----
arch/s390/kernel/s390_ksyms.c | 2
arch/s390/kernel/setup.c | 3
arch/s390/kernel/signal.c | 17 +
arch/s390/kernel/traps.c | 21 +-
arch/s390/lib/uaccess.S | 254 +++++++++++++++++-----------
arch/s390/lib/uaccess64.S | 253 +++++++++++++++++-----------
arch/s390/mm/fault.c | 8
arch/s390/mm/init.c | 4
15 files changed, 878 insertions(+), 521 deletions(-)

diff -urN linux-2.6/arch/s390/kernel/asm-offsets.c linux-2.6-s390/arch/s390/kernel/asm-offsets.c
--- linux-2.6/arch/s390/kernel/asm-offsets.c Fri Mar 26 18:24:53 2004
+++ linux-2.6-s390/arch/s390/kernel/asm-offsets.c Fri Mar 26 18:25:59 2004
@@ -17,10 +17,10 @@
int main(void)
{
DEFINE(__THREAD_info, offsetof(struct task_struct, thread_info),);
- DEFINE(__THREAD_ar2, offsetof(struct task_struct, thread.ar2),);
- DEFINE(__THREAD_ar4, offsetof(struct task_struct, thread.ar4),);
DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp),);
DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info),);
+ DEFINE(__THREAD_mm_segment,
+ offsetof(struct task_struct, thread.mm_segment),);
BLANK();
DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid),);
DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address),);
@@ -31,5 +31,12 @@
DEFINE(__TI_flags, offsetof(struct thread_info, flags),);
DEFINE(__TI_cpu, offsetof(struct thread_info, cpu),);
DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count),);
+ BLANK();
+ DEFINE(__PT_PSW, offsetof(struct pt_regs, psw),);
+ DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs),);
+ DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2),);
+ DEFINE(__PT_ILC, offsetof(struct pt_regs, ilc),);
+ DEFINE(__PT_TRAP, offsetof(struct pt_regs, trap),);
+ DEFINE(__PT_SIZE, sizeof(struct pt_regs),);
return 0;
}
diff -urN linux-2.6/arch/s390/kernel/binfmt_elf32.c linux-2.6-s390/arch/s390/kernel/binfmt_elf32.c
--- linux-2.6/arch/s390/kernel/binfmt_elf32.c Thu Mar 11 03:55:44 2004
+++ linux-2.6-s390/arch/s390/kernel/binfmt_elf32.c Fri Mar 26 18:25:59 2004
@@ -57,18 +57,7 @@
/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
now struct_user_regs, they are different) */

-#define ELF_CORE_COPY_REGS(pr_reg, regs) \
- { \
- int i; \
- memcpy(&pr_reg.psw.mask, &regs->psw.mask, 4); \
- memcpy(&pr_reg.psw.addr, ((char*)&regs->psw.addr)+4, 4); \
- for(i=0; i<NUM_GPRS; i++) \
- pr_reg.gprs[i] = regs->gprs[i]; \
- for(i=0; i<NUM_ACRS; i++) \
- pr_reg.acrs[i] = regs->acrs[i]; \
- pr_reg.orig_gpr2 = regs->orig_gpr2; \
- }
-
+#define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg);


/* This yields a mask that user programs can use to figure out what
@@ -107,6 +96,18 @@
} s390_regs32;
typedef s390_regs32 elf_gregset_t;

+static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs)
+{
+ int i;
+
+ memcpy(&regs->psw.mask, &ptregs->psw.mask, 4);
+ memcpy(&regs->psw.addr, &ptregs->psw.addr, 4);
+ for (i = 0; i < NUM_GPRS; i++)
+ regs->gprs[i] = ptregs->gprs[i];
+ regs->orig_gpr2 = ptregs->orig_gpr2;
+ return 1;
+}
+
#include <asm/processor.h>
#include <linux/module.h>
#include <linux/config.h>
diff -urN linux-2.6/arch/s390/kernel/compat_signal.c linux-2.6-s390/arch/s390/kernel/compat_signal.c
--- linux-2.6/arch/s390/kernel/compat_signal.c Fri Mar 26 18:25:13 2004
+++ linux-2.6-s390/arch/s390/kernel/compat_signal.c Fri Mar 26 18:25:59 2004
@@ -297,7 +297,8 @@
regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
for (i = 0; i < NUM_GPRS; i++)
regs32.gprs[i] = (__u32) regs->gprs[i];
- memcpy(regs32.acrs, regs->acrs, sizeof(regs32.acrs));
+ save_access_regs(current->thread.acrs);
+ memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
err = __copy_to_user(&sregs->regs, &regs32, sizeof(regs32));
if (err)
return err;
@@ -323,7 +324,8 @@
regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
for (i = 0; i < NUM_GPRS; i++)
regs->gprs[i] = (__u64) regs32.gprs[i];
- memcpy(regs->acrs, regs32.acrs, sizeof(regs32.acrs));
+ memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
+ restore_access_regs(current->thread.acrs);

err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
sizeof(_s390_fp_regs32));
diff -urN linux-2.6/arch/s390/kernel/entry.S linux-2.6-s390/arch/s390/kernel/entry.S
--- linux-2.6/arch/s390/kernel/entry.S Fri Mar 26 18:24:53 2004
+++ linux-2.6-s390/arch/s390/kernel/entry.S Fri Mar 26 18:25:59 2004
@@ -25,40 +25,32 @@
* The first few entries are identical to the user_regs_struct.
*/
SP_PTREGS = STACK_FRAME_OVERHEAD
-SP_PSW = STACK_FRAME_OVERHEAD + PT_PSWMASK
-SP_R0 = STACK_FRAME_OVERHEAD + PT_GPR0
-SP_R1 = STACK_FRAME_OVERHEAD + PT_GPR1
-SP_R2 = STACK_FRAME_OVERHEAD + PT_GPR2
-SP_R3 = STACK_FRAME_OVERHEAD + PT_GPR3
-SP_R4 = STACK_FRAME_OVERHEAD + PT_GPR4
-SP_R5 = STACK_FRAME_OVERHEAD + PT_GPR5
-SP_R6 = STACK_FRAME_OVERHEAD + PT_GPR6
-SP_R7 = STACK_FRAME_OVERHEAD + PT_GPR7
-SP_R8 = STACK_FRAME_OVERHEAD + PT_GPR8
-SP_R9 = STACK_FRAME_OVERHEAD + PT_GPR9
-SP_R10 = STACK_FRAME_OVERHEAD + PT_GPR10
-SP_R11 = STACK_FRAME_OVERHEAD + PT_GPR11
-SP_R12 = STACK_FRAME_OVERHEAD + PT_GPR12
-SP_R13 = STACK_FRAME_OVERHEAD + PT_GPR13
-SP_R14 = STACK_FRAME_OVERHEAD + PT_GPR14
-SP_R15 = STACK_FRAME_OVERHEAD + PT_GPR15
-SP_AREGS = STACK_FRAME_OVERHEAD + PT_ACR0
-SP_ORIG_R2 = STACK_FRAME_OVERHEAD + PT_ORIGGPR2
-/* Now the additional entries */
-SP_ILC = (SP_ORIG_R2+GPR_SIZE)
-SP_TRAP = (SP_ILC+2)
-SP_SIZE = (SP_TRAP+2)
+SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
+SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
+SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4
+SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
+SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12
+SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
+SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20
+SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
+SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28
+SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
+SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36
+SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
+SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44
+SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
+SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52
+SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
+SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60
+SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
+SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
+SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
+SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE

_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_RESTART_SVC)
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)

-/*
- * Base Address of this Module --- saved in __LC_ENTRY_BASE
- */
- .globl entry_base
-entry_base:
-
-#define BASED(name) name-entry_base(%r13)
+#define BASED(name) name-system_call(%r13)

/*
* Register usage in interrupt handlers:
@@ -68,55 +60,108 @@
* R15 - kernel stack pointer
*/

- .macro SAVE_ALL_BASE
- stm %r13,%r15,__LC_SAVE_AREA
- basr %r13,0 # temp base pointer
-0: stam %a2,%a4,__LC_SAVE_AREA+12
- l %r13,.Lentry_base-0b(%r13)# load &entry_base to %r13
+ .macro SAVE_ALL_BASE psworg,savearea,sync
+ stm %r12,%r15,\savearea
+ l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
.endm

- .macro SAVE_ALL psworg,sync # system entry macro
- tm \psworg+1,0x01 # test problem state bit
+ .macro CLEANUP_SAVE_ALL_BASE psworg,savearea,sync
+ l %r1,SP_PSW+4(%r15)
+ cli 1(%r1),0xcf
+ jne 0f
+ mvc \savearea(16),SP_R12(%r15)
+0: st %r13,SP_R13(%r15)
+ .endm
+
+ .macro SAVE_ALL psworg,savearea,sync
.if \sync
+ tm \psworg+1,0x01 # test problem state bit
bz BASED(1f) # skip stack setup save
+ l %r15,__LC_KERNEL_STACK # problem state -> load ksp
.else
- bnz BASED(0f) # from user -> load kernel stack
+ tm \psworg+1,0x01 # test problem state bit
+ bnz BASED(0f) # from user -> load async stack
l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
slr %r14,%r15
sra %r14,13
be BASED(1f)
- l %r15,__LC_ASYNC_STACK # load async. stack
- b BASED(1f)
+0: l %r15,__LC_ASYNC_STACK
.endif
-0: l %r15,__LC_KERNEL_STACK # problem state -> load ksp
- lam %a2,%a4,BASED(.Lc_ac) # set ac.reg. 2 to primary space
- # and ac.reg. 4 to home space
1: s %r15,BASED(.Lc_spsize) # make room for registers & psw
- n %r15,BASED(.Lc0xfffffff8) # align stack pointer to 8
- stm %r0,%r12,SP_R0(%r15) # store gprs 0-12 to kernel stack
+ l %r14,BASED(.L\psworg)
+ slr %r12,%r12
+ icm %r14,12,__LC_SVC_ILC
+ stm %r0,%r11,SP_R0(%r15) # store gprs 0-12 to kernel stack
st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
- mvc SP_R13(12,%r15),__LC_SAVE_AREA # move R13-R15 to stack
- stam %a0,%a15,SP_AREGS(%r15) # store access registers to kst.
- mvc SP_AREGS+8(12,%r15),__LC_SAVE_AREA+12 # store ac. regs
+ mvc SP_R12(16,%r15),\savearea # move R13-R15 to stack
mvc SP_PSW(8,%r15),\psworg # move user PSW to stack
- mvc SP_ILC(2,%r15),__LC_SVC_ILC # store instruction length
- mvc SP_TRAP(2,%r15),BASED(.L\psworg) # store trap indication
- xc 0(4,%r15),0(%r15) # clear back chain
+ st %r14,SP_ILC(%r15)
+ st %r12,0(%r15) # clear back chain
.endm

