Messages in this thread | | | Date | Tue, 17 May 2016 10:46:55 +0100 | From | Matt Fleming <> | Subject | Re: [GIT PULL] EFI fix |
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On Tue, 17 May, at 10:04:34AM, Matt Fleming wrote: > > Now I'm wondering whether other users of FRAME_BEGIN/FRAME_END make > this same mistake. Coccinelle might be able to detect it perhaps.
A quick bit of sed turned up the code in arch/x86/entry/entry_64.S, which looks to suffer from the same bug,
/* rdi: arg1 ... normal C conventions. rax is saved/restored. */ .macro THUNK name, func, put_ret_addr_in_rdi=0 .globl \name .type \name, @function \name: FRAME_BEGIN
/* this one pushes 9 elems, the next one would be %rIP */ pushq %rdi pushq %rsi pushq %rdx pushq %rcx pushq %rax pushq %r8 pushq %r9 pushq %r10 pushq %r11
.if \put_ret_addr_in_rdi /* 9*8(%rsp) is return addr on stack */ movq 9*8(%rsp), %rdi .endif
With CONFIG_FRAME_POINTER=y 9*8(%rsp) is actually the value of %rbp on entry, not the return address.
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