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sortix--sortix/kernel/x86/calltrace.S

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This file is part of Sortix.
Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
Sortix 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 General Public License for more
details.
You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86/calltrace.S
Attempts to unwind the stack and prints the code locations where functions
were called. This greatly aids debugging.
*******************************************************************************/
.section .text
.global calltrace
.type calltrace, @function
calltrace:
push %ebp
push %ebx
movl %esp, %ebp
push %ebx
movl 8(%ebp), %ebx
testl %ebx, %ebx
jnz 1f
movl %ebp, %ebx
1:
xorl %edi, %edi
calltrace_unwind:
testl %ebx, %ebx
jz calltrace_done
movl 4(%ebx), %esi # Previous EIP
movl 0(%ebx), %ebx # Previous EBP
pushl %esi
pushl %edi
call calltrace_print_function
popl %edi
addl $4, %esp
incl %edi
jmp calltrace_unwind
calltrace_done:
popl %ebx
popl %ebp
retl
2013-05-22 16:06:18 -04:00
.size calltrace, . - calltrace