- .macro RESTORE_ALL sync # system exit macro
+ .macro CLEANUP_SAVE_ALL psworg,savearea,sync
+ l %r1,\savearea+12
+ .if \sync
+ tm \psworg+1,0x01
+ bz BASED(1f)
+ l %r1,__LC_KERNEL_STACK
+ .else
+ tm \psworg+1,0x01
+ bnz BASED(0f)
+ l %r0,__LC_ASYNC_STACK
+ slr %r0,%r1
+ sra %r0,13
+ bz BASED(1f)
+0: l %r1,__LC_ASYNC_STACK
+ .endif
+1: s %r1,BASED(.Lc_spsize)
+ st %r1,SP_R15(%r15)
+ l %r0,BASED(.L\psworg)
+ xc SP_R12(4,%r15),SP_R12(%r15)
+ icm %r0,12,__LC_SVC_ILC
+ st %r0,SP_R14(%r15)
+ mvc SP_R0(48,%r1),SP_R0(%r15)
+ mvc SP_ORIG_R2(4,%r1),SP_R2(%r15)
+ mvc SP_R12(16,%r1),\savearea
+ mvc SP_PSW(8,%r1),\psworg
+ st %r0,SP_ILC(%r1)
+ xc 0(4,%r1),0(%r1)
+ .endm
+
+ .macro RESTORE_ALL # system exit macro
mvc __LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore
- lam %a0,%a15,SP_AREGS(%r15) # load the access registers
- lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
+ lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
lpsw __LC_RETURN_PSW # back to caller
.endm

+ .macro CLEANUP_RESTORE_ALL
+ l %r1,SP_PSW+4(%r15)
+ cli 0(%r1),0x82
+ jne 0f
+ mvc SP_PSW(8,%r15),__LC_RETURN_PSW
+ j 1f
+0: l %r1,SP_R15(%r15)
+ mvc SP_PSW(8,%r15),SP_PSW(%r1)
+ mvc SP_R0(64,%r15),SP_R0(%r1)
+1:
+ .endm
+
.macro GET_THREAD_INFO
- l %r9,BASED(.Lc0xffffe000) # load pointer to task_struct to %r9
- al %r9,__LC_KERNEL_STACK
+ l %r9,__LC_THREAD_INFO
.endm

+ .macro CHECK_CRITICAL
+ tm SP_PSW+1(%r15),0x01 # test problem state bit
+ bnz BASED(0f) # from user -> not critical
+ clc SP_PSW+4(4,%r15),BASED(.Lcritical_end)
+ jnl 0f
+ clc SP_PSW+4(4,%r15),BASED(.Lcritical_start)
+ jl 0f
+ l %r1,BASED(.Lcleanup_critical)
+ basr %r14,%r1
+0:
+ .endm

/*
* Scheduler resume function, called by switch_to
@@ -139,13 +184,10 @@
stm %r6,%r15,24(%r15) # store __switch_to registers of prev task
st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
- stam %a2,%a2,__THREAD_ar2(%r2) # store kernel access reg. 2
- stam %a4,%a4,__THREAD_ar4(%r2) # store kernel access reg. 4
- lam %a2,%a2,__THREAD_ar2(%r3) # load kernel access reg. 2
- lam %a4,%a4,__THREAD_ar4(%r3) # load kernel access reg. 4
lm %r6,%r15,24(%r15) # load __switch_to registers of next task
st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
l %r3,__THREAD_info(%r3) # load thread_info from task struct
+ st %r3,__LC_THREAD_INFO
ahi %r3,8192
st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
br %r14
@@ -172,6 +214,7 @@
lm %r12,%r15,24(%r12)
br %r14

+__critical_start:
/*
* SVC interrupt handler routine. System calls are synchronous events and
* are executed with interrupts enabled.
@@ -179,10 +222,10 @@

.globl system_call
system_call:
- SAVE_ALL_BASE
- SAVE_ALL __LC_SVC_OLD_PSW,1
+ SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
lh %r7,0x8a # get svc number from lowcore
- stosm 24(%r15),0x03 # reenable interrupts
+sysc_enter:
GET_THREAD_INFO # load pointer to task_struct to R9
sla %r7,2 # *4 and test for svc 0
bnz BASED(sysc_do_restart) # svc number > 0
@@ -193,7 +236,7 @@
sla %r7,2 # *4
sysc_do_restart:
tm __TI_flags+3(%r9),_TIF_SYSCALL_TRACE
- l %r8,sys_call_table-entry_base(%r7,%r13) # get system call addr.
+ l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
bo BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
@@ -201,19 +244,17 @@
# changing anything here !!

sysc_return:
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
tm SP_PSW+1(%r15),0x01 # returning to user ?
bno BASED(sysc_leave)
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bnz BASED(sysc_work) # there is work to do (signals etc.)
sysc_leave:
- RESTORE_ALL 1
+ RESTORE_ALL

#
# recheck if there is more work to do
#
sysc_work_loop:
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bz BASED(sysc_leave) # there is no work to do
@@ -234,7 +275,6 @@
# _TIF_NEED_RESCHED is set, call schedule
#
sysc_reschedule:
- stosm 24(%r15),0x03 # reenable interrupts
l %r1,BASED(.Lschedule)
la %r14,BASED(sysc_work_loop)
br %r1 # call scheduler
@@ -243,12 +283,10 @@
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
- stosm 24(%r15),0x03 # reenable interrupts
la %r2,SP_PTREGS(%r15) # load pt_regs
sr %r3,%r3 # clear *oldset
l %r1,BASED(.Ldo_signal)
basr %r14,%r1 # call do_signal
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
tm __TI_flags+3(%r9),_TIF_RESTART_SVC
bo BASED(sysc_restart)
b BASED(sysc_leave) # out of here, do NOT recheck
@@ -258,13 +296,14 @@
#
sysc_restart:
ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
- stosm 24(%r15),0x03 # reenable interrupts
l %r7,SP_R2(%r15) # load new svc number
sla %r7,2
mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
lm %r2,%r6,SP_R2(%r15) # load svc arguments
b BASED(sysc_do_restart) # restart svc

+__critical_end:
+
#
# call trace before and after sys_call
#
@@ -277,7 +316,7 @@
bnl BASED(sysc_tracenogo)
l %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
- l %r8,sys_call_table-entry_base(%r7,%r13)
+ l %r8,sys_call_table-system_call(%r7,%r13)
sysc_tracego:
lm %r3,%r6,SP_R3(%r15)
l %r2,SP_ORIG_R2(%r15)
@@ -294,13 +333,13 @@
# a new process exits the kernel with ret_from_fork
#
.globl ret_from_fork
-ret_from_fork:
- basr %r13,0
- l %r13,.Lentry_base-.(%r13) # setup base pointer to &entry_base
+ret_from_fork:
+ l %r13,__LC_SVC_NEW_PSW+4
GET_THREAD_INFO # load pointer to task_struct to R9
l %r1,BASED(.Lschedtail)
- la %r14,BASED(sysc_return)
- br %r1 # call schedule_tail, return to sysc_return
+ basr %r14,%r1
+ stosm 24(%r15),0x03 # reenable interrupts
+ b BASED(sysc_return)

#
# clone, fork, vfork, exec and sigreturn need glue,
@@ -373,12 +412,6 @@
br %r1 # branch to sys_sigreturn


-#define SYSCALL(esa,esame,emu) .long esa
- .globl sys_call_table
-sys_call_table:
-#include "syscalls.S"
-#undef SYSCALL
-
/*
* Program check handler routine
*/
@@ -398,10 +431,10 @@
* we just ignore the PER event (FIXME: is there anything we have to do
* for LPSW?).
*/
- SAVE_ALL_BASE
+ SAVE_ALL_BASE __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
bnz BASED(pgm_per) # got per exception -> special case
- SAVE_ALL __LC_PGM_OLD_PSW,1
+ SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
l %r3,__LC_PGM_ILC # load program interruption code
la %r8,0x7f
l %r7,BASED(.Ljump_table)
@@ -430,7 +463,7 @@
# Normal per exception
#
pgm_per_std:
- SAVE_ALL __LC_PGM_OLD_PSW,1
+ SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
GET_THREAD_INFO
mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(4,%r9),__LC_PER_ADDRESS
@@ -454,7 +487,7 @@
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
- SAVE_ALL __LC_SVC_OLD_PSW,1
+ SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
lh %r7,0x8a # get svc number from lowcore
stosm 24(%r15),0x03 # reenable interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
@@ -470,7 +503,7 @@
sla %r7,2 # *4
pgm_svcstd:
tm __TI_flags+3(%r9),_TIF_SYSCALL_TRACE
- l %r8,sys_call_table-entry_base(%r7,%r13) # get system call addr.
+ l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
bo BASED(pgm_tracesys)
basr %r14,%r8 # call sys_xxxx
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
@@ -503,7 +536,7 @@
bnl BASED(pgm_svc_nogo)
l %r7,SP_R2(%r15) # strace changed the syscall
sll %r7,2
- l %r8,sys_call_table-entry_base(%r7,%r13)
+ l %r8,sys_call_table-system_call(%r7,%r13)
pgm_svc_go:
lm %r3,%r6,SP_R3(%r15)
l %r2,SP_ORIG_R2(%r15)
@@ -522,10 +555,11 @@

.globl io_int_handler
io_int_handler:
- SAVE_ALL_BASE
- SAVE_ALL __LC_IO_OLD_PSW,0
- GET_THREAD_INFO # load pointer to task_struct to R9
+ SAVE_ALL_BASE __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
+ SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
stck __LC_INT_CLOCK
+ CHECK_CRITICAL
+ GET_THREAD_INFO # load pointer to task_struct to R9
l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to standard irq handler
@@ -540,24 +574,21 @@
tm __TI_flags+3(%r9),_TIF_WORK_INT
bnz BASED(io_work) # there is work to do (signals etc.)
io_leave:
- RESTORE_ALL 0
+ RESTORE_ALL

