| /* Cancellable system call stubs. Linux/PowerPC64 version. |
| Copyright (C) 2003-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003. |
| |
| 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 <nptl/pthreadP.h> |
| #endif |
| |
| #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt |
| |
| # ifdef HAVE_ASM_GLOBAL_DOT_NAME |
| # define DASHDASHPFX(str) .__##str |
| # else |
| # define DASHDASHPFX(str) __##str |
| # endif |
| |
| #if _CALL_ELF == 2 |
| #define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16+48) |
| #define CANCEL_PARM_SAVE (FRAME_MIN_SIZE+16) |
| #else |
| #define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16) |
| #define CANCEL_PARM_SAVE (CANCEL_FRAMESIZE+FRAME_PARM_SAVE) |
| #endif |
| |
| # undef PSEUDO |
| # define PSEUDO(name, syscall_name, args) \ |
| .section ".text"; \ |
| ENTRY (name) \ |
| SINGLE_THREAD_P; \ |
| bne- .Lpseudo_cancel; \ |
| .type DASHDASHPFX(syscall_name##_nocancel),@function; \ |
| .globl DASHDASHPFX(syscall_name##_nocancel); \ |
| DASHDASHPFX(syscall_name##_nocancel): \ |
| DO_CALL (SYS_ify (syscall_name)); \ |
| PSEUDO_RET; \ |
| .size DASHDASHPFX(syscall_name##_nocancel),.-DASHDASHPFX(syscall_name##_nocancel); \ |
| .Lpseudo_cancel: \ |
| stdu 1,-CANCEL_FRAMESIZE(1); \ |
| cfi_adjust_cfa_offset (CANCEL_FRAMESIZE); \ |
| mflr 9; \ |
| std 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \ |
| cfi_offset (lr, FRAME_LR_SAVE); \ |
| DOCARGS_##args; /* save syscall args around CENABLE. */ \ |
| CENABLE; \ |
| std 3,FRAME_MIN_SIZE(1); /* store CENABLE return value (MASK). */ \ |
| UNDOCARGS_##args; /* restore syscall args. */ \ |
| DO_CALL (SYS_ify (syscall_name)); \ |
| mfcr 0; /* save CR/R3 around CDISABLE. */ \ |
| std 3,FRAME_MIN_SIZE+8(1); \ |
| std 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); \ |
| cfi_offset (cr, FRAME_CR_SAVE); \ |
| ld 3,FRAME_MIN_SIZE(1); /* pass MASK to CDISABLE. */ \ |
| CDISABLE; \ |
| ld 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \ |
| ld 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); /* restore CR/R3. */ \ |
| ld 3,FRAME_MIN_SIZE+8(1); \ |
| mtlr 9; \ |
| mtcr 0; \ |
| addi 1,1,CANCEL_FRAMESIZE; \ |
| cfi_adjust_cfa_offset (-CANCEL_FRAMESIZE); \ |
| cfi_restore (lr); \ |
| cfi_restore (cr) |
| |
| # define DOCARGS_0 |
| # define UNDOCARGS_0 |
| |
| # define DOCARGS_1 std 3,CANCEL_PARM_SAVE(1); DOCARGS_0 |
| # define UNDOCARGS_1 ld 3,CANCEL_PARM_SAVE(1); UNDOCARGS_0 |
| |
| # define DOCARGS_2 std 4,CANCEL_PARM_SAVE+8(1); DOCARGS_1 |
| # define UNDOCARGS_2 ld 4,CANCEL_PARM_SAVE+8(1); UNDOCARGS_1 |
| |
| # define DOCARGS_3 std 5,CANCEL_PARM_SAVE+16(1); DOCARGS_2 |
| # define UNDOCARGS_3 ld 5,CANCEL_PARM_SAVE+16(1); UNDOCARGS_2 |
| |
| # define DOCARGS_4 std 6,CANCEL_PARM_SAVE+24(1); DOCARGS_3 |
| # define UNDOCARGS_4 ld 6,CANCEL_PARM_SAVE+24(1); UNDOCARGS_3 |
| |
| # define DOCARGS_5 std 7,CANCEL_PARM_SAVE+32(1); DOCARGS_4 |
| # define UNDOCARGS_5 ld 7,CANCEL_PARM_SAVE+32(1); UNDOCARGS_4 |
| |
| # define DOCARGS_6 std 8,CANCEL_PARM_SAVE+40(1); DOCARGS_5 |
| # define UNDOCARGS_6 ld 8,CANCEL_PARM_SAVE+40(1); UNDOCARGS_5 |
| |
| # ifdef IS_IN_libpthread |
| # ifdef SHARED |
| # define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel) |
| # define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel) |
| # else |
| # define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel); nop |
| # define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel); nop |
| # endif |
| # elif !defined NOT_IN_libc |
| # ifdef SHARED |
| # define CENABLE bl JUMPTARGET(__libc_enable_asynccancel) |
| # define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel) |
| # else |
| # define CENABLE bl JUMPTARGET(__libc_enable_asynccancel); nop |
| # define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel); nop |
| # endif |
| # elif defined IS_IN_librt |
| # ifdef SHARED |
| # define CENABLE bl JUMPTARGET(__librt_enable_asynccancel) |
| # define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel) |
| # else |
| # define CENABLE bl JUMPTARGET(__librt_enable_asynccancel); nop |
| # define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel); nop |
| # endif |
| # else |
| # error Unsupported library |
| # endif |
| |
| # ifndef __ASSEMBLER__ |
| # define SINGLE_THREAD_P \ |
| __builtin_expect (THREAD_GETMEM (THREAD_SELF, \ |
| header.multiple_threads) == 0, 1) |
| # else |
| # define SINGLE_THREAD_P \ |
| lwz 10,MULTIPLE_THREADS_OFFSET(13); \ |
| cmpwi 10,0 |
| # 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 |