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2016-03-03 Paul Pluzhnikov <ppluzhnikov@google.com>

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[BZ #19490]
	* sysdeps/x86_64/_mcount.S (_mcount): Add unwind descriptor.
	(__fentry__): Likewise
This commit is contained in:
Paul Pluzhnikov 2016-03-03 09:53:49 -08:00
parent 87a07a4376
commit 5cdc3d9db0
2 changed files with 48 additions and 13 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2016-03-03 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #19490]
* sysdeps/x86_64/_mcount.S (_mcount): Add unwind descriptor.
(__fentry__): Likewise
2016-03-03 H.J. Lu <hongjiu.lu@intel.com>
* gmon/Makefile (noprof): Add $(sysdep_noprof).

55
sysdeps/x86_64/_mcount.S
View File

@ -24,19 +24,24 @@
#include <sysdep.h>
.globl C_SYMBOL_NAME(_mcount)
.type C_SYMBOL_NAME(_mcount), @function
.align ALIGNARG(4)
C_LABEL(_mcount)
ENTRY(_mcount)
/* Allocate space for 7 registers. */
subq $56,%rsp
cfi_adjust_cfa_offset (56)
movq %rax,(%rsp)
cfi_rel_offset (rax, 0)
movq %rcx,8(%rsp)
cfi_rel_offset (rcx, 8)
movq %rdx,16(%rsp)
cfi_rel_offset (rdx, 16)
movq %rsi,24(%rsp)
cfi_rel_offset (rsi, 24)
movq %rdi,32(%rsp)
cfi_rel_offset (rdi, 32)
movq %r8,40(%rsp)
cfi_rel_offset (r8, 40)
movq %r9,48(%rsp)
cfi_rel_offset (r9, 48)
/* Setup parameter for __mcount_internal. */
/* selfpc is the return address on the stack. */
@ -47,33 +52,50 @@ C_LABEL(_mcount)
/* Pop the saved registers. Please note that `mcount' has no
return value. */
movq 48(%rsp),%r9
cfi_restore (r9)
movq 40(%rsp),%r8
cfi_restore (r8)
movq 32(%rsp),%rdi
cfi_restore (rdi)
movq 24(%rsp),%rsi
cfi_restore (rsi)
movq 16(%rsp),%rdx
cfi_restore (rdx)
movq 8(%rsp),%rcx
cfi_restore (rcx)
movq (%rsp),%rax
cfi_restore (rax)
addq $56,%rsp
cfi_adjust_cfa_offset (-56)
ret
ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount))
END(_mcount)
#undef mcount
weak_alias (_mcount, mcount)
.globl C_SYMBOL_NAME(__fentry__)
.type C_SYMBOL_NAME(__fentry__), @function
.align ALIGNARG(4)
C_LABEL(__fentry__)
/* Allocate space for 7 registers. */
/* __fentry__ is different from _mcount in that it is called before
function prolog. This means (among other things) that it has non-standard
stack alignment on entry: (%RSP & 0xF) == 0. */
ENTRY(__fentry__)
/* Allocate space for 7 registers
(+8 bytes for proper stack alignment). */
subq $64,%rsp
cfi_adjust_cfa_offset (64)
movq %rax,(%rsp)
cfi_rel_offset (rax, 0)
movq %rcx,8(%rsp)
cfi_rel_offset (rcx, 8)
movq %rdx,16(%rsp)
cfi_rel_offset (rdx, 16)
movq %rsi,24(%rsp)
cfi_rel_offset (rsi, 24)
movq %rdi,32(%rsp)
cfi_rel_offset (rdi, 32)
movq %r8,40(%rsp)
cfi_rel_offset (r8, 40)
movq %r9,48(%rsp)
cfi_rel_offset (r9, 48)
/* Setup parameter for __mcount_internal. */
/* selfpc is the return address on the stack. */
@ -84,13 +106,20 @@ C_LABEL(__fentry__)
/* Pop the saved registers. Please note that `__fentry__' has no
return value. */
movq 48(%rsp),%r9
cfi_restore (r9)
movq 40(%rsp),%r8
cfi_restore (r8)
movq 32(%rsp),%rdi
cfi_restore (rdi)
movq 24(%rsp),%rsi
cfi_restore (rsi)
movq 16(%rsp),%rdx
cfi_restore (rdx)
movq 8(%rsp),%rcx
cfi_restore (rcx)
movq (%rsp),%rax
cfi_restore (rax)
addq $64,%rsp
cfi_adjust_cfa_offset (-64)
ret
ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__))
END(__fentry__)