#ifdef CONFIG_PREEMPT
io_preempt:
icm %r0,15,__TI_precount(%r9)
bnz BASED(io_leave)
-io_resume_loop:
- tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
- bno BASED(io_leave)
- mvc __TI_precount(4,%r9),BASED(.Lc_pactive)
- # hmpf, we are on the async. stack but to call schedule
- # we have to move the interrupt frame to the process stack
l %r1,SP_R15(%r15)
s %r1,BASED(.Lc_spsize)
- n %r1,BASED(.Lc0xfffffff8)
- mvc SP_PTREGS(SP_SIZE-SP_PTREGS,%r1),SP_PTREGS(%r15)
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
xc 0(4,%r1),0(%r1) # clear back chain
lr %r15,%r1
+io_resume_loop:
+ tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
+ bno BASED(io_leave)
+ mvc __TI_precount(4,%r9),BASED(.Lc_pactive)
stosm 24(%r15),0x03 # reenable interrupts
l %r1,BASED(.Lschedule)
basr %r14,%r1 # call schedule
@@ -568,18 +599,19 @@
#endif

#
-# recheck if there is more work to do
+# switch to kernel stack, then check the TIF bits
#
-io_work_loop:
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
- GET_THREAD_INFO # load pointer to task_struct to R9
- tm __TI_flags+3(%r9),_TIF_WORK_INT
- bz BASED(io_leave) # there is no work to do
+io_work:
+ l %r1,__LC_KERNEL_STACK
+ s %r1,BASED(.Lc_spsize)
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc 0(4,%r1),0(%r1) # clear back chain
+ lr %r15,%r1
#
# One of the work bits is on. Find out which one.
# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
#
-io_work:
+io_work_loop:
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bo BASED(io_reschedule)
tm __TI_flags+3(%r9),_TIF_SIGPENDING
@@ -590,10 +622,14 @@
# _TIF_NEED_RESCHED is set, call schedule
#
io_reschedule:
- stosm 24(%r15),0x03 # reenable interrupts
l %r1,BASED(.Lschedule)
- la %r14,BASED(io_work_loop)
- br %r1 # call scheduler
+ stosm 24(%r15),0x03 # reenable interrupts
+ basr %r14,%r1 # call scheduler
+ stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
+ GET_THREAD_INFO # load pointer to task_struct to R9
+ tm __TI_flags+3(%r9),_TIF_WORK_INT
+ bz BASED(io_leave) # there is no work to do
+ b BASED(io_work_loop)

#
# _TIF_SIGPENDING is set, call do_signal
@@ -613,10 +649,11 @@

.globl ext_int_handler
ext_int_handler:
- SAVE_ALL_BASE
- SAVE_ALL __LC_EXT_OLD_PSW,0
- GET_THREAD_INFO # load pointer to task_struct to R9
+ SAVE_ALL_BASE __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
+ SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
stck __LC_INT_CLOCK
+ CHECK_CRITICAL
+ GET_THREAD_INFO # load pointer to task_struct to R9
la %r2,SP_PTREGS(%r15) # address of register-save area
lh %r3,__LC_EXT_INT_CODE # get interruption code
l %r1,BASED(.Ldo_extint)
@@ -629,12 +666,12 @@

.globl mcck_int_handler
mcck_int_handler:
- SAVE_ALL_BASE
- SAVE_ALL __LC_MCK_OLD_PSW,0
+ SAVE_ALL_BASE __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
+ SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
l %r1,BASED(.Ls390_mcck)
basr %r14,%r1 # call machine check handler
mcck_return:
- RESTORE_ALL 0
+ RESTORE_ALL

#ifdef CONFIG_SMP
/*
@@ -667,24 +704,65 @@
restart_go:
#endif

+cleanup_table:
+ .long system_call, sysc_enter, cleanup_sysc_enter
+ .long sysc_return, sysc_leave, cleanup_sysc_return
+ .long sysc_leave, sysc_work_loop, cleanup_sysc_leave
+ .long sysc_work_loop, sysc_reschedule, cleanup_sysc_return
+cleanup_table_entries=(.-cleanup_table) / 12
+
+cleanup_critical:
+ lhi %r0,cleanup_table_entries
+ la %r1,BASED(cleanup_table)
+ l %r2,SP_PSW+4(%r15)
+ la %r2,0(%r2)
+cleanup_loop:
+ cl %r2,0(%r1)
+ bl BASED(cleanup_cont)
+ cl %r2,4(%r1)
+ bl BASED(cleanup_found)
+cleanup_cont:
+ la %r1,12(%r1)
+ bct %r0,BASED(cleanup_loop)
+ br %r14
+cleanup_found:
+ l %r1,8(%r1)
+ br %r1
+
+cleanup_sysc_enter:
+ CLEANUP_SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ lh %r0,0x8a
+ st %r0,SP_R7(%r15)
+ la %r1,BASED(sysc_enter)
+ o %r1,BASED(.Lamode)
+ st %r1,SP_PSW+4(%r15)
+ br %r14
+
+cleanup_sysc_return:
+ la %r1,BASED(sysc_return)
+ o %r1,BASED(.Lamode)
+ st %r1,SP_PSW+4(%r15)
+ br %r14
+
+cleanup_sysc_leave:
+ CLEANUP_RESTORE_ALL
+ br %r14
+
/*
* Integer constants
*/
.align 4
-.Lc0xfffffff8: .long -8 # to align stack pointer to 8
-.Lc0xffffe000: .long -8192 # to round stack pointer to &task_struct
.Lc_spsize: .long SP_SIZE
.Lc_overhead: .long STACK_FRAME_OVERHEAD
-.Lc_ac: .long 0,0,1
-.Lc_ENOSYS: .long -ENOSYS
.Lc_pactive: .long PREEMPT_ACTIVE
-.Lc0xff: .long 0xff
.Lnr_syscalls: .long NR_syscalls
-.L0x018: .word 0x018
-.L0x020: .word 0x020
-.L0x028: .word 0x028
-.L0x030: .word 0x030
-.L0x038: .word 0x038
+.L0x018: .long 0x018
+.L0x020: .long 0x020
+.L0x028: .long 0x028
+.L0x030: .long 0x030
+.L0x038: .long 0x038
+.Lamode: .long 0x80000000

/*
* Symbol constants
@@ -694,8 +772,6 @@
.Ldo_extint: .long do_extint
.Ldo_signal: .long do_signal
.Ldo_softirq: .long do_softirq
-.Lentry_base: .long entry_base
-.Lext_hash: .long ext_int_hash
.Lhandle_per: .long do_debugger_trap
.Ljump_table: .long pgm_check_table
.Lschedule: .long schedule
@@ -712,4 +788,16 @@
.Lvfork: .long sys_vfork
.Lschedtail: .long schedule_tail

+.Lcritical_start:
+ .long __critical_start + 0x80000000
+.Lcritical_end:
+ .long __critical_end + 0x80000000
+.Lcleanup_critical:
+ .long cleanup_critical
+
+#define SYSCALL(esa,esame,emu) .long esa
+ .globl sys_call_table
+sys_call_table:
+#include "syscalls.S"
+#undef SYSCALL

diff -urN linux-2.6/arch/s390/kernel/entry64.S linux-2.6-s390/arch/s390/kernel/entry64.S
--- linux-2.6/arch/s390/kernel/entry64.S Fri Mar 26 18:24:53 2004
+++ linux-2.6-s390/arch/s390/kernel/entry64.S Fri Mar 26 18:25:59 2004
@@ -25,29 +25,27 @@
* The first few entries are identical to the user_regs_struct.
*/
SP_PTREGS = STACK_FRAME_OVERHEAD
-SP_PSW = STACK_FRAME_OVERHEAD + PT_PSWMASK
-SP_R0 = STACK_FRAME_OVERHEAD + PT_GPR0
-SP_R1 = STACK_FRAME_OVERHEAD + PT_GPR1
-SP_R2 = STACK_FRAME_OVERHEAD + PT_GPR2
-SP_R3 = STACK_FRAME_OVERHEAD + PT_GPR3
-SP_R4 = STACK_FRAME_OVERHEAD + PT_GPR4
-SP_R5 = STACK_FRAME_OVERHEAD + PT_GPR5
-SP_R6 = STACK_FRAME_OVERHEAD + PT_GPR6
-SP_R7 = STACK_FRAME_OVERHEAD + PT_GPR7
-SP_R8 = STACK_FRAME_OVERHEAD + PT_GPR8
-SP_R9 = STACK_FRAME_OVERHEAD + PT_GPR9
-SP_R10 = STACK_FRAME_OVERHEAD + PT_GPR10
-SP_R11 = STACK_FRAME_OVERHEAD + PT_GPR11
-SP_R12 = STACK_FRAME_OVERHEAD + PT_GPR12
-SP_R13 = STACK_FRAME_OVERHEAD + PT_GPR13
-SP_R14 = STACK_FRAME_OVERHEAD + PT_GPR14
-SP_R15 = STACK_FRAME_OVERHEAD + PT_GPR15
-SP_AREGS = STACK_FRAME_OVERHEAD + PT_ACR0
-SP_ORIG_R2 = STACK_FRAME_OVERHEAD + PT_ORIGGPR2
-/* Now the additional entries */
-SP_ILC = (SP_ORIG_R2+GPR_SIZE)
-SP_TRAP = (SP_ILC+2)
-SP_SIZE = (SP_TRAP+2)
+SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
+SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
+SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
+SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
+SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
+SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
+SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
+SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
+SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
+SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64
+SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72
+SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80
+SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88
+SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96
+SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104
+SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112
+SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120
+SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
+SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
+SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
+SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE

_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_RESTART_SVC)
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
@@ -60,51 +58,100 @@
* R15 - kernel stack pointer
*/

