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or1k: Linux Syscall Interface
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Stafford Horne
201
sysdeps/unix/sysv/linux/or1k/sysdep.h
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201
sysdeps/unix/sysv/linux/or1k/sysdep.h
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/* Assembler and syscall macros. OpenRISC version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _LINUX_OR1K_SYSDEP_H
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#define _LINUX_OR1K_SYSDEP_H 1
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#include <sysdeps/or1k/sysdep.h>
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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#include <tls.h>
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/* "workarounds" for generic code needing to handle 64-bit time_t. */
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#undef __NR_clock_getres
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#undef __NR_futex
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#undef __NR_ppoll
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#undef __NR_pselect6
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#undef __NR_recvmmsg
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#undef __NR_rt_sigtimedwait
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#undef __NR_semtimedop
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#undef __NR_utimensat
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/* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c. */
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#define __NR_clock_getres __NR_clock_getres_time64
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/* Fix sysdeps/nptl/lowlevellock-futex.h. */
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#define __NR_futex __NR_futex_time64
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/* Fix sysdeps/unix/sysv/linux/pause.c. */
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#define __NR_ppoll __NR_ppoll_time64
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/* Fix sysdeps/unix/sysv/linux/select.c. */
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#define __NR_pselect6 __NR_pselect6_time64
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/* Fix sysdeps/unix/sysv/linux/recvmmsg.c. */
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#define __NR_recvmmsg __NR_recvmmsg_time64
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/* Fix sysdeps/unix/sysv/linux/sigtimedwait.c. */
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#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
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/* Fix sysdeps/unix/sysv/linux/semtimedop.c. */
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#define __NR_semtimedop __NR_semtimedop_time64
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/* Hack sysdeps/unix/sysv/linux/generic/utimes.c. */
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#define __NR_utimensat __NR_utimensat_time64
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#undef SYS_ify
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#define SYS_ify(syscall_name) (__NR_##syscall_name)
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/* Linux uses a negative return value to indicate syscall errors,
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unlike most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be
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negative even if the call succeeded. E.g., the lseek system call
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might return a large offset. Therefore we must not anymore test
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for < 0, but test for a real error by making sure the value in R0
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is a real error number. Linus said he will make sure the no syscall
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returns a value in -1 .. -4095 as a valid result so we can safely
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test with -4095. */
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#ifdef __ASSEMBLER__
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/* Macros used in syscall-template.S */
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#define ret l.jr r9; l.nop
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#define ret_NOERRNO l.jr r9; l.nop
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#undef DO_CALL
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#define DO_CALL(syscall_name) \
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l.addi r11, r0, SYS_ify (syscall_name); \
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l.sys 1; \
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l.nop
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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ENTRY (name); \
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DO_CALL(syscall_name); \
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/* if -4096 < ret < 0 holds, it's an error */ \
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l.sfgeui r11, 0xf001; \
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l.bf L(pseudo_end); \
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l.nop
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#undef PSEUDO_NOERRNO
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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ENTRY (name); \
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DO_CALL(syscall_name)
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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L(pseudo_end): \
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l.j SYSCALL_ERROR_NAME; \
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l.ori r3,r11,0; \
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END (name)
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#undef PSEUDO_END_NOERRNO
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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#ifndef PIC
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/* For static code, on error jump to __syscall_error directly. */
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# define SYSCALL_ERROR_NAME __syscall_error
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#elif !IS_IN (libc)
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/* Use the internal name for libc shared objects. */
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# define SYSCALL_ERROR_NAME __GI___syscall_error
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#else
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/* Otherwise, on error do a full PLT jump. */
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# define SYSCALL_ERROR_NAME plt(__syscall_error)
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#endif
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#else /* not __ASSEMBLER__ */
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#include <errno.h>
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extern long int __syscall_error (long int neg_errno);
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/* Pointer mangling is not yet supported for or1k. */
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#define PTR_MANGLE(var) (void) (var)
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#define PTR_DEMANGLE(var) (void) (var)
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, nr, args...) \
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INTERNAL_SYSCALL_NCS (SYS_ify (name), nr, args)
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/* The _NCS variant allows non-constant syscall numbers. */
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#undef INTERNAL_SYSCALL_NCS
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#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
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({ unsigned long int __sys_result; \
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{ \
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long int _sc_ret = (long int) number; \
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LOAD_ARGS_##nr (args) \
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register long int __sc_ret __asm__ ("r11") = _sc_ret; \
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__asm__ __volatile__ ("l.sys 1\n\t" \
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" l.nop\n\t" \
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: "+r" (__sc_ret) \
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: ASM_ARGS_##nr \
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: ASM_CLOBBERS_##nr \
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"r12", "r13", "r15", "r17", "r19", \
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"r21", "r23", "r25", "r27", "r29", \
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"r31", "memory"); \
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__sys_result = __sc_ret; \
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} \
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(long int) __sys_result; })
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/* From here on we have nested macros that generate code for
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setting up syscall arguments. */
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#define LOAD_ARGS_0()
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#define ASM_ARGS_0
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#define ASM_CLOBBERS_0 "r3", ASM_CLOBBERS_1
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#define LOAD_ARGS_1(a) \
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long int _a = (long int)(a); \
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register long int __a __asm__ ("r3") = _a;
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#define ASM_ARGS_1 "r" (__a)
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#define ASM_CLOBBERS_1 "r4", ASM_CLOBBERS_2
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#define LOAD_ARGS_2(a, b) \
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long int _b = (long int)(b); \
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LOAD_ARGS_1 (a) \
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register long int __b __asm__ ("r4") = _b;
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#define ASM_ARGS_2 ASM_ARGS_1, "r" (__b)
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#define ASM_CLOBBERS_2 "r5", ASM_CLOBBERS_3
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#define LOAD_ARGS_3(a, b, c) \
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long int _c = (long int)(c); \
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LOAD_ARGS_2 (a, b) \
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register long int __c __asm__ ("r5") = _c;
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#define ASM_ARGS_3 ASM_ARGS_2, "r" (__c)
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#define ASM_CLOBBERS_3 "r6", ASM_CLOBBERS_4
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#define LOAD_ARGS_4(a, b, c, d) \
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LOAD_ARGS_3 (a, b, c) \
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long int _d = (long int)(d); \
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register long int __d __asm__ ("r6") = _d;
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#define ASM_ARGS_4 ASM_ARGS_3, "r" (__d)
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#define ASM_CLOBBERS_4 "r7", ASM_CLOBBERS_5
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#define LOAD_ARGS_5(a, b, c, d, e) \
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long int _e = (long int)(e); \
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LOAD_ARGS_4 (a, b, c, d) \
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register long int __e __asm__ ("r7") = _e;
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#define ASM_ARGS_5 ASM_ARGS_4, "r" (__e)
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#define ASM_CLOBBERS_5 "r8", ASM_CLOBBERS_6
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#define LOAD_ARGS_6(a, b, c, d, e, f) \
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long int _f = (long int)(f); \
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LOAD_ARGS_5 (a, b, c, d, e) \
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register long int __f __asm__ ("r8") = _f;
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#define ASM_ARGS_6 ASM_ARGS_5, "r" (__f)
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#define ASM_CLOBBERS_6
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#endif /* not __ASSEMBLER__ */
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#endif /* linux/or1k/sysdep.h */
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