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Make it possible to log kprintf() to file

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It's now possible to compile Emacs using cosmocc. However we need to
troubleshoot why it's event loop isn't working correctly at runtime.
This commit is contained in:
Justine Tunney 2023-06-05 04:16:15 -07:00
parent 9cc3e37263
commit f554dd800e
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
12 changed files with 94 additions and 15 deletions
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23
libc/intrin/kprintf.greg.c
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@ -103,6 +103,7 @@
break; \
}
_Hide long __klog_handle;
extern _Hide struct SymbolTable *__symtab;
privileged static inline char *kadvance(char *p, char *e, long n) {
@ -190,18 +191,30 @@ privileged bool kisdangerous(const void *p) {
return true;
}
privileged dontinline void klog(const char *b, size_t n) {
privileged static long kloghandle(void) {
if (__klog_handle) {
return __klog_handle;
} else if (!IsWindows()) {
return 2;
} else {
return __imp_GetStdHandle(kNtStdErrorHandle);
}
}
privileged void _klog(const char *b, size_t n) {
#ifdef __x86_64__
int e;
long h;
bool cf;
size_t i;
uint16_t dx;
uint32_t wrote;
unsigned char al;
long rax, rdi, rsi, rdx;
h = kloghandle();
if (IsWindows()) {
e = __imp_GetLastError();
__imp_WriteFile(__imp_GetStdHandle(kNtStdErrorHandle), b, n, &wrote, 0);
__imp_WriteFile(h, b, n, &wrote, 0);
__imp_SetLastError(e);
} else if (IsMetal()) {
if (_weaken(_klog_vga)) _weaken(_klog_vga)(b, n);
@ -220,11 +233,11 @@ privileged dontinline void klog(const char *b, size_t n) {
} else {
asm volatile("syscall"
: "=a"(rax), "=D"(rdi), "=S"(rsi), "=d"(rdx)
: "0"(__NR_write), "1"(2), "2"(b), "3"(n)
: "0"(__NR_write), "1"(h), "2"(b), "3"(n)
: "rcx", "r8", "r9", "r10", "r11", "memory", "cc");
}
#elif defined(__aarch64__)
register long r0 asm("x0") = (long)2;
register long r0 asm("x0") = (long)h;
register long r1 asm("x1") = (long)b;
register long r2 asm("x2") = (long)n;
register long r8 asm("x8") = (long)__NR_write;
@ -840,7 +853,7 @@ privileged void kvprintf(const char *fmt, va_list v) {
size_t n;
char b[4000];
n = kformat(b, sizeof(b), fmt, v);
klog(b, MIN(n, sizeof(b) - 1));
_klog(b, MIN(n, sizeof(b) - 1));
}
/**