- .macro SAVE_ALL psworg,sync # system entry macro
- stmg %r14,%r15,__LC_SAVE_AREA
- stam %a2,%a4,__LC_SAVE_AREA+16
- larl %r14,.Lconst
- tm \psworg+1,0x01 # test problem state bit
+ .macro SAVE_ALL psworg,savearea,sync
+ stmg %r13,%r15,\savearea
.if \sync
+ tm \psworg+1,0x01 # test problem state bit
jz 1f # skip stack setup save
+ lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
.else
+ tm \psworg+1,0x01 # test problem state bit
jnz 0f # from user -> load kernel stack
lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
slgr %r14,%r15
srag %r14,%r14,14
- larl %r14,.Lconst
jz 1f
- lg %r15,__LC_ASYNC_STACK # load async. stack
- j 1f
+0: lg %r15,__LC_ASYNC_STACK # load async stack
.endif
-0: lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
- lam %a2,%a4,.Lc_ac-.Lconst(%r14)
1: aghi %r15,-SP_SIZE # make room for registers & psw
- nill %r15,0xfff8 # align stack pointer to 8
- stmg %r0,%r13,SP_R0(%r15) # store gprs 0-13 to kernel stack
+ lghi %r14,\psworg
+ slgr %r13,%r13
+ icm %r14,12,__LC_SVC_ILC
+ stmg %r0,%r12,SP_R0(%r15) # store gprs 0-13 to kernel stack
stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
- mvc SP_R14(16,%r15),__LC_SAVE_AREA # move r14 and r15 to stack
- stam %a0,%a15,SP_AREGS(%r15) # store access registers to kst.
- mvc SP_AREGS+8(12,%r15),__LC_SAVE_AREA+16 # store ac. regs
+ mvc SP_R13(24,%r15),\savearea # move r13, r14 and r15 to stack
mvc SP_PSW(16,%r15),\psworg # move user PSW to stack
- mvc SP_ILC(2,%r15),__LC_SVC_ILC # store instruction length
- mvc SP_TRAP(2,%r15),.L\psworg-.Lconst(%r14) # store trap ind.
- xc 0(8,%r15),0(%r15) # clear back chain
+ st %r14,SP_ILC(%r15)
+ stg %r13,0(%r15)
.endm

- .macro RESTORE_ALL sync # system exit macro
+ .macro CLEANUP_SAVE_ALL psworg,savearea,sync
+ lg %r1,SP_PSW+8(%r15)
+ cli 1(%r1),0xdf
+ jne 2f
+ mvc \savearea(24),SP_R13(%r15)
+2: lg %r1,\savearea+16
+ .if \sync
+ tm \psworg+1,0x01
+ jz 1f
+ lg %r1,__LC_KERNEL_STACK
+ .else
+ tm \psworg+1,0x01
+ jnz 0f
+ lg %r0,__LC_ASYNC_STACK
+ slgr %r0,%r1
+ srag %r0,%r0,14
+ jz 1f
+0: lg %r1,__LC_ASYNC_STACK
+ .endif
+1: aghi %r1,-SP_SIZE
+ stg %r1,SP_R15(%r15)
+ lghi %r0,\psworg
+ xc SP_R13(8,%r15),SP_R13(%r15)
+ icm %r0,12,__LC_SVC_ILC
+ stg %r0,SP_R14(%r15)
+ mvc SP_R0(104,%r1),SP_R0(%r15)
+ mvc SP_ORIG_R2(8,%r1),SP_R2(%r15)
+ mvc SP_R13(24,%r1),\savearea
+ mvc SP_PSW(16,%r1),\psworg
+ st %r0,SP_ILC(%r1)
+ xc 0(8,%r1),0(%r1)
+ .endm
+
+ .macro RESTORE_ALL # system exit macro
mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore
- lam %a0,%a15,SP_AREGS(%r15) # load the access registers
- lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
+ lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
lpswe __LC_RETURN_PSW # back to caller
.endm

+ .macro CLEANUP_RESTORE_ALL
+ lg %r1,SP_PSW+8(%r15)
+ cli 0(%r1),0xb2
+ jne 0f
+ mvc SP_PSW(16,%r15),__LC_RETURN_PSW
+ j 1f
+0: lg %r1,SP_R15(%r15)
+ mvc SP_PSW(16,%r15),SP_PSW(%r1)
+ mvc SP_R0(128,%r15),SP_R0(%r1)
+1:
+ .endm
+
.macro GET_THREAD_INFO
- lg %r9,__LC_KERNEL_STACK # load pointer to task_struct to %r9
- aghi %r9,-16384
+ lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
.endm

+ .macro CHECK_CRITICAL
+ tm SP_PSW+1(%r15),0x01 # test problem state bit
+ jnz 0f # from user -> not critical
+ larl %r1,.Lcritical_start
+ clc SP_PSW+8(8,%r15),8(%r1) # compare ip with __critical_end
+ jnl 0f
+ clc SP_PSW+8(8,%r15),0(%r1) # compare ip with __critical_start
+ jl 0f
+ brasl %r14,cleanup_critical
+0:
+ .endm

/*
* Scheduler resume function, called by switch_to
@@ -125,13 +172,10 @@
stmg %r6,%r15,48(%r15) # store __switch_to registers of prev task
stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
- stam %a2,%a2,__THREAD_ar2(%r2) # store kernel access reg. 2
- stam %a4,%a4,__THREAD_ar4(%r2) # store kernel access reg. 4
- lam %a2,%a2,__THREAD_ar2(%r3) # load kernel access reg. 2
- lam %a4,%a4,__THREAD_ar4(%r3) # load kernel access reg. 4
lmg %r6,%r15,48(%r15) # load __switch_to registers of next task
stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
lg %r3,__THREAD_info(%r3) # load thread_info from task struct
+ stg %r3,__LC_THREAD_INFO
aghi %r3,16384
stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
br %r14
@@ -154,7 +198,8 @@
brasl %r14,do_softirq
lmg %r12,%r15,48(%r12)
br %r14
-
+
+__critical_start:
/*
* SVC interrupt handler routine. System calls are synchronous events and
* are executed with interrupts enabled.
@@ -162,14 +207,15 @@

.globl system_call
system_call:
- SAVE_ALL __LC_SVC_OLD_PSW,1
+ SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
- stosm 48(%r15),0x03 # reenable interrupts
+sysc_enter:
GET_THREAD_INFO # load pointer to task_struct to R9
slag %r7,%r7,2 # *4 and test for svc 0
jnz sysc_do_restart
# svc 0: system call number in %r1
- cl %r1,.Lnr_syscalls-.Lconst(%r14)
+ lghi %r0,NR_syscalls
+ clr %r1,%r0
jnl sysc_do_restart
lgfr %r7,%r1 # clear high word in r1
slag %r7,%r7,2 # svc 0: system call number in %r1
@@ -190,19 +236,17 @@
# changing anything here !!

sysc_return:
- stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
tm SP_PSW+1(%r15),0x01 # returning to user ?
jno sysc_leave
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jnz sysc_work # there is work to do (signals etc.)
sysc_leave:
- RESTORE_ALL 1
+ RESTORE_ALL

#
# recheck if there is more work to do
#
sysc_work_loop:
- stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jz sysc_leave # there is no work to do
@@ -223,7 +267,6 @@
# _TIF_NEED_RESCHED is set, call schedule
#
sysc_reschedule:
- stosm 48(%r15),0x03 # reenable interrupts
larl %r14,sysc_work_loop
jg schedule # return point is sysc_return

@@ -231,11 +274,9 @@
# _TIF_SIGPENDING is set, call do_signal
#
sysc_sigpending:
- stosm 48(%r15),0x03 # reenable interrupts
la %r2,SP_PTREGS(%r15) # load pt_regs
sgr %r3,%r3 # clear *oldset
brasl %r14,do_signal # call do_signal
- stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
tm __TI_flags+7(%r9),_TIF_RESTART_SVC
jo sysc_restart
j sysc_leave # out of here, do NOT recheck
@@ -245,13 +286,14 @@
#
sysc_restart:
ni __TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
- stosm 48(%r15),0x03 # reenable interrupts
lg %r7,SP_R2(%r15) # load new svc number
slag %r7,%r7,2 # *4
mvc SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
lmg %r2,%r6,SP_R2(%r15) # load svc arguments
j sysc_do_restart # restart svc

+__critical_end:
+
#
# call syscall_trace before and after system call
# special linkage: %r12 contains the return address for trace_svc
@@ -260,9 +302,9 @@
srl %r7,2
stg %r7,SP_R2(%r15)
brasl %r14,syscall_trace
- larl %r1,.Lnr_syscalls
- clc SP_R2(8,%r15),0(%r1)
- jnl sysc_tracenogo
+ lghi %r0,NR_syscalls
+ clg %r0,SP_R2(%r15)
+ jnh sysc_tracenogo
lg %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
lgf %r8,0(%r7,%r10)
@@ -283,8 +325,9 @@
.globl ret_from_fork
ret_from_fork:
GET_THREAD_INFO # load pointer to task_struct to R9
- larl %r14,sysc_return
- jg schedule_tail # return to sysc_return
+ brasl %r14,schedule_tail
+ stosm 24(%r15),0x03 # reenable interrupts
+ j sysc_return

#
# clone, fork, vfork, exec and sigreturn need glue,
@@ -405,21 +448,6 @@
jg sys32_sigaltstack_wrapper # branch to sys_sigreturn
#endif

-#define SYSCALL(esa,esame,emu) .long esame
- .globl sys_call_table
-sys_call_table:
-#include "syscalls.S"
-#undef SYSCALL
-
-#ifdef CONFIG_S390_SUPPORT
-
-#define SYSCALL(esa,esame,emu) .long emu
- .globl sys_call_table_emu
-sys_call_table_emu:
-#include "syscalls.S"
-#undef SYSCALL
-#endif
-
/*
* Program check handler routine
*/
@@ -441,7 +469,7 @@
*/
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
jnz pgm_per # got per exception -> special case
- SAVE_ALL __LC_PGM_OLD_PSW,1
+ SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
lgf %r3,__LC_PGM_ILC # load program interruption code
lghi %r8,0x7f
ngr %r8,%r3
@@ -469,7 +497,7 @@
# Normal per exception
#
pgm_per_std:
- SAVE_ALL __LC_PGM_OLD_PSW,1
+ SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
GET_THREAD_INFO
mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(8,%r9),__LC_PER_ADDRESS
@@ -492,7 +520,7 @@
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
- SAVE_ALL __LC_SVC_OLD_PSW,1
+ SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
stosm 48(%r15),0x03 # reenable interrupts
GET_THREAD_INFO # load pointer to task_struct to R9
@@ -502,7 +530,8 @@
slag %r7,%r7,2 # *4 and test for svc 0
jnz pgm_svcstd
# svc 0: system call number in %r1
- clg %r1,.Lnr_syscalls-.Lconst(%r14)
+ lghi %r0,NR_syscalls
+ clr %r1,%r0
slag %r7,%r1,2
pgm_svcstd:
larl %r10,sys_call_table
@@ -540,8 +569,9 @@
srlg %r7,%r7,2
stg %r7,SP_R2(%r15)
brasl %r14,syscall_trace
- clc SP_R2(8,%r15),.Lnr_syscalls
- jnl pgm_svc_nogo
+ lghi %r0,NR_syscalls
+ clg %r0,SP_R2(%r15)
+ jnh pgm_svc_nogo
lg %r7,SP_R2(%r15)
sllg %r7,%r7,2 # strace wants to change the syscall
lgf %r8,0(%r7,%r10)
@@ -561,9 +591,10 @@
*/
.globl io_int_handler
io_int_handler:
- SAVE_ALL __LC_IO_OLD_PSW,0
- GET_THREAD_INFO # load pointer to task_struct to R9
+ SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0
stck __LC_INT_CLOCK
+ CHECK_CRITICAL
+ GET_THREAD_INFO # load pointer to task_struct to R9
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler

