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sortix--sortix/sortix/x64/calltrace.s
Jonas 'Sortie' Termansen cfbbf67247 make CALLTRACE=1 to enable printing primitive calltraces upon panic.
This won't work with optimizations turned fully on.

Added protection against double panics.
2012-03-02 14:08:25 +01:00

50 lines
1.3 KiB
ArmAsm

/*******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011, 2012.
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
movq %rsp, %rbp
xorl %edi, %edi
movq %rbp, %rbx
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 %rbp
retq