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sortix--sortix/libc/x64/calltrace.s
Jonas 'Sortie' Termansen f6371bfcec Add calltrace(3) function.
2013-12-17 14:30:27 +01:00

53 lines
1.6 KiB
ArmAsm

/*******************************************************************************
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/>.
x64/calltrace.s
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 %rbp
mov %rsp, %rbp
push %rbx
push %r12
xor %r12, %r12
mov %rbp, %rbx
.Lasm_calltrace_unwind:
test %rbx, %rbx
jz .Lasm_calltrace_done
mov 8(%rbx), %rsi # Previous RIP
mov 0(%rbx), %rbx # Previous RBP
test %rsi, %rsi
jz .Lasm_calltrace_done
mov %r12, %rdi
call calltrace_print_function
inc %r12
jmp .Lasm_calltrace_unwind
.Lasm_calltrace_done:
pop %r12
pop %rbx
pop %rbp
ret
.size asm_calltrace, . - asm_calltrace