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Add dwarf annotations to the amd64 _rtld_bind_start to allow debuggers

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to unwind around the calls from PLT to binder.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2014-04-14 22:44:50 +00:00
parent 819b4fd06a
commit 8cc5663495
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=264481
1 changed files with 43 additions and 0 deletions
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43
libexec/rtld-elf/amd64/rtld_start.S
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@ -79,17 +79,39 @@
.globl _rtld_bind_start
.type _rtld_bind_start,@function
_rtld_bind_start:
.cfi_startproc
.cfi_adjust_cfa_offset 16
subq $8,%rsp
.cfi_adjust_cfa_offset 8
pushfq # Save rflags
.cfi_adjust_cfa_offset 8
pushq %rax # Save %rax
.cfi_adjust_cfa_offset 8
.cfi_offset %rax,-32
pushq %rdx # Save %rdx
.cfi_adjust_cfa_offset 8
.cfi_offset %rdx,-40
pushq %rcx # Save %rcx
.cfi_adjust_cfa_offset 8
.cfi_offset %rcx,-48
pushq %rsi # Save %rsi
.cfi_adjust_cfa_offset 8
.cfi_offset %rsi,-56
pushq %rdi # Save %rdi
.cfi_adjust_cfa_offset 8
.cfi_offset %rdi,-64
pushq %r8 # Save %r8
.cfi_adjust_cfa_offset 8
.cfi_offset %r8,-72
pushq %r9 # Save %r9
.cfi_adjust_cfa_offset 8
.cfi_offset %r9,-80
pushq %r10 # Save %r10
.cfi_adjust_cfa_offset 8
.cfi_offset %r10,-88
pushq %r11 # Save %r11
.cfi_adjust_cfa_offset 8
.cfi_offset %r11,-96
movq 0x58(%rsp),%rdi # Fetch obj argument
movq 0x60(%rsp),%rsi # Fetch reloff argument
@ -101,16 +123,37 @@ _rtld_bind_start:
movq %rax,0x60(%rsp) # Store target over reloff argument
popq %r11 # Restore %r11
.cfi_adjust_cfa_offset -8
.cfi_restore %r11
popq %r10 # Restore %r10
.cfi_adjust_cfa_offset -8
.cfi_restore %r10
popq %r9 # Restore %r9
.cfi_adjust_cfa_offset -8
.cfi_restore %r9
popq %r8 # Restore %r8
.cfi_adjust_cfa_offset -8
.cfi_restore %r8
popq %rdi # Restore %rdi
.cfi_adjust_cfa_offset -8
.cfi_restore %rdi
popq %rsi # Restore %rsi
.cfi_adjust_cfa_offset -8
.cfi_restore %rsi
popq %rcx # Restore %rcx
.cfi_adjust_cfa_offset -8
.cfi_restore %rcx
popq %rdx # Restore %rdx
.cfi_adjust_cfa_offset -8
.cfi_restore %rdx
popq %rax # Restore %rax
.cfi_adjust_cfa_offset -8
.cfi_restore %rax
popfq # Restore rflags
.cfi_adjust_cfa_offset -8
leaq 16(%rsp),%rsp # Discard spare, obj, do not change rflags
ret # "Return" to target address
.cfi_endproc
.size _rtld_bind_start, . - _rtld_bind_start
.section .note.GNU-stack,"",%progbits