@@ -577,25 +608,23 @@
tm __TI_flags+7(%r9),_TIF_WORK_INT
jnz io_work # there is work to do (signals etc.)
io_leave:
- RESTORE_ALL 0
+ RESTORE_ALL

#ifdef CONFIG_PREEMPT
io_preempt:
icm %r0,15,__TI_precount(%r9)
jnz io_leave
+ # switch to kernel stack
+ lg %r1,SP_R15(%r15)
+ aghi %r1,-SP_SIZE
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc 0(8,%r1),0(%r1) # clear back chain
+ lgr %r15,%r1
io_resume_loop:
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jno io_leave
larl %r1,.Lc_pactive
mvc __TI_precount(4,%r9),0(%r1)
- # hmpf, we are on the async. stack but to call schedule
- # we have to move the interrupt frame to the process stack
- lg %r1,SP_R15(%r15)
- aghi %r1,-SP_SIZE
- nill %r1,0xfff8
- mvc SP_PTREGS(SP_SIZE-SP_PTREGS,%r1),SP_PTREGS(%r15)
- xc 0(8,%r1),0(%r1) # clear back chain
- lgr %r15,%r1
stosm 48(%r15),0x03 # reenable interrupts
brasl %r14,schedule # call schedule
stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
@@ -605,18 +634,19 @@
#endif

#
-# recheck if there is more work to do
+# switch to kernel stack, then check TIF bits
#
-io_work_loop:
- stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
- GET_THREAD_INFO # load pointer to task_struct to R9
- tm __TI_flags+7(%r9),_TIF_WORK_INT
- jz io_leave # there is no work to do
+io_work:
+ lg %r1,__LC_KERNEL_STACK
+ aghi %r1,-SP_SIZE
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc 0(8,%r1),0(%r1) # clear back chain
+ lgr %r15,%r1
#
# One of the work bits is on. Find out which one.
# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
#
-io_work:
+io_work_loop:
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jo io_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
@@ -628,8 +658,12 @@
#
io_reschedule:
stosm 48(%r15),0x03 # reenable interrupts
- larl %r14,io_work_loop
- jg schedule # call scheduler
+ brasl %r14,schedule # call scheduler
+ stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
+ GET_THREAD_INFO # load pointer to task_struct to R9
+ tm __TI_flags+7(%r9),_TIF_WORK_INT
+ jz io_leave # there is no work to do
+ j io_work_loop

#
# _TIF_SIGPENDING is set, call do_signal
@@ -647,7 +681,8 @@
*/
.globl ext_int_handler
ext_int_handler:
- SAVE_ALL __LC_EXT_OLD_PSW,0
+ SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0
+ CHECK_CRITICAL
GET_THREAD_INFO # load pointer to task_struct to R9
stck __LC_INT_CLOCK
la %r2,SP_PTREGS(%r15) # address of register-save area
@@ -660,10 +695,10 @@
*/
.globl mcck_int_handler
mcck_int_handler:
- SAVE_ALL __LC_MCK_OLD_PSW,0
+ SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64,0
brasl %r14,s390_do_machine_check
mcck_return:
- RESTORE_ALL 0
+ RESTORE_ALL

#ifdef CONFIG_SMP
/*
@@ -694,16 +729,69 @@
restart_go:
#endif

+cleanup_table:
+ .quad system_call, sysc_enter, cleanup_sysc_enter
+ .quad sysc_return, sysc_leave, cleanup_sysc_return
+ .quad sysc_leave, sysc_work_loop, cleanup_sysc_leave
+ .quad sysc_work_loop, sysc_reschedule, cleanup_sysc_return
+cleanup_table_entries=(.-cleanup_table) / 24
+
+cleanup_critical:
+ lghi %r0,cleanup_table_entries
+ larl %r1,cleanup_table
+ lg %r2,SP_PSW+8(%r15)
+cleanup_loop:
+ clg %r2,0(%r1)
+ jl cleanup_cont
+ clg %r2,8(%r1)
+ jl cleanup_found
+cleanup_cont:
+ la %r1,24(%r1)
+ brct %r0,cleanup_loop
+ br %r14
+cleanup_found:
+ lg %r1,16(%r1)
+ br %r1
+
+cleanup_sysc_enter:
+ CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ llgh %r0,0x8a
+ stg %r0,SP_R7(%r15)
+ larl %r1,sysc_enter
+ stg %r1,SP_PSW+8(%r15)
+ br %r14
+
+cleanup_sysc_return:
+ larl %r1,sysc_return
+ stg %r1,SP_PSW+8(%r15)
+ br %r14
+
+cleanup_sysc_leave:
+ CLEANUP_RESTORE_ALL
+ br %r14
+
/*
* Integer constants
*/
.align 4
.Lconst:
-.Lc_ac: .long 0,0,1
.Lc_pactive: .long PREEMPT_ACTIVE
-.L0x0130: .word 0x0130
-.L0x0140: .word 0x0140
-.L0x0150: .word 0x0150
-.L0x0160: .word 0x0160
-.L0x0170: .word 0x0170
-.Lnr_syscalls: .long NR_syscalls
+.Lcritical_start:
+ .quad __critical_start
+.Lcritical_end:
+ .quad __critical_end
+
+#define SYSCALL(esa,esame,emu) .long esame
+ .globl sys_call_table
+sys_call_table:
+#include "syscalls.S"
+#undef SYSCALL
+
+#ifdef CONFIG_S390_SUPPORT
+
+#define SYSCALL(esa,esame,emu) .long emu
+ .globl sys_call_table_emu
+sys_call_table_emu:
+#include "syscalls.S"
+#undef SYSCALL
+#endif
diff -urN linux-2.6/arch/s390/kernel/process.c linux-2.6-s390/arch/s390/kernel/process.c
--- linux-2.6/arch/s390/kernel/process.c Fri Mar 26 18:25:13 2004
+++ linux-2.6-s390/arch/s390/kernel/process.c Fri Mar 26 18:25:59 2004
@@ -179,7 +179,7 @@
memset(&regs, 0, sizeof(regs));
regs.psw.mask = PSW_KERNEL_BITS;
regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
- regs.gprs[7] = STACK_FRAME_OVERHEAD;
+ regs.gprs[7] = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
regs.gprs[8] = __LC_KERNEL_STACK;
regs.gprs[9] = (unsigned long) fn;
regs.gprs[10] = (unsigned long) arg;
@@ -230,6 +230,7 @@
(THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
p->thread.ksp = (unsigned long) frame;
p->set_child_tid = p->clear_child_tid = NULL;
+ /* Store access registers to kernel stack of new process. */
frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
frame->childregs.gprs[15] = new_stackp;
@@ -240,6 +241,10 @@

/* fake return stack for resume(), don't go back to schedule */
frame->gprs[9] = (unsigned long) frame;
+
+ /* Save access registers to new thread structure. */
+ save_access_regs(&p->thread.acrs[0]);
+
#ifndef CONFIG_ARCH_S390X
/*
* save fprs to current->thread.fp_regs to merge them with
@@ -251,7 +256,7 @@
p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _SEGMENT_TABLE;
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS)
- frame->childregs.acrs[0] = regs->gprs[6];
+ p->thread.acrs[0] = regs->gprs[6];
#else /* CONFIG_ARCH_S390X */
/* Save the fpu registers to new thread structure. */
save_fp_regs(&p->thread.fp_regs);
@@ -259,18 +264,15 @@
/* Set a new TLS ? */
if (clone_flags & CLONE_SETTLS) {
if (test_thread_flag(TIF_31BIT)) {
- frame->childregs.acrs[0] =
- (unsigned int) regs->gprs[6];
+ p->thread.acrs[0] = (unsigned int) regs->gprs[6];
} else {
- frame->childregs.acrs[0] =
- (unsigned int)(regs->gprs[6] >> 32);
- frame->childregs.acrs[1] =
- (unsigned int) regs->gprs[6];
+ p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32);
+ p->thread.acrs[1] = (unsigned int) regs->gprs[6];
}
}
#endif /* CONFIG_ARCH_S390X */
/* start new process with ar4 pointing to the correct address space */
- p->thread.ar4 = get_fs().ar4;
+ p->thread.mm_segment = get_fs();
/* Don't copy debug registers */
memset(&p->thread.per_info,0,sizeof(p->thread.per_info));

diff -urN linux-2.6/arch/s390/kernel/ptrace.c linux-2.6-s390/arch/s390/kernel/ptrace.c
--- linux-2.6/arch/s390/kernel/ptrace.c Fri Mar 26 18:25:13 2004
+++ linux-2.6-s390/arch/s390/kernel/ptrace.c Fri Mar 26 18:25:59 2004
@@ -137,25 +137,36 @@
if ((addr & 3) || addr > sizeof(struct user) - __ADDR_MASK)
return -EIO;

- if (addr <= (addr_t) &dummy->regs.orig_gpr2) {
+ if (addr < (addr_t) &dummy->regs.acrs) {
/*
- * psw, gprs, acrs and orig_gpr2 are stored on the stack
+ * psw and gprs are stored on the stack
*/
tmp = *(addr_t *)((addr_t) __KSTK_PTREGS(child) + addr);
if (addr == (addr_t) &dummy->regs.psw.mask)
/* Remove per bit from user psw. */
tmp &= ~PSW_MASK_PER;

- } else if (addr >= (addr_t) &dummy->regs.fp_regs &&
- addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
+ } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - (addr_t) &dummy->regs.acrs;
+ tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
+
+ } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ tmp = (addr_t) __KSTK_PTREGS(child)->orig_gpr2;
+
+ } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
/*
* floating point regs. are stored in the thread structure
*/
offset = addr - (addr_t) &dummy->regs.fp_regs;
tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);

