Squash commits for public release

libs/libc/include/setjmp.h

@@ -0,0 +1,60 @@
+#ifndef _LIBC_SETJMP_H
+#define _LIBC_SETJMP_H
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+#ifdef __i386__
+/**
+ * x86_32 (6 * 4):
+ *   - ebx
+ *   - esp
+ *   - ebp
+ *   - esi
+ *   - edi
+ *   - return address
+ */
+#define _jblen (6 * 4)
+#elif defined(__x86_64__)
+/**
+ * x86_64 (8 * 8):
+ *   - rip, rbp, rsp, rbx, r12, r13, r14, r15
+ */
+#define _jblen (8 * 8)
+#elif defined(__arm__)
+/**
+ * ARMv7 (11 * 4 + 8 * 8):
+ *   - r4 - r12, sp, lr
+ *   - d8-d15
+ */
+#define _jblen (11 * 4 + 8 * 8)
+#elif defined(__aarch64__)
+/**
+ * ARMv8 (22 * 8):
+ *   - x19-x28, x29(fp), x30(lr), x31(sp), x4(alignment)
+ *   - d8-d15
+ */
+#define _jblen (22 * 8)
+#elif (defined(__riscv) && (__riscv_xlen == 64))
+/**
+ * RISC-V 64bit (14 * 8):
+ *   - s0-s11, ra, sp
+ */
+#define _jblen (14 * 8)
+#endif
+
+struct __jmp_buf {
+    char regs[_jblen];
+};
+
+typedef struct __jmp_buf jmp_buf[1];
+typedef struct __jmp_buf sigjmp_buf[1];
+
+extern int setjmp(jmp_buf);
+extern void longjmp(jmp_buf, int val);
+
+__END_DECLS
+
+#endif