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Implement crash reporting for AARCH64

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The ShowCrashReports() feature for aarch64 should work even better than
the x86 crash reports. Thanks to the benefit of hindsight these reports
should be rock solid reliable and beautiful to read.

This change also improves the syscall polyfills for aarch64. Some of the
sys_foo() functions have been removed, usually because they're legacy or
downright footguns not worth building.
This commit is contained in:
Justine Tunney 2023-05-12 05:47:54 -07:00
parent 285e8a2348
commit 1f2a5a8fc1
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GPG key ID: BE714B4575D6E328
42 changed files with 540 additions and 247 deletions
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25
libc/runtime/fork-sysv.c
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@ -18,8 +18,11 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/sysv/consts/sig.h"
int sys_fork(void) {
#ifdef __x86_64__
axdx_t ad;
int ax, dx;
ad = __sys_fork();
@ -31,4 +34,26 @@ int sys_fork(void) {
ax &= dx - 1;
}
return ax;
#elif defined(__aarch64__)
int flags = 17; // SIGCHLD;
void *child_stack = 0;
void *parent_tidptr = 0;
void *newtls = 0;
void *child_tidptr = 0;
register long r0 asm("x0") = (long)flags;
register long r1 asm("x1") = (long)child_stack;
register long r2 asm("x2") = (long)parent_tidptr;
register long r3 asm("x3") = (long)newtls;
register long r4 asm("x4") = (long)child_tidptr;
register long res_x0 asm("x0");
asm volatile("mov\tx8,%1\n\t"
"svc\t0"
: "=r"(res_x0)
: "i"(220), "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
: "x8", "memory");
return _sysret(res_x0);
#endif
}