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glibc/sysdeps/unix/sysv/linux/mips/sysdep-cancel.h

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/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <sysdeps/generic/sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
# ifdef __PIC__
# define PSEUDO_CPLOAD .cpload t9;
# define PSEUDO_ERRJMP la t9, __syscall_error; jr t9;
# define PSEUDO_SAVEGP sw gp, 32(sp); cfi_rel_offset (gp, 32);
# define PSEUDO_LOADGP lw gp, 32(sp);
# else
# define PSEUDO_CPLOAD
# define PSEUDO_ERRJMP j __syscall_error;
# define PSEUDO_SAVEGP
# define PSEUDO_LOADGP
# endif
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.align 2; \
.set nomips16; \
L(pseudo_start): \
cfi_startproc; \
99: PSEUDO_ERRJMP \
.type __##syscall_name##_nocancel, @function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
.set noreorder; \
PSEUDO_CPLOAD \
li v0, SYS_ify(syscall_name); \
syscall; \
.set reorder; \
bne a3, zero, 99b; \
ret; \
cfi_endproc; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
ENTRY (name) \
.set noreorder; \
PSEUDO_CPLOAD \
.set reorder; \
SINGLE_THREAD_P(v1); \
bne zero, v1, L(pseudo_cancel); \
.set noreorder; \
li v0, SYS_ify(syscall_name); \
syscall; \
.set reorder; \
bne a3, zero, 99b; \
ret; \
L(pseudo_cancel): \
SAVESTK_##args; \
sw ra, 28(sp); \
cfi_rel_offset (ra, 28); \
PSEUDO_SAVEGP \
PUSHARGS_##args; /* save syscall args */ \
CENABLE; \
PSEUDO_LOADGP \
sw v0, 44(sp); /* save mask */ \
POPARGS_##args; /* restore syscall args */ \
.set noreorder; \
li v0, SYS_ify (syscall_name); \
syscall; \
.set reorder; \
sw v0, 36(sp); /* save syscall result */ \
sw a3, 40(sp); /* save syscall error flag */ \
lw a0, 44(sp); /* pass mask as arg1 */ \
CDISABLE; \
PSEUDO_LOADGP \
lw v0, 36(sp); /* restore syscall result */ \
lw a3, 40(sp); /* restore syscall error flag */ \
lw ra, 28(sp); /* restore return address */ \
.set noreorder; \
bne a3, zero, 99b; \
RESTORESTK; \
L(pseudo_end): \
.set reorder;
# undef PSEUDO_END
# define PSEUDO_END(sym) cfi_endproc; .end sym; .size sym,.-sym
# define PUSHARGS_0 /* nothing to do */
# define PUSHARGS_1 PUSHARGS_0 sw a0, 0(sp); cfi_rel_offset (a0, 0);
# define PUSHARGS_2 PUSHARGS_1 sw a1, 4(sp); cfi_rel_offset (a1, 4);
# define PUSHARGS_3 PUSHARGS_2 sw a2, 8(sp); cfi_rel_offset (a2, 8);
# define PUSHARGS_4 PUSHARGS_3 sw a3, 12(sp); cfi_rel_offset (a3, 12);
# define PUSHARGS_5 PUSHARGS_4 /* handled by SAVESTK_## */
# define PUSHARGS_6 PUSHARGS_5
# define PUSHARGS_7 PUSHARGS_6
# define POPARGS_0 /* nothing to do */
# define POPARGS_1 POPARGS_0 lw a0, 0(sp);
# define POPARGS_2 POPARGS_1 lw a1, 4(sp);
# define POPARGS_3 POPARGS_2 lw a2, 8(sp);
# define POPARGS_4 POPARGS_3 lw a3, 12(sp);
# define POPARGS_5 POPARGS_4 /* args already in new stackframe */
# define POPARGS_6 POPARGS_5
# define POPARGS_7 POPARGS_6
# define STKSPACE 48
# define SAVESTK_0 subu sp, STKSPACE; cfi_adjust_cfa_offset(STKSPACE)
# define SAVESTK_1 SAVESTK_0
# define SAVESTK_2 SAVESTK_1
# define SAVESTK_3 SAVESTK_2
# define SAVESTK_4 SAVESTK_3
# define SAVESTK_5 lw t0, 16(sp); \
SAVESTK_0; \
sw t0, 16(sp)
# define SAVESTK_6 lw t0, 16(sp); \
lw t1, 20(sp); \
SAVESTK_0; \
sw t0, 16(sp); \
sw t1, 20(sp)
# define SAVESTK_7 lw t0, 16(sp); \
lw t1, 20(sp); \
lw t2, 24(sp); \
SAVESTK_0; \
sw t0, 16(sp); \
sw t1, 20(sp); \
sw t2, 24(sp)
# define RESTORESTK addu sp, STKSPACE; cfi_adjust_cfa_offset(-STKSPACE)
# ifdef __PIC__
/* We use jalr rather than jal. This means that the assembler will not
automatically restore $gp (in case libc has multiple GOTs) so we must
do it manually - which we have to do anyway since we don't use .cprestore.
It also shuts up the assembler warning about not using .cprestore. */
# define PSEUDO_JMP(sym) la t9, sym; jalr t9;
# else
# define PSEUDO_JMP(sym) jal sym;
# endif
# if IS_IN (libpthread)
# define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
# elif IS_IN (librt)
# define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
# else
# define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
# endif
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) \
== 0, 1)
# else
# define SINGLE_THREAD_P(reg) \
READ_THREAD_POINTER(reg); \
lw reg, MULTIPLE_THREADS_OFFSET(reg)
#endif
#elif !defined __ASSEMBLER__
# define SINGLE_THREAD_P 1
# define NO_CANCELLATION 1
#endif
#ifndef __ASSEMBLER__
# define RTLD_SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
#endif
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