From: Guo Ren <[email protected]>
The independent softirq/irq stack uses s0 to save & restore sp, but s0
would be corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber
list to fix the problem.
<+0>: addi sp,sp,-32
<+2>: sd s0,16(sp)
<+4>: sd s1,8(sp)
<+6>: sd ra,24(sp)
<+8>: sd s2,0(sp)
<+10>: mv s0,a0 --> compiler allocate s0 for a0 when CONFIG_FRAME_POINTER=n
<+12>: jal ra,0xffffffff800bc0ce <irqentry_enter>
<+16>: ld a5,56(tp) # 0x38
<+20>: lui a4,0x4
<+22>: mv s1,a0
<+24>: xor a5,a5,sp
<+28>: bgeu a5,a4,0xffffffff800bc092 <do_irq+88>
<+32>: auipc s2,0x5d
<+36>: ld s2,1118(s2) # 0xffffffff801194b8 <irq_stack_ptr>
<+40>: add s2,s2,a4
<+42>: addi sp,sp,-8
<+44>: sd ra,0(sp)
<+46>: addi sp,sp,-8
<+48>: sd s0,0(sp)
<+50>: addi s0,sp,16 --> our code clobber the s0
<+52>: mv sp,s2
<+54>: mv a0,s0 --> a0 got wrong value for handle_riscv_irq
<+56>: jal ra,0xffffffff800bbb3a <handle_riscv_irq>
Changelog:
V2
- Fixup compile error with CONFIG_FRAME_POINTER=y
- FIxup [email protected] tag
Guo Ren (2):
riscv: stack: Fixup independent irq stack for CONFIG_FRAME_POINTER=n
riscv: stack: Fixup independent softirq stack for
CONFIG_FRAME_POINTER=n
arch/riscv/kernel/irq.c | 3 +++
arch/riscv/kernel/traps.c | 3 +++
2 files changed, 6 insertions(+)
--
2.36.1
From: Guo Ren <[email protected]>
The independent softirq stack uses s0 to save & restore sp, but s0 would
be corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber list
to fix the problem.
Fixes: dd69d07a5a6c ("riscv: stack: Support HAVE_SOFTIRQ_ON_OWN_STACK")
Cc: [email protected]
Reported-by: Zhangjin Wu <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
---
arch/riscv/kernel/irq.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index d0577cc6a081..a8efa053c4a5 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -84,6 +84,9 @@ void do_softirq_own_stack(void)
: [sp] "r" (sp)
: "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7",
"t0", "t1", "t2", "t3", "t4", "t5", "t6",
+#ifndef CONFIG_FRAME_POINTER
+ "s0",
+#endif
"memory");
} else
#endif
--
2.36.1
On Sat, Jul 15, 2023 at 08:15:04PM -0400, [email protected] wrote:
> From: Guo Ren <[email protected]>
>
> The independent softirq/irq stack uses s0 to save & restore sp, but s0
> would be corrupted when CONFIG_FRAME_POINTER=n. So add s0 in the clobber
> list to fix the problem.
>
> <+0>: addi sp,sp,-32
> <+2>: sd s0,16(sp)
> <+4>: sd s1,8(sp)
> <+6>: sd ra,24(sp)
> <+8>: sd s2,0(sp)
> <+10>: mv s0,a0 --> compiler allocate s0 for a0 when CONFIG_FRAME_POINTER=n
> <+12>: jal ra,0xffffffff800bc0ce <irqentry_enter>
> <+16>: ld a5,56(tp) # 0x38
> <+20>: lui a4,0x4
> <+22>: mv s1,a0
> <+24>: xor a5,a5,sp
> <+28>: bgeu a5,a4,0xffffffff800bc092 <do_irq+88>
> <+32>: auipc s2,0x5d
> <+36>: ld s2,1118(s2) # 0xffffffff801194b8 <irq_stack_ptr>
> <+40>: add s2,s2,a4
> <+42>: addi sp,sp,-8
> <+44>: sd ra,0(sp)
> <+46>: addi sp,sp,-8
> <+48>: sd s0,0(sp)
> <+50>: addi s0,sp,16 --> our code clobber the s0
> <+52>: mv sp,s2
> <+54>: mv a0,s0 --> a0 got wrong value for handle_riscv_irq
> <+56>: jal ra,0xffffffff800bbb3a <handle_riscv_irq>
>
> Changelog:
> V2
> - Fixup compile error with CONFIG_FRAME_POINTER=y
> - FIxup [email protected] tag
>
> Guo Ren (2):
> riscv: stack: Fixup independent irq stack for CONFIG_FRAME_POINTER=n
> riscv: stack: Fixup independent softirq stack for
> CONFIG_FRAME_POINTER=n
>
> arch/riscv/kernel/irq.c | 3 +++
> arch/riscv/kernel/traps.c | 3 +++
> 2 files changed, 6 insertions(+)
>
> --
> 2.36.1
>
>
> _______________________________________________
> linux-riscv mailing list
> [email protected]
> http://lists.infradead.org/mailman/listinfo/linux-riscv
Tested-by: Drew Fustini <[email protected]>
Xi Ruoyao noticed that the mainline kernel crashed when using a kernel
config with CONFIG_FRAME_POINTER=n. I was able to reproduce this [1].
Emil suggested I trying this patche series. I can confirm that this
resolves the kernel crash on the Sipeed Lichee Pi4a [2].
Thanks,
Drew
[1] https://lore.kernel.org/linux-riscv/ZMNojqwLxcG8FcHN@x1/
[2] https://lore.kernel.org/linux-riscv/ZMQAqUfb0y%2FigQs2@x1/