[TOOLCHAIN] Making musl portable

util/patch_musl.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+set -e
+
+function main()
+{
+  readonly musl_dir=$1
+
+  syscall_arch=${musl_dir}/arch/x86_64/syscall_arch.h
+
+  syscall_in=${musl_dir}/arch/x86_64/bits/syscall.h.in
+
+  syscall_dir=${musl_dir}/src/internal/x86_64/
+
+  rm ${musl_dir}/src/thread/x86_64/__set_thread_area.s
+  rm ${syscall_dir}/syscall.s
+
+  cat >> ${syscall_arch} << EOF
+#define SYSCALL_NO_INLINE
+EOF
+
+  cat > ${syscall_dir}/syscall_1.c << EOF
+#include <stdarg.h>
+
+#pragma weak __syscall_common
+long __syscall_common(long num, ...)
+{
+  for(;;);
+}
+long __syscall_default(long num, ...)
+{ for(;;); }
+
+typedef long (*syscall_fn)(long, ...);
+
+EOF
+
+  sed -n -E 's/.*__NR_([^[:space:]]+).*/long __attribute__\(\(weak\)\) __syscall_\1\(long, ...\);/p' < ${syscall_in} >> ${syscall_dir}/syscall_1.c
+
+  cat >> ${syscall_dir}/syscall_1.c << EOF
+
+syscall_fn __syscall_fns[] = {
+EOF
+
+  sed -n -E 's/.*__NR_([^[:space:]]+)[[:space:]]+([0-9]+).*/\[\2\] = __syscall_\1,/p' < ${syscall_in} >> ${syscall_dir}/syscall_1.c
+
+  cat >> ${syscall_dir}/syscall_1.c << EOF
+
+};
+
+EOF
+cat >${syscall_dir}/syscall_2.c << EOF
+#include <stdarg.h>
+typedef long (*syscall_fn)(long, ...);
+extern long __syscall_common(long, ...);
+extern syscall_fn __syscall_fns[];
+
+long __syscall(long num, ...)
+{
+  va_list args;
+  va_start(args, num);
+  long a1 = va_arg(args, long);
+  long a2 = va_arg(args, long);
+  long a3 = va_arg(args, long);
+  long a4 = va_arg(args, long);
+  long a5 = va_arg(args, long);
+  long a6 = va_arg(args, long);
+  va_end(args);
+
+  if(__syscall_fns[num])
+    return __syscall_fns[num](num, a1, a2, a3, a4, a5, a6);
+  else
+    return __syscall_common(num, a1, a2, a3, a4, a5, a6);
+}
+EOF
+
+cat >${musl_dir}/arch/x86_64/pthread_arch.h <<EOF
+struct pthread *__pthread_self();
+#define TP_ADJ(p) (p)
+#define MC_PC gregs[REG_RIP]
+EOF
+
+}
+
+main $@