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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2023-10-09 13:50:51 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2023-10-12 16:27:03 +0200 |
| commit | db96abb2cc1b035e4fdcfb62ea4c16ef9f091b43 (patch) | |
| tree | 23b24b7473a0c9c7ec680c7268a9614c554553a2 /arch/x86/lib | |
| parent | 5155dc05760174ab7b2d5ff931e3c9dea079b847 (diff) | |
| download | barebox-db96abb2cc1b035e4fdcfb62ea4c16ef9f091b43.tar.gz barebox-db96abb2cc1b035e4fdcfb62ea4c16ef9f091b43.tar.xz | |
x86: setjmp: set base pointer to zero in initjmp
Initializing the frame points to a known-bad value like zero makes it
easier for code unwinding the stack to know when to stop. Thus
initialize the stack pointer in initjmp-initialized jump buffers to
zero.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20231009115051.1931562-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/setjmp_32.S | 1 | ||||
| -rw-r--r-- | arch/x86/lib/setjmp_64.S | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/lib/setjmp_32.S b/arch/x86/lib/setjmp_32.S index 30db5f989a..5814623f94 100644 --- a/arch/x86/lib/setjmp_32.S +++ b/arch/x86/lib/setjmp_32.S @@ -54,6 +54,7 @@ ENDPROC(longjmp) ENTRY(initjmp) movl %edx, 20(%eax) /* Return address */ + movl $0, 8(%edx) /* Base pointer */ sub $ASM_SZPTR, %ecx /* ESP - 4 has to be 16-byte aligned on entry */ movl %ecx, 4(%eax) /* Stack top */ xorl %eax, %eax /* Return value */ diff --git a/arch/x86/lib/setjmp_64.S b/arch/x86/lib/setjmp_64.S index d5cf99a155..bfa1521499 100644 --- a/arch/x86/lib/setjmp_64.S +++ b/arch/x86/lib/setjmp_64.S @@ -54,6 +54,7 @@ ENDPROC(longjmp) ENTRY(initjmp) movq %rsi, (%rdi) /* Return address */ + movq $0, 16(%rdi) /* Base pointer */ sub $ASM_SZPTR, %rdx /* RSP - 8 has to be 16-byte aligned on entry */ movq %rdx, 8(%rdi) /* Stack top */ xorq %rax, %rax |