2013-01-06 10:49:36 -05:00
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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2013-12-28 15:00:15 -05:00
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x86/calltrace.S
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2013-01-06 10:49:36 -05:00
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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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.global asm_calltrace
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.type asm_calltrace, @function
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asm_calltrace:
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push %ebp
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mov %esp, %ebp
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push %ebx
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push %esi
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xor %esi, %esi
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mov %ebp, %ebx
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.Lasm_calltrace_unwind:
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test %ebx, %ebx
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jz .Lasm_calltrace_done
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mov 4(%ebx), %ecx # Previous EIP
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mov 0(%ebx), %ebx # Previous EBP
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test %ecx, %ecx
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jz .Lasm_calltrace_done
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push %ecx
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push %esi
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call calltrace_print_function
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add $8, %esp
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inc %esi
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jmp .Lasm_calltrace_unwind
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.Lasm_calltrace_done:
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pop %esi
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pop %ebx
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pop %ebp
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ret
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.size asm_calltrace, . - asm_calltrace
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