- } else if (addr >= (addr_t) &dummy->regs.per_info &&
- addr < (addr_t) (&dummy->regs.per_info + 1)) {
+ } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
* per_info is found in the thread structure
*/
@@ -187,9 +198,9 @@
if ((addr & 3) || addr > sizeof(struct user) - __ADDR_MASK)
return -EIO;

- if (addr <= (addr_t) &dummy->regs.orig_gpr2) {
+ if (addr < (addr_t) &dummy->regs.acrs) {
/*
- * psw, gprs, acrs and orig_gpr2 are stored on the stack
+ * psw and gprs are stored on the stack
*/
if (addr == (addr_t) &dummy->regs.psw.mask &&
#ifdef CONFIG_S390_SUPPORT
@@ -206,8 +217,20 @@
#endif
*(addr_t *)((addr_t) __KSTK_PTREGS(child) + addr) = data;

- } else if (addr >= (addr_t) &dummy->regs.fp_regs &&
- addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
+ } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - (addr_t) &dummy->regs.acrs;
+ *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
+
+ } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ __KSTK_PTREGS(child)->orig_gpr2 = data;
+
+ } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
/*
* floating point regs. are stored in the thread structure
*/
@@ -217,8 +240,7 @@
offset = addr - (addr_t) &dummy->regs.fp_regs;
*(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;

- } else if (addr >= (addr_t) &dummy->regs.per_info &&
- addr < (addr_t) (&dummy->regs.per_info + 1)) {
+ } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
/*
* per_info is found in the thread structure
*/
@@ -324,9 +346,9 @@
(addr & 3) || addr > sizeof(struct user) - 3)
return -EIO;

- if (addr <= (addr_t) &dummy32->regs.orig_gpr2) {
+ if (addr < (addr_t) &dummy32->regs.acrs) {
/*
- * psw, gprs, acrs and orig_gpr2 are stored on the stack
+ * psw and gprs are stored on the stack
*/
if (addr == (addr_t) &dummy32->regs.psw.mask) {
/* Fake a 31 bit psw mask. */
@@ -336,28 +358,32 @@
/* Fake a 31 bit psw address. */
tmp = (__u32) __KSTK_PTREGS(child)->psw.addr |
PSW32_ADDR_AMODE31;
- } else if (addr < (addr_t) &dummy32->regs.acrs[0]) {
+ } else {
/* gpr 0-15 */
tmp = *(__u32 *)((addr_t) __KSTK_PTREGS(child) +
addr*2 + 4);
- } else if (addr < (addr_t) &dummy32->regs.orig_gpr2) {
- offset = PT_ACR0 + addr - (addr_t) &dummy32->regs.acrs;
- tmp = *(__u32*)((addr_t) __KSTK_PTREGS(child) + offset);
- } else {
- /* orig gpr 2 */
- offset = PT_ORIGGPR2 + 4;
- tmp = *(__u32*)((addr_t) __KSTK_PTREGS(child) + offset);
}
- } else if (addr >= (addr_t) &dummy32->regs.fp_regs &&
- addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
+ } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - (addr_t) &dummy32->regs.acrs;
+ tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
+
+ } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ tmp = *(__u32*)((addr_t) &__KSTK_PTREGS(child)->orig_gpr2 + 4);
+
+ } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
/*
* floating point regs. are stored in the thread structure
*/
offset = addr - (addr_t) &dummy32->regs.fp_regs;
tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);

- } else if (addr >= (addr_t) &dummy32->regs.per_info &&
- addr < (addr_t) (&dummy32->regs.per_info + 1)) {
+ } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
* per_info is found in the thread structure
*/
@@ -396,7 +422,7 @@

tmp = (__u32) data;

- if (addr <= (addr_t) &dummy32->regs.orig_gpr2) {
+ if (addr < (addr_t) &dummy32->regs.acrs) {
/*
* psw, gprs, acrs and orig_gpr2 are stored on the stack
*/
@@ -411,19 +437,25 @@
/* Build a 64 bit psw address from 31 bit address. */
__KSTK_PTREGS(child)->psw.addr =
(__u64) tmp & PSW32_ADDR_INSN;
- } else if (addr < (addr_t) &dummy32->regs.acrs[0]) {
+ } else {
/* gpr 0-15 */
*(__u32*)((addr_t) __KSTK_PTREGS(child) + addr*2 + 4) =
tmp;
- } else if (addr < (addr_t) &dummy32->regs.orig_gpr2) {
- offset = PT_ACR0 + addr - (addr_t) &dummy32->regs.acrs;
- *(__u32*)((addr_t) __KSTK_PTREGS(child) + offset) = tmp;
- } else {
- offset = PT_ORIGGPR2 + 4;
- *(__u32*)((addr_t) __KSTK_PTREGS(child) + offset) = tmp;
}
- } else if (addr >= (addr_t) &dummy32->regs.fp_regs &&
- addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
+ } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
+ /*
+ * access registers are stored in the thread structure
+ */
+ offset = addr - (addr_t) &dummy32->regs.acrs;
+ *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
+
+ } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
+ /*
+ * orig_gpr2 is stored on the kernel stack
+ */
+ *(__u32*)((addr_t) &__KSTK_PTREGS(child)->orig_gpr2 + 4) = tmp;
+
+ } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
/*
* floating point regs. are stored in the thread structure
*/
@@ -434,8 +466,7 @@
offset = addr - (addr_t) &dummy32->regs.fp_regs;
*(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;

- } else if (addr >= (addr_t) &dummy32->regs.per_info &&
- addr < (addr_t) (&dummy32->regs.per_info + 1)) {
+ } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
/*
* per_info is found in the thread structure.
*/
diff -urN linux-2.6/arch/s390/kernel/s390_ksyms.c linux-2.6-s390/arch/s390/kernel/s390_ksyms.c
--- linux-2.6/arch/s390/kernel/s390_ksyms.c Thu Mar 11 03:55:34 2004
+++ linux-2.6-s390/arch/s390/kernel/s390_ksyms.c Fri Mar 26 18:25:59 2004
@@ -33,6 +33,8 @@
EXPORT_SYMBOL_NOVERS(__copy_from_user_asm);
EXPORT_SYMBOL_NOVERS(__copy_to_user_asm);
EXPORT_SYMBOL_NOVERS(__clear_user_asm);
+EXPORT_SYMBOL_NOVERS(__strncpy_from_user_asm);
+EXPORT_SYMBOL_NOVERS(__strnlen_user_asm);
EXPORT_SYMBOL(diag10);

/*
diff -urN linux-2.6/arch/s390/kernel/setup.c linux-2.6-s390/arch/s390/kernel/setup.c
--- linux-2.6/arch/s390/kernel/setup.c Fri Mar 26 18:25:13 2004
+++ linux-2.6-s390/arch/s390/kernel/setup.c Fri Mar 26 18:25:59 2004
@@ -496,7 +496,7 @@
lc->external_new_psw.mask = PSW_KERNEL_BITS;
lc->external_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
- lc->svc_new_psw.mask = PSW_KERNEL_BITS;
+ lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
lc->program_new_psw.mask = PSW_KERNEL_BITS;
lc->program_new_psw.addr =
@@ -512,6 +512,7 @@
lc->async_stack = (unsigned long)
__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
lc->current_task = (unsigned long) init_thread_union.thread_info.task;
+ lc->thread_info = (unsigned long) &init_thread_union;
#ifdef CONFIG_ARCH_S390X
if (MACHINE_HAS_DIAG44)
lc->diag44_opcode = 0x83000044;
diff -urN linux-2.6/arch/s390/kernel/signal.c linux-2.6-s390/arch/s390/kernel/signal.c
--- linux-2.6/arch/s390/kernel/signal.c Fri Mar 26 18:24:53 2004
+++ linux-2.6-s390/arch/s390/kernel/signal.c Fri Mar 26 18:25:59 2004
@@ -151,13 +151,20 @@
unsigned long old_mask = regs->psw.mask;
int err;

+ save_access_regs(current->thread.acrs);
+
/* Copy a 'clean' PSW mask to the user to avoid leaking
information about whether PER is currently on. */
regs->psw.mask = PSW_MASK_MERGE(PSW_USER_BITS, regs->psw.mask);
- err = __copy_to_user(&sregs->regs, regs, sizeof(_s390_regs_common));
+ err = __copy_to_user(&sregs->regs.psw, &regs->psw,
+ sizeof(sregs->regs.psw)+sizeof(sregs->regs.gprs));
regs->psw.mask = old_mask;
if (err != 0)
return err;
+ err = __copy_to_user(&sregs->regs.acrs, current->thread.acrs,
+ sizeof(sregs->regs.acrs));
+ if (err != 0)
+ return err;
/*
* We have to store the fp registers to current->thread.fp_regs
* to merge them with the emulated registers.
@@ -176,11 +183,17 @@
/* Alwys make any pending restarted system call return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;

- err = __copy_from_user(regs, &sregs->regs, sizeof(_s390_regs_common));
+ err = __copy_from_user(&regs->psw, &sregs->regs.psw,
+ sizeof(sregs->regs.psw)+sizeof(sregs->regs.gprs));
regs->psw.mask = PSW_MASK_MERGE(old_mask, regs->psw.mask);
regs->psw.addr |= PSW_ADDR_AMODE;
if (err)
return err;
+ err = __copy_from_user(&current->thread.acrs, &sregs->regs.acrs,
+ sizeof(sregs->regs.acrs));
+ if (err)
+ return err;
+ restore_access_regs(current->thread.acrs);

err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
sizeof(s390_fp_regs));
diff -urN linux-2.6/arch/s390/kernel/traps.c linux-2.6-s390/arch/s390/kernel/traps.c
--- linux-2.6/arch/s390/kernel/traps.c Fri Mar 26 18:24:53 2004
+++ linux-2.6-s390/arch/s390/kernel/traps.c Fri Mar 26 18:25:59 2004
@@ -173,6 +173,10 @@
printk(" " FOURLONG,
regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);

+#if 0
+ /* FIXME: this isn't needed any more but it changes the ksymoops
+ * input. To remove or not to remove ... */
+ save_access_regs(regs->acrs);
printk("%s ACRS: %08x %08x %08x %08x\n", mode,
regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
printk(" %08x %08x %08x %08x\n",
@@ -181,6 +185,7 @@
regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
printk(" %08x %08x %08x %08x\n",
regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
+#endif

