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210 lines
7.3 KiB
C
210 lines
7.3 KiB
C
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 !defined NOT_IN_libc || defined IS_IN_libpthread
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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L(name##START): \
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SINGLE_THREAD_P; \
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jne L(pseudo_cancel); \
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DO_CALL (syscall_name, args); \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL; \
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ret; \
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L(pseudo_cancel): \
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/* Save registers that might get destroyed. */ \
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SAVESTK_##args \
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PUSHARGS_##args \
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CENABLE \
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/* Restore registers. */ \
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POPARGS_##args \
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/* The return value from CENABLE is argument for CDISABLE. */ \
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movq %rax, (%rsp); \
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movq $SYS_ify (syscall_name), %rax; \
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syscall; \
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movq (%rsp), %rdi; \
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/* Save %rax since it's the error code from the syscall. */ \
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movq %rax, 8(%rsp); \
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CDISABLE \
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movq 8(%rsp), %rax; \
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RESTSTK_##args \
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cmpq $-4095, %rax; \
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jae SYSCALL_ERROR_LABEL; \
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L(pseudo_end): \
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\
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/* Create unwinding information for the syscall wrapper. */ \
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.section .eh_frame,"a",@progbits; \
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L(STARTFRAME): \
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/* Length of the CIE. */ \
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.long L(ENDCIE)-L(STARTCIE); \
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L(STARTCIE): \
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/* CIE ID. */ \
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.long 0; \
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/* Version number. */ \
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.byte 1; \
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/* NUL-terminated augmentation string. Note "z" means there is an \
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augmentation value later on. */ \
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.string "zR"; \
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/* Code alignment factor. */ \
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.uleb128 1; \
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/* Data alignment factor. */ \
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.sleb128 -8; \
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/* Return address register column. */ \
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.byte 16; \
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/* Augmentation value length. */ \
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.uleb128 1; \
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/* Encoding: DW_EH_PE_pcrel + DW_EH_PE_sdata4. */ \
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.byte 0x1b; \
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/* Start of the table initialization. */ \
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.byte 0xc; \
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.uleb128 7; \
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.uleb128 8; \
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.byte 0x90; \
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.uleb128 1; \
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.align 8; \
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L(ENDCIE): \
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/* Length of the FDE. */ \
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.long L(ENDFDE)-L(STARTFDE); \
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L(STARTFDE): \
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/* CIE pointer. */ \
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.long L(STARTFDE)-L(STARTFRAME); \
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/* PC-relative start address of the code. */ \
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.long L(name##START)-.; \
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/* Length of the code. */ \
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.long L(name##END)-L(name##START); \
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/* No augmentation data. */ \
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.uleb128 0; \
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/* The rest of the code depends on the number of parameters the syscall \
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takes. */ \
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EH_FRAME_##args(name); \
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.align 4; \
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L(ENDFDE): \
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.previous
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# define EH_FRAME_0(name) \
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.byte 4; \
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.long L(SAVESTK)-L(name##START); \
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.byte 14; \
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.uleb128 32; \
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.byte 4; \
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.long L(RESTSTK)-L(SAVESTK); \
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.byte 14; \
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.uleb128 8; \
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.align 8
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# define EH_FRAME_1(name) EH_FRAME_0 (name)
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# define EH_FRAME_2(name) EH_FRAME_1 (name)
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# define EH_FRAME_3(name) \
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.byte 4; \
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.long L(SAVESTK)-L(name##START); \
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.byte 14; \
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.uleb128 48; \
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.byte 4; \
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.long L(RESTSTK)-L(SAVESTK); \
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.byte 14; \
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.uleb128 8; \
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.align 8
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# define EH_FRAME_4(name) EH_FRAME_3 (name)
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# define EH_FRAME_5(name) \
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.byte 4; \
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.long L(SAVESTK)-L(name##START); \
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.byte 14; \
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.uleb128 64; \
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.byte 4; \
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.long L(RESTSTK)-L(SAVESTK); \
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.byte 14; \
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.uleb128 8; \
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.align 8
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# define EH_FRAME_6(name) EH_FRAME_5 (name)
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# undef ASM_SIZE_DIRECTIVE
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# define ASM_SIZE_DIRECTIVE(name) L(name##END): .size name,.-name;
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# define PUSHARGS_0 /* Nothing. */
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# define PUSHARGS_1 PUSHARGS_0 movq %rdi, 8(%rsp);
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# define PUSHARGS_2 PUSHARGS_1 movq %rsi, 16(%rsp);
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# define PUSHARGS_3 PUSHARGS_2 movq %rdx, 24(%rsp);
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# define PUSHARGS_4 PUSHARGS_3 movq %rcx, 32(%rsp);
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# define PUSHARGS_5 PUSHARGS_4 movq %r8, 40(%rsp);
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# define PUSHARGS_6 PUSHARGS_5 movq %r9, 48(%rsp);
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# define POPARGS_0 /* Nothing. */
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# define POPARGS_1 POPARGS_0 movq 8(%rsp), %rdi;
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# define POPARGS_2 POPARGS_1 movq 16(%rsp), %rsi;
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# define POPARGS_3 POPARGS_2 movq 24(%rsp), %rdx;
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# define POPARGS_4 POPARGS_3 movq 32(%rsp), %r10;
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# define POPARGS_5 POPARGS_4 movq 40(%rsp), %r8;
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# define POPARGS_6 POPARGS_5 movq 48(%rsp), %r9;
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/* We always have to align the stack before calling a function. */
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# define SAVESTK_0 subq $24, %rsp; L(SAVESTK):
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# define SAVESTK_1 SAVESTK_0
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# define SAVESTK_2 SAVESTK_1
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# define SAVESTK_3 subq $40, %rsp; L(SAVESTK):
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# define SAVESTK_4 SAVESTK_3
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# define SAVESTK_5 subq $56, %rsp; L(SAVESTK):
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# define SAVESTK_6 SAVESTK_5
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# define RESTSTK_0 addq $24,%rsp; L(RESTSTK):
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# define RESTSTK_1 RESTSTK_0
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# define RESTSTK_2 RESTSTK_1
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# define RESTSTK_3 addq $40, %rsp; L(RESTSTK):
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# define RESTSTK_4 RESTSTK_3
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# define RESTSTK_5 addq $56, %rsp; L(RESTSTK):
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# define RESTSTK_6 RESTSTK_5
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# ifdef IS_IN_libpthread
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# define CENABLE call __pthread_enable_asynccancel;
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# define CDISABLE call __pthread_disable_asynccancel;
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# define __local_multiple_threads __pthread_multiple_threads
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# else
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# define CENABLE call __libc_enable_asynccancel;
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# define CDISABLE call __libc_disable_asynccancel;
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# define __local_multiple_threads __libc_multiple_threads
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# endif
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# ifndef __ASSEMBLER__
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extern int __local_multiple_threads attribute_hidden;
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# define SINGLE_THREAD_P \
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__builtin_expect (__local_multiple_threads == 0, 1)
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# else
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# define SINGLE_THREAD_P cmpl $0, __local_multiple_threads(%rip)
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# endif
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#elif !defined __ASSEMBLER__
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/* This code should never be used but we define it anyhow. */
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# define SINGLE_THREAD_P (1)
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#endif
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