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This change progresses our AARCH64 support:

- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64

This change makes general improvements to Cosmo and Redbean:

- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO
This commit is contained in:
Justine Tunney 2023-06-03 08:12:13 -07:00
parent 5655c9a4e7
commit 8f522cb702
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GPG key ID: BE714B4575D6E328
116 changed files with 1194 additions and 1025 deletions
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29
libc/log/oncrash_arm64.c
View file

@ -217,14 +217,17 @@ relegated void __oncrash_arm64(int sig, struct siginfo *si, void *arg) {
for (j = 0; j < 4; ++j) {
int r = 8 * j + i;
if (j) Append(b, " ");
Append(b, "%s%016lx%s %sr%d", ColorRegister(r),
ctx->uc_mcontext.regs[r], reset, r == 8 || r == 9 ? " " : "",
r);
Append(b, "%s%016lx%s %d%s", ColorRegister(r),
ctx->uc_mcontext.regs[r], reset, r,
r == 8 || r == 9 ? " " : "");
}
Append(b, "\n");
}
// PRINT CURRENT LOCATION
//
// We can get the address of the currently executing function by
// simply examining the program counter.
pc = ctx->uc_mcontext.pc;
Append(b, " %016lx sp %lx pc", ctx->uc_mcontext.sp, pc);
if (pc && (symbol = __get_symbol(st, pc))) {
@ -239,6 +242,13 @@ relegated void __oncrash_arm64(int sig, struct siginfo *si, void *arg) {
Append(b, "\n");
// PRINT LINKED LOCATION
//
// The x30 register can usually tell us the address of the parent
// function. This can help us determine the caller in cases where
// stack frames aren't being generated by the compiler; but if we
// have stack frames, then we need to ensure this won't duplicate
// the first element of the frame pointer backtrace below.
fp = (struct StackFrame *)ctx->uc_mcontext.regs[29];
if (IsCode((pc = ctx->uc_mcontext.regs[30]))) {
Append(b, " %016lx sp %lx lr", ctx->uc_mcontext.sp, pc);
if (pc && (symbol = __get_symbol(st, pc))) {
@ -251,10 +261,18 @@ relegated void __oncrash_arm64(int sig, struct siginfo *si, void *arg) {
}
}
Append(b, "\n");
if (fp && !kisdangerous(fp) && pc == fp->addr) {
fp = fp->next;
}
}
// PRINT FRAME POINTERS
fp = (struct StackFrame *)ctx->uc_mcontext.regs[29];
//
// The prologues and epilogues of non-leaf functions should save
// the frame pointer (x29) and return address (x30) to the stack
// and then set x29 to sp, which is the address of the new frame
// effectively creating a daisy chain letting us trace back into
// the origin of execution, e.g. _start(), or sys_clone_linux().
for (i = 0; fp; fp = fp->next) {
if (kisdangerous(fp)) {
Append(b, " %016lx <dangerous fp>\n", fp);
@ -284,9 +302,10 @@ relegated void __oncrash_arm64(int sig, struct siginfo *si, void *arg) {
}
}
} else {
Append(b, "got %G while crashing!\n");
Append(b, "got %G while crashing!\n", sig);
}
sys_write(2, b->p, MIN(b->i, b->n));
__print_maps();
_Exit(128 + sig);
}