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142 lines
5.9 KiB
C
142 lines
5.9 KiB
C
/* Assembler macros with cancellation support, Nios II version.
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Copyright (C) 2003-2016 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <tls.h>
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#ifndef __ASSEMBLER__
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# include <nptl/pthreadP.h>
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#endif
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#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.type __##syscall_name##_nocancel, @function; \
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.globl __##syscall_name##_nocancel; \
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__##syscall_name##_nocancel: \
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cfi_startproc; \
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DO_CALL (syscall_name, args); \
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bne r7, zero, SYSCALL_ERROR_LABEL; \
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ret; \
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cfi_endproc; \
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.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
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ENTRY (name) \
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SINGLE_THREAD_P(r2); \
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bne r2, zero, pseudo_cancel; \
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DO_CALL (syscall_name, args); \
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bne r7, zero, SYSCALL_ERROR_LABEL; \
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ret; \
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pseudo_cancel: \
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SAVESTK_##args; /* save syscall args and adjust stack */ \
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SAVEREG(ra, 0); /* save return address */ \
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SAVEREG(r22, 4); /* save GOT pointer */ \
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nextpc r22; \
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1: movhi r2, %hiadj(_gp_got - 1b); \
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addi r2, r2, %lo(_gp_got - 1b); \
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add r22, r22, r2; \
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CENABLE; \
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callr r3; \
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stw r2, 8(sp); /* save mask */ \
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LOADARGS_##args; \
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movi r2, SYS_ify(syscall_name); \
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trap; \
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stw r2, 12(sp); /* save syscall result */ \
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stw r7, 16(sp); /* save syscall error flag */ \
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ldw r4, 8(sp); /* pass mask as argument 1 */ \
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CDISABLE; \
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callr r3; \
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ldw r7, 16(sp); /* restore syscall error flag */ \
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ldw r2, 12(sp); /* restore syscall result */ \
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ldw ra, 0(sp); /* restore return address */ \
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ldw r22, 4(sp); /* restore GOT pointer */ \
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RESTORESTK_##args; \
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bne r7, zero, SYSCALL_ERROR_LABEL;
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# undef PSEUDO_END
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# define PSEUDO_END(sym) \
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SYSCALL_ERROR_HANDLER \
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END (sym)
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#define SAVEREG(REG, LOC) stw REG, LOC(sp); cfi_rel_offset (REG, LOC)
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#define SAVESTK(X) subi sp, sp, X; cfi_adjust_cfa_offset(X)
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#define SAVESTK_0 SAVESTK(20)
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#define SAVEARG_1 SAVEREG(r4, 20)
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#define SAVESTK_1 SAVESTK(24); SAVEARG_1
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#define SAVEARG_2 SAVEREG(r5, 24); SAVEARG_1
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#define SAVESTK_2 SAVESTK(28); SAVEARG_2
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#define SAVEARG_3 SAVEREG(r6, 28); SAVEARG_2
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#define SAVESTK_3 SAVESTK(32); SAVEARG_3
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#define SAVEARG_4 SAVEREG(r7, 32); SAVEARG_3
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#define SAVESTK_4 SAVESTK(36); SAVEARG_4
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#define SAVESTK_5 SAVESTK_4
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#define SAVESTK_6 SAVESTK_5
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#define LOADARGS_0
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#define LOADARGS_1 ldw r4, 20(sp)
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#define LOADARGS_2 LOADARGS_1; ldw r5, 24(sp)
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#define LOADARGS_3 LOADARGS_2; ldw r6, 28(sp)
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#define LOADARGS_4 LOADARGS_3; ldw r7, 32(sp)
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#define LOADARGS_5 LOADARGS_4; ldw r8, 36(sp)
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#define LOADARGS_6 LOADARGS_5; ldw r9, 40(sp)
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#define RESTORESTK(X) addi sp, sp, X; cfi_adjust_cfa_offset(-X)
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#define RESTORESTK_0 RESTORESTK(20)
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#define RESTORESTK_1 RESTORESTK(24)
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#define RESTORESTK_2 RESTORESTK(28)
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#define RESTORESTK_3 RESTORESTK(32)
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#define RESTORESTK_4 RESTORESTK(36)
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#define RESTORESTK_5 RESTORESTK(36)
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#define RESTORESTK_6 RESTORESTK(36)
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# if IS_IN (libpthread)
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# define CENABLE ldw r3, %call(__pthread_enable_asynccancel)(r22)
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# define CDISABLE ldw r3, %call(__pthread_disable_asynccancel)(r22)
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# elif IS_IN (librt)
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# define CENABLE ldw r3, %call(__librt_enable_asynccancel)(r22)
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# define CDISABLE ldw r3, %call(__librt_disable_asynccancel)(r22)
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# elif IS_IN (libc)
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# define CENABLE ldw r3, %call(__libc_enable_asynccancel)(r22)
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# define CDISABLE ldw r3, %call(__libc_disable_asynccancel)(r22)
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# else
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# error Unsupported library
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# endif
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# ifndef __ASSEMBLER__
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# define SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) \
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== 0, 1)
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# else
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# define SINGLE_THREAD_P(reg) \
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ldw reg, MULTIPLE_THREADS_OFFSET(r23)
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#endif
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#elif !defined __ASSEMBLER__
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# define SINGLE_THREAD_P 1
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# define NO_CANCELLATION 1
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#endif
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#ifndef __ASSEMBLER__
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# define RTLD_SINGLE_THREAD_P \
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__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
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header.multiple_threads) == 0, 1)
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#endif
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