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GNU C Library master sources branch master updated. glibc-2.23-47-g5cdc3d9
- From: ppluzhnikov at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 3 Mar 2016 17:54:08 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.23-47-g5cdc3d9
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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=5cdc3d9db02773ff9904642254edb4c0fb67c9ee
commit 5cdc3d9db02773ff9904642254edb4c0fb67c9ee
Author: Paul Pluzhnikov <ppluzhnikov@google.com>
Date: Thu Mar 3 09:53:49 2016 -0800
2016-03-03 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #19490]
* sysdeps/x86_64/_mcount.S (_mcount): Add unwind descriptor.
(__fentry__): Likewise
diff --git a/ChangeLog b/ChangeLog
index a31f95a..24c2b65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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).
diff --git a/sysdeps/x86_64/_mcount.S b/sysdeps/x86_64/_mcount.S
index ba13643..a506d21 100644
--- a/sysdeps/x86_64/_mcount.S
+++ b/sysdeps/x86_64/_mcount.S
@@ -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__)
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 6 +++++
sysdeps/x86_64/_mcount.S | 55 +++++++++++++++++++++++++++++++++++-----------
2 files changed, 48 insertions(+), 13 deletions(-)
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