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sortix--sortix/libc/x86/calltrace.S

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2013-01-06 10:49:36 -05:00
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
x86/calltrace.S
2013-01-06 10:49:36 -05:00
Attempts to unwind the stack and prints the code locations where functions
were called. This greatly aids debugging.
*******************************************************************************/
.global asm_calltrace
.type asm_calltrace, @function
asm_calltrace:
push %ebp
mov %esp, %ebp
push %ebx
push %esi
xor %esi, %esi
mov %ebp, %ebx
.Lasm_calltrace_unwind:
test %ebx, %ebx
jz .Lasm_calltrace_done
mov 4(%ebx), %ecx # Previous EIP
mov 0(%ebx), %ebx # Previous EBP
test %ecx, %ecx
jz .Lasm_calltrace_done
push %ecx
push %esi
call calltrace_print_function
add $8, %esp
inc %esi
jmp .Lasm_calltrace_unwind
.Lasm_calltrace_done:
pop %esi
pop %ebx
pop %ebp
ret
.size asm_calltrace, . - asm_calltrace