/*
* Print the first 20 byte of the instruction stream at the
@@ -229,17 +234,17 @@
regs->gprs[12], regs->gprs[13],
regs->gprs[14], regs->gprs[15]);
buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
- regs->acrs[0], regs->acrs[1],
- regs->acrs[2], regs->acrs[3]);
+ task->thread.acrs[0], task->thread.acrs[1],
+ task->thread.acrs[2], task->thread.acrs[3]);
buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
- regs->acrs[4], regs->acrs[5],
- regs->acrs[6], regs->acrs[7]);
+ task->thread.acrs[4], task->thread.acrs[5],
+ task->thread.acrs[6], task->thread.acrs[7]);
buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
- regs->acrs[8], regs->acrs[9],
- regs->acrs[10], regs->acrs[11]);
+ task->thread.acrs[8], task->thread.acrs[9],
+ task->thread.acrs[10], task->thread.acrs[11]);
buffer += sprintf(buffer, " %08x %08x %08x %08x\n",
- regs->acrs[12], regs->acrs[13],
- regs->acrs[14], regs->acrs[15]);
+ task->thread.acrs[12], task->thread.acrs[13],
+ task->thread.acrs[14], task->thread.acrs[15]);
return buffer;
}

diff -urN linux-2.6/arch/s390/lib/uaccess.S linux-2.6-s390/arch/s390/lib/uaccess.S
--- linux-2.6/arch/s390/lib/uaccess.S Thu Mar 11 03:55:36 2004
+++ linux-2.6-s390/arch/s390/lib/uaccess.S Fri Mar 26 18:25:59 2004
@@ -9,135 +9,191 @@
* These functions have standard call interface
*/

+#include <linux/errno.h>
#include <asm/lowcore.h>
+#include <asm/offsets.h>

.text
.align 4
.globl __copy_from_user_asm
+ # %r2 = to, %r3 = n, %r4 = from
__copy_from_user_asm:
- lr %r5,%r3
- sacf 512
-0: mvcle %r2,%r4,0
- jo 0b
-1: sacf 0
- lr %r2,%r5
- br %r14
-2: lhi %r1,-4096
- lr %r3,%r4
- slr %r3,%r1 # %r3 = %r4 + 4096
- nr %r3,%r1 # %r3 = (%r4 + 4096) & -4096
- slr %r3,%r4 # %r3 = #bytes to next user page boundary
- clr %r5,%r3 # copy crosses next page boundary ?
- jnh 1b # no, this page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r2,%r4,0
- jo 3b
- j 1b
+ slr %r0,%r0
+0: mvcp 0(%r3,%r2),0(%r4),%r0
+ jnz 1f
+ slr %r2,%r2
+ br %r14
+1: la %r2,256(%r2)
+ la %r4,256(%r4)
+ ahi %r3,-256
+2: mvcp 0(%r3,%r2),0(%r4),%r0
+ jnz 1b
+3: slr %r2,%r2
+ br %r14
+4: lhi %r0,-4096
+ lr %r5,%r4
+ slr %r5,%r0
+ nr %r5,%r0 # %r5 = (%r4 + 4096) & -4096
+ slr %r5,%r4 # %r5 = #bytes to next user page boundary
+ clr %r3,%r5 # copy crosses next page boundary ?
+ jnh 6f # no, the current page faulted
+ # move with the reduced length which is < 256
+5: mvcp 0(%r5,%r2),0(%r4),%r0
+ slr %r3,%r5
+6: lr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .long 0b,2b
- .long 3b,1b
+ .long 0b,4b
+ .long 2b,4b
+ .long 5b,6b
.previous

.align 4
.text
.globl __copy_to_user_asm
+ # %r2 = from, %r3 = n, %r4 = to
__copy_to_user_asm:
- lr %r5,%r3
- sacf 512
-0: mvcle %r4,%r2,0
- jo 0b
-1: sacf 0
- lr %r2,%r3
+ slr %r0,%r0
+0: mvcs 0(%r3,%r4),0(%r2),%r0
+ jnz 1f
+ slr %r2,%r2
+ br %r14
+1: la %r2,256(%r2)
+ la %r4,256(%r4)
+ ahi %r3,-256
+2: mvcs 0(%r3,%r4),0(%r2),%r0
+ jnz 1b
+3: slr %r2,%r2
br %r14
-2: lhi %r1,-4096
+4: lhi %r0,-4096
lr %r5,%r4
- slr %r5,%r1 # %r5 = %r4 + 4096
- nr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slr %r5,%r4 # %r5 = #bytes to next user page boundary
- clr %r3,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r4,%r2,0
- jo 3b
- j 1b
+ slr %r5,%r0
+ nr %r5,%r0 # %r5 = (%r4 + 4096) & -4096
+ slr %r5,%r4 # %r5 = #bytes to next user page boundary
+ clr %r3,%r5 # copy crosses next page boundary ?
+ jnh 6f # no, the current page faulted
+ # move with the reduced length which is < 256
+5: mvcs 0(%r5,%r4),0(%r2),%r0
+ slr %r3,%r5
+6: lr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .long 0b,2b
- .long 3b,1b
+ .long 0b,4b
+ .long 2b,4b
+ .long 5b,6b
.previous

.align 4
.text
.globl __copy_in_user_asm
+ # %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
- stm %r6,%r15,24(%r15)
- lr %r5,%r3
- lr %r7,%r3
- lr %r6,%r2
- cpya 6,4 # ar6 = ar4
- sacf 512
-0: mvcle %r4,%r6,0
- jo 0b
-1: sacf 0
- lr %r2,%r7
- lm %r6,%r15,24(%r15)
+ sacf 256
+ bras 1,1f
+ mvc 0(1,%r4),0(%r2)
+0: mvc 0(256,%r4),0(%r2)
+ la %r2,256(%r2)
+ la %r4,256(%r4)
+1: ahi %r3,-256
+ jnm 0b
+2: ex %r3,0(%r1)
+ sacf 0
+ slr %r2,%r2
+ br 14
+3: mvc 0(1,%r4),0(%r2)
+ la %r2,1(%r2)
+ la %r4,1(%r4)
+ ahi %r3,-1
+ jnm 3b
+4: lr %r2,%r3
+ sacf 0
br %r14
-2: lhi %r1,-4096
- lr %r5,%r4
- slr %r5,%r1 # %r5 = %r4 + 4096
- nr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slr %r5,%r4 # %r5 = #bytes to next user page boundary
- clr %r7,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r4,%r6,0
- jo 3b
- j 1b
.section __ex_table,"a"
- .long 0b,2b
- .long 3b,1b
+ .long 0b,3b
+ .long 2b,3b
+ .long 3b,4b
.previous
-
+
.align 4
.text
.globl __clear_user_asm
+ # %r2 = to, %r3 = n
__clear_user_asm:
+ bras %r5,0f
+ .long empty_zero_page
+0: l %r5,0(%r5)
+ slr %r0,%r0
+1: mvcs 0(%r3,%r2),0(%r5),%r0
+ jnz 2f
+ slr %r2,%r2
+ br %r14
+2: la %r2,256(%r2)
+ ahi %r3,-256
+3: mvcs 0(%r3,%r2),0(%r5),%r0
+ jnz 2b
+4: slr %r2,%r2
+ br %r14
+5: lhi %r0,-4096
lr %r4,%r2
- lr %r5,%r3
- sr %r2,%r2
- sr %r3,%r3
- sacf 512
-0: mvcle %r4,%r2,0
- jo 0b
-1: sacf 0
- br %r14
-2: lr %r2,%r5
- lhi %r1,-4096
- slr %r5,%r1 # %r5 = %r4 + 4096
- nr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slr %r5,%r4 # %r5 = #bytes to next user page boundary
- clr %r2,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
- slr %r2,%r5
-3: mvcle %r4,%r2,0
- jo 3b
- j 1b
-4: alr %r2,%r5
- j 1b
+ slr %r4,%r0
+ nr %r4,%r0 # %r4 = (%r2 + 4096) & -4096
+ slr %r4,%r2 # %r4 = #bytes to next user page boundary
+ clr %r3,%r4 # clear crosses next page boundary ?
+ jnh 7f # no, the current page faulted
+ # clear with the reduced length which is < 256
+6: mvcs 0(%r4,%r2),0(%r5),%r0
+ slr %r3,%r4
+7: lr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .long 0b,2b
- .long 3b,4b
+ .long 1b,5b
+ .long 3b,5b
+ .long 6b,7b
.previous

+ .align 4
+ .text
+ .globl __strncpy_from_user_asm
+ # %r2 = dst, %r3 = src, %r4 = count
+__strncpy_from_user_asm:
+ lhi %r0,0
+ lhi %r1,1
+ lhi %r5,0
+0: mvcp 0(%r1,%r2),0(%r3),%r0
+ tm 0(%r2),0xff
+ jz 1f
+ la %r2,1(%r2)
+ la %r3,1(%r3)
+ ahi %r5,1
+ clr %r5,%r4
+ jl 0b
+1: lr %r2,%r5
+ br %r14
+2: lhi %r2,-EFAULT
+ br %r14
+ .section __ex_table,"a"
+ .long 0b,2b
+ .previous
+
+ .align 4
+ .text
+ .globl __strnlen_user_asm
+ # %r2 = src, %r3 = count
+__strnlen_user_asm:
+ lhi %r0,0
+ lhi %r1,1
+ lhi %r5,0
+0: mvcp 24(%r1,%r15),0(%r2),%r0
+ ahi %r5,1
+ tm 24(%r15),0xff
+ jz 1f
+ la %r2,1(%r2)
+ clr %r5,%r3
+ jl 0b
+1: lr %r2,%r5
+ br %r14
+2: lhi %r2,-EFAULT
+ br %r14
+ .section __ex_table,"a"
+ .long 0b,2b
+ .previous
diff -urN linux-2.6/arch/s390/lib/uaccess64.S linux-2.6-s390/arch/s390/lib/uaccess64.S
--- linux-2.6/arch/s390/lib/uaccess64.S Thu Mar 11 03:55:43 2004
+++ linux-2.6-s390/arch/s390/lib/uaccess64.S Fri Mar 26 18:25:59 2004
@@ -9,134 +9,189 @@
* These functions have standard call interface
*/

