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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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examples/crashreport.c Normal file
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#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/bits/pushpop.h"
#include "libc/calls/ucontext.h"
#include "libc/log/log.h"
#include "libc/math.h"
#include "libc/nt/enum/errormodeflags.h"
#include "libc/nt/signals.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
/**
* @fileoverview Demonstrates SEGFAULT via NULL pointer dereference.
*
* In MODE=dbg mode, UBSAN should catch this and display a backtrace.
* In most other modes, e.g. MODE=balanced, the oncrash.c sig handler
* will either launch GDB or display a very fancy report.
*
* make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
* o/opt/examples/crashreportdemo.com
*
* To prevent the GDB GUI from popping up:
*
* export GDB=""
* make -j8 -O MODE=opt o/opt/examples/crashreportdemo.com
* o/opt/examples/crashreportdemo.com
*/
int boo;
void boop(void);
int main(int argc, char *argv[]) {
int64_t res;
showcrashreports();
res = 0;
asm volatile(
"mov\t$0x1111111111111111,%rax\n\t"
"mov\t$0x3333333333333333,%rcx\n\t"
"mov\t$0x4444444444444444,%rdx\n\t"
"mov\t$0x8888888888888888,%r8\n\t"
"mov\t$0x9999999999999999,%r9d\n\t"
"mov\t$0xaaaaaaaaaaaaaaaa,%r10d\n\t"
"mov\t$0xbbbbbbbbbbbbbbbb,%r11d\n\t"
"mov\t$0x0000000000000000,%rax\n\t"
"movd\t%rax,%xmm0\n\t"
"mov\t$0x1111111111111111,%rax\n\t"
"movd\t%rax,%xmm1\n\t"
"mov\t$0x2222222222222222,%rax\n\t"
"movd\t%rax,%xmm2\n\t"
"mov\t$0x3333333333333333,%rax\n\t"
"movd\t%rax,%xmm3\n\t"
"mov\t$0x4444444444444444,%rax\n\t"
"movd\t%rax,%xmm4\n\t"
"mov\t$0x5555555555555555,%rax\n\t"
"movd\t%rax,%xmm5\n\t"
"mov\t$0x6666666666666666,%rax\n\t"
"movd\t%rax,%xmm6\n\t"
"mov\t$0x7777777777777777,%rax\n\t"
"movd\t%rax,%xmm7\n\t"
"mov\t$0x8888888888888888,%rax\n\t"
"movd\t%rax,%xmm8\n\t"
"mov\t$0x9999999999999999,%rax\n\t"
"movd\t%rax,%xmm9\n\t"
"mov\t$0xaaaaaaaaaaaaaaaa,%rax\n\t"
"movd\t%rax,%xmm10\n\t"
"mov\t$0xbbbbbbbbbbbbbbbb,%rax\n\t"
"movd\t%rax,%xmm11\n\t"
"mov\t$0xcccccccccccccccc,%rax\n\t"
"movd\t%rax,%xmm12\n\t"
"mov\t$0xdddddddddddddddd,%rax\n\t"
"movd\t%rax,%xmm13\n\t"
"mov\t$0xeeeeeeeeeeeeeeee,%rax\n\t"
"movd\t%rax,%xmm14\n\t"
"mov\t$0xffffffffffffffff,%rax\n\t"
"movd\t%rax,%xmm15\n\t"
"fldlg2\n\t");
res = *(int *)(intptr_t)boo / boo;
return res;
}