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- /* Copyright (C) 2014 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 <tls.h>
- #ifndef __ASSEMBLER__
- # include <pthreadP.h>
- #endif
- #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
- # undef PSEUDO
- # define PSEUDO(name, syscall_name, args) \
- ENTRY(__##syscall_name##_nocancel); \
- L(pseudo_nocancel): \
- DO_CALL(syscall_name); \
- l.j L(pseudo_finish); \
- l.nop; \
- END(__##syscall_name##_nocancel); \
- ENTRY(name); \
- SINGLE_THREAD_P(r13); \
- l.sfeq r13,r0; \
- l.bnf L(pseudo_nocancel); \
- l.nop; \
- /* Reserve the same amount of stack space, effectivly disregarding \
- * how many args we're supposed to push. This makes the code easier. */ \
- l.addi r1,r1,-28; \
- cfi_adjust_cfa_offset(28); \
- PUSHARGS_##args; /* CENABLE is a function call, save args for syscall. */ \
- CENABLE; \
- l.sw 24(r1),r11; \
- POPARGS_##args; \
- DO_CALL(syscall_name); \
- l.lwz r3,24(r1); /* pass return value from CENABLE to CDISABLE. */ \
- l.sw 24(r1),r11; /* save syscall return value for after CDISABLE. */ \
- CDISABLE; \
- l.lwz r11,24(r1); /* restore syscall return value. */ \
- cfi_adjust_cfa_offset(-28); \
- l.addi r1,r1,28; \
- L(pseudo_finish): \
- /* if -4096 < ret < 0 holds, it's an error */ \
- l.sfgeui r11,0xf001; \
- l.bf L(pseudo_end); \
- l.nop
- # undef PSEUDO_END
- # define PSEUDO_END(name) \
- L(pseudo_end): \
- l.j SYSCALL_ERROR_NAME; \
- l.ori r3,r11,0; \
- END(name)
- # define PUSHARGS_0 /* nothing to do */
- # define PUSHARGS_1 PUSHARGS_0 l.sw 0(r1),r3;
- # define PUSHARGS_2 PUSHARGS_1 l.sw 4(r1),r4;
- # define PUSHARGS_3 PUSHARGS_2 l.sw 8(r1),r5;
- # define PUSHARGS_4 PUSHARGS_3 l.sw 12(r1),r6;
- # define PUSHARGS_5 PUSHARGS_4 l.sw 16(r1),r7;
- # define PUSHARGS_6 PUSHARGS_5 l.sw 20(r1),r8;
- # define POPARGS_0 /* nothing to do */
- # define POPARGS_1 POPARGS_0 l.lwz r3,0(r1);
- # define POPARGS_2 POPARGS_1 l.lwz r4,4(r1);
- # define POPARGS_3 POPARGS_2 l.lwz r5,8(r1);
- # define POPARGS_4 POPARGS_3 l.lwz r6,12(r1);
- # define POPARGS_5 POPARGS_4 l.lwz r7,16(r1);
- # define POPARGS_6 POPARGS_5 l.lwz r8,20(r1);
- # define PSEUDO_JMP(sym) l.jal sym; l.nop;
- # ifdef IS_IN_libpthread
- # define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
- # define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
- # elif defined 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
- /* It's not super nice to have "r10" hardcoded here */
- # define SINGLE_THREAD_P(reg) l.lwz reg, MULTIPLE_THREADS_OFFSET(r10)
- #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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