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sortix--sortix/kernel/x64/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/>.
x64/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 %rbp
push %rbx
movq %rsp, %rbp
push %rbx
movq %rdi, %rbx
testq %rbx, %rbx
jnz 1f
movq %rbp, %rbx
1:
xorl %edi, %edi
calltrace_unwind:
testq %rbx, %rbx
jz calltrace_done
movq 8(%rbx), %rsi # Previous RIP
movq 0(%rbx), %rbx # Previous RBP
pushq %rdi
call calltrace_print_function
popq %rdi
incq %rdi
jmp calltrace_unwind
calltrace_done:
popq %rbx
popq %rbp
retq
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.size calltrace, . - calltrace