+#include <linux/errno.h>
#include <asm/lowcore.h>
+#include <asm/offsets.h>

.text
.align 4
.globl __copy_from_user_asm
+ # %r2 = to, %r3 = n, %r4 = from
__copy_from_user_asm:
- lgr %r5,%r3
- sacf 512
-0: mvcle %r2,%r4,0
- jo 0b
-1: sacf 0
- lgr %r2,%r5
- br %r14
-2: lghi %r1,-4096
- lgr %r3,%r4
- slgr %r3,%r1 # %r3 = %r4 + 4096
- ngr %r3,%r1 # %r3 = (%r4 + 4096) & -4096
- slgr %r3,%r4 # %r3 = #bytes to next user page boundary
- clgr %r5,%r3 # copy crosses next page boundary ?
- jnh 1b # no, this page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r2,%r4,0
- jo 3b
- j 1b
+ slgr %r0,%r0
+0: mvcp 0(%r3,%r2),0(%r4),%r0
+ jnz 1f
+ slgr %r2,%r2
+ br %r14
+1: la %r2,256(%r2)
+ la %r4,256(%r4)
+ aghi %r3,-256
+2: mvcp 0(%r3,%r2),0(%r4),%r0
+ jnz 1b
+3: slgr %r2,%r2
+ br %r14
+4: lghi %r0,-4096
+ lgr %r5,%r4
+ slgr %r5,%r0
+ ngr %r5,%r0 # %r5 = (%r4 + 4096) & -4096
+ slgr %r5,%r4 # %r5 = #bytes to next user page boundary
+ clgr %r3,%r5 # copy crosses next page boundary ?
+ jnh 6f # no, the current page faulted
+ # move with the reduced length which is < 256
+5: mvcp 0(%r5,%r2),0(%r4),%r0
+ slgr %r3,%r5
+6: lgr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .quad 0b,2b
- .quad 3b,1b
+ .quad 0b,4b
+ .quad 2b,4b
+ .quad 5b,6b
.previous

.align 4
.text
.globl __copy_to_user_asm
+ # %r2 = from, %r3 = n, %r4 = to
__copy_to_user_asm:
- lgr %r5,%r3
- sacf 512
-0: mvcle %r4,%r2,0
- jo 0b
-1: sacf 0
- lgr %r2,%r3
+ slgr %r0,%r0
+0: mvcs 0(%r3,%r4),0(%r2),%r0
+ jnz 1f
+ slgr %r2,%r2
+ br %r14
+1: la %r2,256(%r2)
+ la %r4,256(%r4)
+ aghi %r3,-256
+2: mvcs 0(%r3,%r4),0(%r2),%r0
+ jnz 1b
+3: slgr %r2,%r2
br %r14
-2: lghi %r1,-4096
+4: lghi %r0,-4096
lgr %r5,%r4
- slgr %r5,%r1 # %r5 = %r4 + 4096
- ngr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slgr %r5,%r4 # %r5 = #bytes to next user page boundary
- clgr %r3,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r4,%r2,0
- jo 3b
- j 1b
+ slgr %r5,%r0
+ ngr %r5,%r0 # %r5 = (%r4 + 4096) & -4096
+ slgr %r5,%r4 # %r5 = #bytes to next user page boundary
+ clgr %r3,%r5 # copy crosses next page boundary ?
+ jnh 6f # no, the current page faulted
+ # move with the reduced length which is < 256
+5: mvcs 0(%r5,%r4),0(%r2),%r0
+ slgr %r3,%r5
+6: lgr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .quad 0b,2b
- .quad 3b,1b
+ .quad 0b,4b
+ .quad 2b,4b
+ .quad 5b,6b
.previous

.align 4
.text
.globl __copy_in_user_asm
+ # %r2 = from, %r3 = n, %r4 = to
__copy_in_user_asm:
- stmg %r6,%r15,48(%r15)
- lgr %r5,%r3
- lgr %r7,%r5
- lgr %r6,%r2
- cpya 6,4 # ar6 = ar4
- sacf 512
-0: mvcle %r4,%r6,0
- jo 0b
-1: sacf 0
- lgr %r2,%r7
- lmg %r6,%r15,48(%r15)
+ sacf 256
+ bras 1,1f
+ mvc 0(1,%r4),0(%r2)
+0: mvc 0(256,%r4),0(%r2)
+ la %r2,256(%r2)
+ la %r4,256(%r4)
+1: aghi %r3,-256
+ jnm 0b
+2: ex %r3,0(%r1)
+ sacf 0
+ slgr %r2,%r2
+ br 14
+3: mvc 0(1,%r4),0(%r2)
+ la %r2,1(%r2)
+ la %r4,1(%r4)
+ aghi %r3,-1
+ jnm 3b
+4: lgr %r2,%r3
+ sacf 0
br %r14
-2: lghi %r1,-4096
- lgr %r5,%r4
- slgr %r5,%r1 # %r5 = %r4 + 4096
- ngr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slgr %r5,%r4 # %r5 = #bytes to next user page boundary
- clgr %r7,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
-3: mvcle %r4,%r6,0
- jo 3b
- j 1b
.section __ex_table,"a"
- .quad 0b,2b
- .quad 3b,1b
+ .quad 0b,3b
+ .quad 2b,3b
+ .quad 3b,4b
.previous
-
+
.align 4
.text
.globl __clear_user_asm
+ # %r2 = to, %r3 = n
__clear_user_asm:
+ slgr %r0,%r0
+ larl %r5,empty_zero_page
+1: mvcs 0(%r3,%r2),0(%r5),%r0
+ jnz 2f
+ slgr %r2,%r2
+ br %r14
+2: la %r2,256(%r2)
+ aghi %r3,-256
+3: mvcs 0(%r3,%r2),0(%r5),%r0
+ jnz 2b
+4: slgr %r2,%r2
+ br %r14
+5: lghi %r0,-4096
lgr %r4,%r2
- lgr %r5,%r3
- sgr %r2,%r2
- sgr %r3,%r3
- sacf 512
-0: mvcle %r4,%r2,0
- jo 0b
-1: sacf 0
- br %r14
-2: lgr %r2,%r5
- lghi %r1,-4096
- slgr %r5,%r1 # %r5 = %r4 + 4096
- ngr %r5,%r1 # %r5 = (%r4 + 4096) & -4096
- slgr %r5,%r4 # %r5 = #bytes to next user page boundary
- clgr %r2,%r5 # copy crosses next page boundary ?
- jnh 1b # no, the current page fauled
- # The page after the current user page might have faulted.
- # We cant't find out which page because the program check handler
- # might have callled schedule, destroying all lowcore information.
- # We retry with the shortened length.
- slgr %r2,%r5
-3: mvcle %r4,%r2,0
- jo 3b
- j 1b
-4: algr %r2,%r5
- j 1b
+ slgr %r4,%r0
+ ngr %r4,%r0 # %r4 = (%r2 + 4096) & -4096
+ slgr %r4,%r2 # %r4 = #bytes to next user page boundary
+ clgr %r3,%r4 # clear crosses next page boundary ?
+ jnh 7f # no, the current page faulted
+ # clear with the reduced length which is < 256
+6: mvcs 0(%r4,%r2),0(%r5),%r0
+ slgr %r3,%r4
+7: lgr %r2,%r3
+ br %r14
.section __ex_table,"a"
- .quad 0b,2b
- .quad 3b,4b
+ .quad 1b,5b
+ .quad 3b,5b
+ .quad 6b,7b
.previous
+
+ .align 4
+ .text
+ .globl __strncpy_from_user_asm
+ # %r2 = dst, %r3 = src, %r4 = count
+__strncpy_from_user_asm:
+ lghi %r0,0
+ lghi %r1,1
+ lghi %r5,0
+0: mvcp 0(%r1,%r2),0(%r3),%r0
+ tm 0(%r2),0xff
+ jz 1f
+ la %r2,1(%r2)
+ la %r3,1(%r3)
+ aghi %r5,1
+ clgr %r5,%r4
+ jl 0b
+1: lgr %r2,%r5
+ br %r14
+2: lghi %r2,-EFAULT
+ br %r14
+ .section __ex_table,"a"
+ .quad 0b,2b
+ .previous
+
+ .align 4
+ .text
+ .globl __strnlen_user_asm
+ # %r2 = src, %r3 = count
+__strnlen_user_asm:
+ lghi %r0,0
+ lghi %r1,1
+ lghi %r5,0
+0: mvcp 24(%r1,%r15),0(%r2),%r0
+ aghi %r5,1
+ tm 24(%r15),0xff
+ jz 1f
+ la %r2,1(%r2)
+ clgr %r5,%r3
+ jl 0b
+1: lgr %r2,%r5
+ br %r14
+2: lghi %r2,-EFAULT
+ br %r14
+ .section __ex_table,"a"
+ .quad 0b,2b
+ .previous
diff -urN linux-2.6/arch/s390/mm/fault.c linux-2.6-s390/arch/s390/mm/fault.c
--- linux-2.6/arch/s390/mm/fault.c Thu Mar 11 03:55:37 2004
+++ linux-2.6-s390/arch/s390/mm/fault.c Fri Mar 26 18:25:59 2004
@@ -87,12 +87,12 @@
if (areg == 0)
/* Access via access register 0 -> kernel address */
return 0;
- if (regs && areg < NUM_ACRS && regs->acrs[areg] <= 1)
+ if (regs && areg < NUM_ACRS && current->thread.acrs[areg] <= 1)
/*
* access register contains 0 -> kernel address,
* access register contains 1 -> user space address
*/
- return regs->acrs[areg];
+ return current->thread.acrs[areg];

/* Something unhealthy was done with the access registers... */
die("page fault via unknown access register", regs, error_code);
@@ -115,8 +115,10 @@
* 3: Home Segment Table Descriptor
*/
int descriptor = S390_lowcore.trans_exc_code & 3;
- if (descriptor == 1)
+ if (descriptor == 1) {
+ save_access_regs(current->thread.acrs);
return __check_access_register(regs, error_code);
+ }
return descriptor >> 1;
}

diff -urN linux-2.6/arch/s390/mm/init.c linux-2.6-s390/arch/s390/mm/init.c
--- linux-2.6/arch/s390/mm/init.c Thu Mar 11 03:55:37 2004
+++ linux-2.6-s390/arch/s390/mm/init.c Fri Mar 26 18:25:59 2004
@@ -138,6 +138,8 @@
}
}

+ S390_lowcore.kernel_asce = pgdir_k;
+
/* enable virtual mapping in kernel mode */
__asm__ __volatile__(" LCTL 1,1,%0\n"
" LCTL 7,7,%0\n"
@@ -223,6 +225,8 @@
}
}

+ S390_lowcore.kernel_asce = pgdir_k;
+
/* enable virtual mapping in kernel mode */
__asm__ __volatile__("lctlg 1,1,%0\n\t"
"lctlg 7,7,%0\n\t"