Stop using global variables to hold the file descriptor and offset used to
map the skas0 stubs. Instead, calculate them using the page physical
addresses.
Signed-off-by: Jeff Dike <[email protected]>
Index: linux-2.6.15-mm/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.15-mm.orig/arch/um/os-Linux/skas/process.c 2006-01-09 11:39:54.000000000 -0500
+++ linux-2.6.15-mm/arch/um/os-Linux/skas/process.c 2006-01-09 11:40:33.000000000 -0500
@@ -151,8 +151,6 @@ static void handle_trap(int pid, union u
}
extern int __syscall_stub_start;
-int stub_code_fd = -1;
-__u64 stub_code_offset;
static int userspace_tramp(void *stack)
{
@@ -167,30 +165,30 @@ static int userspace_tramp(void *stack)
/* This has a pte, but it can't be mapped in with the usual
* tlb_flush mechanism because this is part of that mechanism
*/
+ int fd;
+ __u64 offset;
+ fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
- PROT_EXEC, MAP_FIXED | MAP_PRIVATE,
- stub_code_fd, stub_code_offset);
+ PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
if(addr == MAP_FAILED){
- printk("mapping stub code failed, errno = %d\n",
+ printk("mapping mmap stub failed, errno = %d\n",
errno);
exit(1);
}
if(stack != NULL){
- int fd;
- __u64 offset;
fd = phys_mapping(to_phys(stack), &offset);
addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
PROT_READ | PROT_WRITE,
MAP_FIXED | MAP_SHARED, fd, offset);
if(addr == MAP_FAILED){
- printk("mapping stub stack failed, "
+ printk("mapping segfault stack failed, "
"errno = %d\n", errno);
exit(1);
}
}
}
- if(!ptrace_faultinfo){
+ if(!ptrace_faultinfo && (stack != NULL)){
unsigned long v = UML_CONFIG_STUB_CODE +
(unsigned long) stub_segv_handler -
(unsigned long) &__syscall_stub_start;
@@ -216,10 +214,6 @@ int start_userspace(unsigned long stub_s
unsigned long sp;
int pid, status, n, flags;
- if ( stub_code_fd == -1 )
- stub_code_fd = phys_mapping(to_phys(&__syscall_stub_start),
- &stub_code_offset);
-
stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
@@ -306,7 +300,6 @@ void userspace(union uml_pt_regs *regs)
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
- again:
pid = userspace_pid[0];
interrupt_end();
@@ -395,6 +388,9 @@ void map_stub_pages(int fd, unsigned lon
{
struct proc_mm_op mmop;
int n;
+ __u64 code_offset;
+ int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
+ &code_offset);
mmop = ((struct proc_mm_op) { .op = MM_MMAP,
.u =
@@ -403,8 +399,8 @@ void map_stub_pages(int fd, unsigned lon
.len = PAGE_SIZE,
.prot = PROT_EXEC,
.flags = MAP_FIXED | MAP_PRIVATE,
- .fd = stub_code_fd,
- .offset = stub_code_offset
+ .fd = code_fd,
+ .offset = code_offset
} } });
n = os_write_file(fd, &mmop, sizeof(mmop));
if(n != sizeof(mmop))