mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
synced 2026-04-18 03:23:53 -04:00
3d66c4e14f
In principle, it is possible to use nolibc for only some object files in a program. In that case, the startup code in _start and _start_c is not going to be used. Add the NOLIBC_NO_RUNTIME compile time option to disable it entirely and also remove anything that depends on it. Doing this avoids warnings from modpost for UML as the _start_c code references the main function from the .init.text section while it is not inside .init itself. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
210 lines
8.9 KiB
C
210 lines
8.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* SPARC (32bit and 64bit) specific definitions for NOLIBC
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* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_ARCH_SPARC_H
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#define _NOLIBC_ARCH_SPARC_H
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#include <linux/unistd.h>
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#include "compiler.h"
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#include "crt.h"
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/*
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* Syscalls for SPARC:
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* - registers are native word size
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* - syscall number is passed in g1
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* - arguments are in o0-o5
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* - the system call is performed by calling a trap instruction
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* - syscall return value is in o0
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* - syscall error flag is in the carry bit of the processor status register
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*/
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#ifdef __arch64__
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#define _NOLIBC_SYSCALL "t 0x6d\n" \
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"bcs,a %%xcc, 1f\n" \
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"sub %%g0, %%o0, %%o0\n" \
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"1:\n"
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#else
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#define _NOLIBC_SYSCALL "t 0x10\n" \
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"bcs,a 1f\n" \
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"sub %%g0, %%o0, %%o0\n" \
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"1:\n"
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#endif /* __arch64__ */
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#define my_syscall0(num) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0"); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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register long _arg2 __asm__ ("o1") = (long)(arg2); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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register long _arg2 __asm__ ("o1") = (long)(arg2); \
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register long _arg3 __asm__ ("o2") = (long)(arg3); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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register long _arg2 __asm__ ("o1") = (long)(arg2); \
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register long _arg3 __asm__ ("o2") = (long)(arg3); \
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register long _arg4 __asm__ ("o3") = (long)(arg4); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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register long _arg2 __asm__ ("o1") = (long)(arg2); \
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register long _arg3 __asm__ ("o2") = (long)(arg3); \
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register long _arg4 __asm__ ("o3") = (long)(arg4); \
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register long _arg5 __asm__ ("o4") = (long)(arg5); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _num __asm__ ("g1") = (num); \
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register long _arg1 __asm__ ("o0") = (long)(arg1); \
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register long _arg2 __asm__ ("o1") = (long)(arg2); \
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register long _arg3 __asm__ ("o2") = (long)(arg3); \
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register long _arg4 __asm__ ("o3") = (long)(arg4); \
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register long _arg5 __asm__ ("o4") = (long)(arg5); \
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register long _arg6 __asm__ ("o5") = (long)(arg6); \
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\
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__asm__ volatile ( \
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_NOLIBC_SYSCALL \
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: "+r"(_arg1) \
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: "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), "r"(_arg6), \
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"r"(_num) \
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: "memory", "cc" \
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); \
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_arg1; \
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})
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#ifndef NOLIBC_NO_RUNTIME
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/* startup code */
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void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
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{
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__asm__ volatile (
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/*
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* Save argc pointer to o0, as arg1 of _start_c.
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* Account for the window save area, which is 16 registers wide.
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*/
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#ifdef __arch64__
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"add %sp, 128 + 2047, %o0\n" /* on sparc64 / v9 the stack is offset by 2047 */
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#else
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"add %sp, 64, %o0\n"
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#endif
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"b,a _start_c\n" /* transfer to c runtime */
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);
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__nolibc_entrypoint_epilogue();
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}
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#endif /* NOLIBC_NO_RUNTIME */
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static pid_t getpid(void);
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static __attribute__((unused))
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pid_t sys_fork(void)
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{
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pid_t parent, ret;
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parent = getpid();
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ret = my_syscall0(__NR_fork);
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/* The syscall returns the parent pid in the child instead of 0 */
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if (ret == parent)
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return 0;
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else
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return ret;
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}
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#define sys_fork sys_fork
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static __attribute__((unused))
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pid_t sys_vfork(void)
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{
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pid_t parent, ret;
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parent = getpid();
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ret = my_syscall0(__NR_vfork);
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/* The syscall returns the parent pid in the child instead of 0 */
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if (ret == parent)
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return 0;
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else
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return ret;
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}
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#define sys_vfork sys_vfork
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#endif /* _NOLIBC_ARCH_SPARC_H */
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