60 lines
1.5 KiB
ArmAsm
60 lines
1.5 KiB
ArmAsm
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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x86/calltrace.s
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Attempts to unwind the stack and prints the code locations where functions
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were called. This greatly aids debugging.
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*******************************************************************************/
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.section .text
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.global calltrace
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.type calltrace, @function
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calltrace:
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push %ebp
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push %ebx
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movl %esp, %ebp
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push %ebx
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movl 8(%ebp), %ebx
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testl %ebx, %ebx
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jnz 1f
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movl %ebp, %ebx
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1:
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xorl %edi, %edi
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calltrace_unwind:
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testl %ebx, %ebx
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jz calltrace_done
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movl 4(%ebx), %esi # Previous EIP
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movl 0(%ebx), %ebx # Previous EBP
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pushl %esi
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pushl %edi
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call calltrace_print_function
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popl %edi
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addl $4, %esp
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incl %edi
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jmp calltrace_unwind
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calltrace_done:
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popl %ebx
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popl %ebp
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retl
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.size calltrace, . - calltrace
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