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Make more code aarch64 friendly

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Justine Tunney 2023-05-02 13:38:16 -07:00
parent ca2860947f
commit 2b73e72d59
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GPG key ID: BE714B4575D6E328
568 changed files with 2197 additions and 1061 deletions
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39
libc/calls/mremap-sysv.greg.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/asmflag.h"
@ -34,34 +35,52 @@
* features like ASAN memory safety and kprintf() won't work as well.
*/
privileged void *sys_mremap(void *p, size_t n, size_t m, int f, void *q) {
#ifdef __x86_64__
bool cf;
uintptr_t rax, rdi, rsi, rdx;
uintptr_t res, rdi, rsi, rdx;
register uintptr_t r8 asm("r8");
register uintptr_t r10 asm("r10");
if (IsLinux()) {
r10 = f;
r8 = (uintptr_t)q;
asm("syscall"
: "=a"(rax)
: "=a"(res)
: "0"(0x019), "D"(p), "S"(n), "d"(m), "r"(r10), "r"(r8)
: "rcx", "r11", "memory", "cc");
if (rax > -4096ul) errno = -rax, rax = -1;
if (res > -4096ul) errno = -res, res = -1;
} else if (IsNetbsd()) {
if (f & MREMAP_MAYMOVE) {
rax = 0x19B;
res = 0x19B;
r10 = m;
r8 = (f & MREMAP_FIXED) ? MAP_FIXED : 0;
asm(CFLAG_ASM("syscall")
: CFLAG_CONSTRAINT(cf), "+a"(rax), "=d"(rdx)
: CFLAG_CONSTRAINT(cf), "+a"(res), "=d"(rdx)
: "D"(p), "S"(n), "2"(q), "r"(r10), "r"(r8)
: "rcx", "r9", "r11", "memory", "cc");
if (cf) errno = rax, rax = -1;
if (cf) errno = res, res = -1;
} else {
rax = einval();
res = einval();
}
} else {
rax = enosys();
res = enosys();
}
KERNTRACE("sys_mremap(%p, %'zu, %'zu, %#b, %p) → %p% m", p, n, m, f, q, rax);
return (void *)rax;
#elif defined(__aarch64__)
long res;
register long r0 asm("x0") = (long)p;
register long r1 asm("x1") = (long)n;
register long r2 asm("x2") = (long)m;
register long r3 asm("x3") = (long)f;
register long r4 asm("x4") = (long)q;
register long res_x0 asm("x0");
asm volatile("mov\tx8,%1\n"
"svc\t0"
: "=r"(res_x0)
: "i"(216), "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
: "x8", "memory");
res = _sysret64(res_x0);
#else
#error "arch unsupported"
#endif
KERNTRACE("sys_mremap(%p, %'zu, %'zu, %#b, %p) → %p% m", p, n, m, f, q, res);
return (void *)res;
}