meta: move photon/libc to root

libc/sys/linux/machine/x86_64/crt0.s

@@ -0,0 +1,20 @@
+.global _start
+.type _start, @function
+
+.extern __fio_init
+.type __fio_init, @function
+
+.extern main
+.type main, @function
+
+_start:
+    xor %ebp, %ebp
+    mov (%rsp), %edi
+    lea 8(%rsp), %rsi
+    lea 16(%rsp, %rdi, 8), %rdx
+    xor %eax, %eax
+
+    call main
+    movq %rax, %rdi
+    movq $60, %rax
+    syscall

libc/sys/linux/machine/x86_64/syscall.c

@@ -0,0 +1,108 @@
+#include <stdint.h>
+
+intptr_t __syscall0(uintptr_t id)
+{
+    intptr_t ret = 0;
+    asm volatile("mov %1, %%rax; syscall; mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id));
+    return ret;
+}
+
+intptr_t __syscall1(uintptr_t id, uintptr_t p0)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "mov %1, %%rax;"
+            "mov %2, %%rdi;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0));
+    return ret;
+}
+
+intptr_t __syscall2(uintptr_t id, uintptr_t p0, uintptr_t p1)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "mov %1, %%rax;"
+            "mov %2, %%rdi;"
+            "mov %3, %%rsi;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0), "m" (p1));
+    return ret;
+}
+
+intptr_t __syscall3(uintptr_t id, uintptr_t p0, uintptr_t p1, uintptr_t p2)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "movq %1, %%rax;"
+            "mov %2, %%rdi;"
+            "mov %3, %%rsi;"
+            "mov %4, %%rdx;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0), "m" (p1), "m" (p2));
+    return ret;
+}
+
+intptr_t __syscall4(uintptr_t id, uintptr_t p0, uintptr_t p1, uintptr_t p2,
+        uintptr_t p3)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "mov %1, %%rax;"
+            "mov %2, %%rdi;"
+            "mov %3, %%rsi;"
+            "mov %4, %%rdx;"
+            "mov %5, %%r10;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0), "m" (p1), "m" (p2), "m" (p3));
+    return ret;
+}
+
+intptr_t __syscall5(uintptr_t id, uintptr_t p0, uintptr_t p1, uintptr_t p2,
+        uintptr_t p3, uintptr_t p4)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "mov %1, %%rax;"
+            "mov %2, %%rdi;"
+            "mov %3, %%rsi;"
+            "mov %4, %%rdx;"
+            "mov %5, %%r10;"
+            "mov %6, %%r8;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0), "m" (p1), "m" (p2), "m" (p3), "m" (p4));
+    return ret;
+}
+
+intptr_t __syscall6(uintptr_t id, uintptr_t p0, uintptr_t p1, uintptr_t p2,
+        uintptr_t p3, uintptr_t p4, uintptr_t p5)
+{
+    intptr_t ret = 0;
+    asm volatile(
+            "mov %1, %%rax;"
+            "mov %2, %%rdi;"
+            "mov %3, %%rsi;"
+            "mov %4, %%rdx;"
+            "mov %5, %%r10;"
+            "mov %6, %%r8;"
+            "mov %7, %%r9;"
+            "syscall;"
+            "mov %%rax, %0"
+            : "=m" (ret)
+            : "m" (id), "m" (p0), "m" (p1), "m" (p2), "m" (p3), "m" (p4),
+                "m" (p5));
+    return ret;
+}
+