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227 lines
7.6 KiB
C
227 lines
7.6 KiB
C
/* Assembler macros for ARC.
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Copyright (C) 2020 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_ARC_SYSDEP_H
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#define _LINUX_ARC_SYSDEP_H 1
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#include <sysdeps/arc/sysdep.h>
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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/* "workarounds" for generic code needing to handle 64-bit time_t. */
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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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/* For RTLD_PRIVATE_ERRNO. */
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#include <dl-sysdep.h>
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#include <tls.h>
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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#ifdef __ASSEMBLER__
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/* This is a "normal" system call stub: if there is an error,
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it returns -1 and sets errno. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP \
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brhi r0, -4096, L (call_syscall_err) ASM_LINE_SEP
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# define ret j_s [blink]
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER ASM_LINE_SEP \
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END (name)
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/* --------- Helper for SYSCALL_NOERRNO -----------
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This kind of system call stub never returns an error.
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We return the return value register to the caller unexamined. */
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# undef PSEUDO_NOERRNO
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text ASM_LINE_SEP \
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ENTRY (name) ASM_LINE_SEP \
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DO_CALL (syscall_name, args) ASM_LINE_SEP \
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/* Return the return value register unexamined. Since r0 is both
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syscall return reg and function return reg, no work needed. */
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# define ret_NOERRNO \
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j_s [blink] ASM_LINE_SEP
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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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/* --------- Helper for SYSCALL_ERRVAL -----------
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This kind of system call stub returns the errno code as its return
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value, or zero for success. We may massage the kernel's return value
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to meet that ABI, but we never set errno here. */
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# undef PSEUDO_ERRVAL
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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PSEUDO_NOERRNO(name, syscall_name, args) ASM_LINE_SEP
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/* Don't set errno, return kernel error (in errno form) or zero. */
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# define ret_ERRVAL \
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rsub r0, r0, 0 ASM_LINE_SEP \
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ret_NOERRNO
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# undef PSEUDO_END_ERRVAL
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# define PSEUDO_END_ERRVAL(name) \
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END (name)
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/* To reduce the code footprint, we confine the actual errno access
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to single place in __syscall_error().
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This takes raw kernel error value, sets errno and returns -1. */
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# if IS_IN (libc)
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# define CALL_ERRNO_SETTER_C bl PLTJMP(HIDDEN_JUMPTARGET(__syscall_error))
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# else
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# define CALL_ERRNO_SETTER_C bl PLTJMP(__syscall_error)
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# endif
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# define SYSCALL_ERROR_HANDLER \
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L (call_syscall_err): ASM_LINE_SEP \
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push_s blink ASM_LINE_SEP \
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cfi_adjust_cfa_offset (4) ASM_LINE_SEP \
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cfi_rel_offset (blink, 0) ASM_LINE_SEP \
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CALL_ERRNO_SETTER_C ASM_LINE_SEP \
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pop_s blink ASM_LINE_SEP \
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cfi_adjust_cfa_offset (-4) ASM_LINE_SEP \
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cfi_restore (blink) ASM_LINE_SEP \
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j_s [blink]
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# define DO_CALL(syscall_name, args) \
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mov r8, __NR_##syscall_name ASM_LINE_SEP \
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ARC_TRAP_INSN ASM_LINE_SEP
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# define ARC_TRAP_INSN trap_s 0
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#else /* !__ASSEMBLER__ */
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# define SINGLE_THREAD_BY_GLOBAL 1
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# if IS_IN (libc)
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extern long int __syscall_error (long int);
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hidden_proto (__syscall_error)
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# endif
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# define ARC_TRAP_INSN "trap_s 0 \n\t"
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# undef INTERNAL_SYSCALL_NCS
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# define INTERNAL_SYSCALL_NCS(number, nr_args, args...) \
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({ \
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/* Per ABI, r0 is 1st arg and return reg. */ \
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register long int __ret __asm__("r0"); \
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register long int _sys_num __asm__("r8"); \
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\
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LOAD_ARGS_##nr_args (number, args) \
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\
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__asm__ volatile ( \
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ARC_TRAP_INSN \
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: "+r" (__ret) \
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: "r"(_sys_num) ASM_ARGS_##nr_args \
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: "memory"); \
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\
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__ret; })
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# undef INTERNAL_SYSCALL
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# define INTERNAL_SYSCALL(name, nr, args...) \
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INTERNAL_SYSCALL_NCS(__NR_##name, nr, args)
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/* Macros for setting up inline __asm__ input regs. */
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# define ASM_ARGS_0
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# define ASM_ARGS_1 ASM_ARGS_0, "r" (__ret)
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# define ASM_ARGS_2 ASM_ARGS_1, "r" (_arg2)
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# define ASM_ARGS_3 ASM_ARGS_2, "r" (_arg3)
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# define ASM_ARGS_4 ASM_ARGS_3, "r" (_arg4)
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# define ASM_ARGS_5 ASM_ARGS_4, "r" (_arg5)
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# define ASM_ARGS_6 ASM_ARGS_5, "r" (_arg6)
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# define ASM_ARGS_7 ASM_ARGS_6, "r" (_arg7)
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/* Macros for converting sys-call wrapper args into sys call args. */
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# define LOAD_ARGS_0(nm, arg) \
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_sys_num = (long int) (nm);
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# define LOAD_ARGS_1(nm, arg1) \
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__ret = (long int) (arg1); \
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LOAD_ARGS_0 (nm, arg1)
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/* Note that the use of _tmpX might look superflous, however it is needed
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to ensure that register variables are not clobbered if arg happens to be
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a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
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Also this specific order of recursive calling is important to segregate
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the tmp args evaluation (function call case described above) and assigment
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of register variables. */
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# define LOAD_ARGS_2(nm, arg1, arg2) \
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long int _tmp2 = (long int) (arg2); \
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LOAD_ARGS_1 (nm, arg1) \
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register long int _arg2 __asm__ ("r1") = _tmp2;
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# define LOAD_ARGS_3(nm, arg1, arg2, arg3) \
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long int _tmp3 = (long int) (arg3); \
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LOAD_ARGS_2 (nm, arg1, arg2) \
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register long int _arg3 __asm__ ("r2") = _tmp3;
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#define LOAD_ARGS_4(nm, arg1, arg2, arg3, arg4) \
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long int _tmp4 = (long int) (arg4); \
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LOAD_ARGS_3 (nm, arg1, arg2, arg3) \
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register long int _arg4 __asm__ ("r3") = _tmp4;
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# define LOAD_ARGS_5(nm, arg1, arg2, arg3, arg4, arg5) \
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long int _tmp5 = (long int) (arg5); \
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LOAD_ARGS_4 (nm, arg1, arg2, arg3, arg4) \
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register long int _arg5 __asm__ ("r4") = _tmp5;
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# define LOAD_ARGS_6(nm, arg1, arg2, arg3, arg4, arg5, arg6)\
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long int _tmp6 = (long int) (arg6); \
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LOAD_ARGS_5 (nm, arg1, arg2, arg3, arg4, arg5) \
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register long int _arg6 __asm__ ("r5") = _tmp6;
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# define LOAD_ARGS_7(nm, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
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long int _tmp7 = (int) (arg7); \
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LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6) \
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register long int _arg7 __asm__ ("r6") = _tmp7;
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/* Pointer mangling not yet supported. */
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# define PTR_MANGLE(var) (void) (var)
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# define PTR_DEMANGLE(var) (void) (var)
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#endif /* !__ASSEMBLER__ */
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#endif /* linux/arc/sysdep.h */
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