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-rw-r--r--tools/include/nolibc/arch-s390.h186
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diff --git a/tools/include/nolibc/arch-s390.h b/tools/include/nolibc/arch-s390.h
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+++ b/tools/include/nolibc/arch-s390.h
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+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * s390 specific definitions for NOLIBC
+ */
+
+#ifndef _NOLIBC_ARCH_S390_H
+#define _NOLIBC_ARCH_S390_H
+#include <asm/signal.h>
+#include <asm/unistd.h>
+
+#include "compiler.h"
+#include "crt.h"
+
+/* Syscalls for s390:
+ * - registers are 64-bit
+ * - syscall number is passed in r1
+ * - arguments are in r2-r7
+ * - the system call is performed by calling the svc instruction
+ * - syscall return value is in r2
+ * - r1 and r2 are clobbered, others are preserved.
+ *
+ * Link s390 ABI: https://github.com/IBM/s390x-abi
+ *
+ */
+
+#define my_syscall0(num) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _rc __asm__ ("2"); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "=d"(_rc) \
+ : "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _rc; \
+})
+
+#define my_syscall1(num, arg1) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+#define my_syscall2(num, arg1, arg2) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ register long _arg2 __asm__ ("3") = (long)(arg2); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_arg2), "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+#define my_syscall3(num, arg1, arg2, arg3) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ register long _arg2 __asm__ ("3") = (long)(arg2); \
+ register long _arg3 __asm__ ("4") = (long)(arg3); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_arg2), "d"(_arg3), "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+#define my_syscall4(num, arg1, arg2, arg3, arg4) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ register long _arg2 __asm__ ("3") = (long)(arg2); \
+ register long _arg3 __asm__ ("4") = (long)(arg3); \
+ register long _arg4 __asm__ ("5") = (long)(arg4); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ register long _arg2 __asm__ ("3") = (long)(arg2); \
+ register long _arg3 __asm__ ("4") = (long)(arg3); \
+ register long _arg4 __asm__ ("5") = (long)(arg4); \
+ register long _arg5 __asm__ ("6") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
+ "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("1") = (num); \
+ register long _arg1 __asm__ ("2") = (long)(arg1); \
+ register long _arg2 __asm__ ("3") = (long)(arg2); \
+ register long _arg3 __asm__ ("4") = (long)(arg3); \
+ register long _arg4 __asm__ ("5") = (long)(arg4); \
+ register long _arg5 __asm__ ("6") = (long)(arg5); \
+ register long _arg6 __asm__ ("7") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "svc 0\n" \
+ : "+d"(_arg1) \
+ : "d"(_arg2), "d"(_arg3), "d"(_arg4), "d"(_arg5), \
+ "d"(_arg6), "d"(_num) \
+ : "memory", "cc" \
+ ); \
+ _arg1; \
+})
+
+/* startup code */
+void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
+{
+ __asm__ volatile (
+ "lgr %r2, %r15\n" /* save stack pointer to %r2, as arg1 of _start_c */
+ "aghi %r15, -160\n" /* allocate new stackframe */
+ "xc 0(8,%r15), 0(%r15)\n" /* clear backchain */
+ "brasl %r14, _start_c\n" /* transfer to c runtime */
+ );
+ __builtin_unreachable();
+}
+
+struct s390_mmap_arg_struct {
+ unsigned long addr;
+ unsigned long len;
+ unsigned long prot;
+ unsigned long flags;
+ unsigned long fd;
+ unsigned long offset;
+};
+
+static __attribute__((unused))
+void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
+ off_t offset)
+{
+ struct s390_mmap_arg_struct args = {
+ .addr = (unsigned long)addr,
+ .len = (unsigned long)length,
+ .prot = prot,
+ .flags = flags,
+ .fd = fd,
+ .offset = (unsigned long)offset
+ };
+
+ return (void *)my_syscall1(__NR_mmap, &args);
+}
+#define sys_mmap sys_mmap
+
+static __attribute__((unused))
+pid_t sys_fork(void)
+{
+ return my_syscall5(__NR_clone, 0, SIGCHLD, 0, 0, 0);
+}
+#define sys_fork sys_fork
+
+#endif /* _NOLIBC_ARCH_S390_H */