238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/* 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"
|
|
|
|
/* The struct returned by the stat() syscall, equivalent to stat64(). The
|
|
* syscall returns 116 bytes and stops in the middle of __unused.
|
|
*/
|
|
|
|
struct sys_stat_struct {
|
|
unsigned long st_dev;
|
|
unsigned long st_ino;
|
|
unsigned long st_nlink;
|
|
unsigned int st_mode;
|
|
unsigned int st_uid;
|
|
unsigned int st_gid;
|
|
unsigned int __pad1;
|
|
unsigned long st_rdev;
|
|
unsigned long st_size;
|
|
unsigned long st_atime;
|
|
unsigned long st_atime_nsec;
|
|
unsigned long st_mtime;
|
|
unsigned long st_mtime_nsec;
|
|
unsigned long st_ctime;
|
|
unsigned long st_ctime_nsec;
|
|
unsigned long st_blksize;
|
|
long st_blocks;
|
|
unsigned long __unused[3];
|
|
};
|
|
|
|
/* 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; \
|
|
})
|
|
|
|
char **environ __attribute__((weak));
|
|
const unsigned long *_auxv __attribute__((weak));
|
|
|
|
/* startup code */
|
|
void __attribute__((weak, noreturn, optimize("Os", "omit-frame-pointer"))) __no_stack_protector _start(void)
|
|
{
|
|
__asm__ volatile (
|
|
"lg %r2,0(%r15)\n" /* argument count */
|
|
"la %r3,8(%r15)\n" /* argument pointers */
|
|
|
|
"xgr %r0,%r0\n" /* r0 will be our NULL value */
|
|
/* search for envp */
|
|
"lgr %r4,%r3\n" /* start at argv */
|
|
"0:\n"
|
|
"clg %r0,0(%r4)\n" /* entry zero? */
|
|
"la %r4,8(%r4)\n" /* advance pointer */
|
|
"jnz 0b\n" /* no -> test next pointer */
|
|
/* yes -> r4 now contains start of envp */
|
|
"larl %r1,environ\n"
|
|
"stg %r4,0(%r1)\n"
|
|
|
|
/* search for auxv */
|
|
"lgr %r5,%r4\n" /* start at envp */
|
|
"1:\n"
|
|
"clg %r0,0(%r5)\n" /* entry zero? */
|
|
"la %r5,8(%r5)\n" /* advance pointer */
|
|
"jnz 1b\n" /* no -> test next pointer */
|
|
"larl %r1,_auxv\n" /* yes -> store value in _auxv */
|
|
"stg %r5,0(%r1)\n"
|
|
|
|
"aghi %r15,-160\n" /* allocate new stackframe */
|
|
"xc 0(8,%r15),0(%r15)\n" /* clear backchain */
|
|
"brasl %r14,main\n" /* ret value of main is arg to exit */
|
|
"lghi %r1,1\n" /* __NR_exit */
|
|
"svc 0\n"
|
|
);
|
|
__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 */
|