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148 lines
5.1 KiB
C
148 lines
5.1 KiB
C
/* Cancellable system call stubs. Linux/PowerPC64 version.
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Copyright (C) 2003-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
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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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# define DASHDASHPFX(str) __##str
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#if _CALL_ELF == 2
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#define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16+48)
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#define CANCEL_PARM_SAVE (FRAME_MIN_SIZE+16)
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#else
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#define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16)
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#define CANCEL_PARM_SAVE (CANCEL_FRAMESIZE+FRAME_PARM_SAVE)
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#endif
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.section ".text"; \
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ENTRY (name) \
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SINGLE_THREAD_P; \
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bne- .Lpseudo_cancel; \
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.type DASHDASHPFX(syscall_name##_nocancel),@function; \
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.globl DASHDASHPFX(syscall_name##_nocancel); \
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DASHDASHPFX(syscall_name##_nocancel): \
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DO_CALL (SYS_ify (syscall_name)); \
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PSEUDO_RET; \
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.size DASHDASHPFX(syscall_name##_nocancel),.-DASHDASHPFX(syscall_name##_nocancel); \
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.Lpseudo_cancel: \
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stdu 1,-CANCEL_FRAMESIZE(1); \
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cfi_adjust_cfa_offset (CANCEL_FRAMESIZE); \
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mflr 9; \
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std 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \
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cfi_offset (lr, FRAME_LR_SAVE); \
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DOCARGS_##args; /* save syscall args around CENABLE. */ \
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CENABLE; \
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std 3,FRAME_MIN_SIZE(1); /* store CENABLE return value (MASK). */ \
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UNDOCARGS_##args; /* restore syscall args. */ \
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DO_CALL (SYS_ify (syscall_name)); \
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mfcr 0; /* save CR/R3 around CDISABLE. */ \
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std 3,FRAME_MIN_SIZE+8(1); \
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std 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); \
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cfi_offset (cr, FRAME_CR_SAVE); \
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ld 3,FRAME_MIN_SIZE(1); /* pass MASK to CDISABLE. */ \
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CDISABLE; \
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ld 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \
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ld 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); /* restore CR/R3. */ \
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ld 3,FRAME_MIN_SIZE+8(1); \
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mtlr 9; \
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mtcr 0; \
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addi 1,1,CANCEL_FRAMESIZE; \
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cfi_adjust_cfa_offset (-CANCEL_FRAMESIZE); \
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cfi_restore (lr); \
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cfi_restore (cr)
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# define DOCARGS_0
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# define UNDOCARGS_0
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# define DOCARGS_1 std 3,CANCEL_PARM_SAVE(1); DOCARGS_0
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# define UNDOCARGS_1 ld 3,CANCEL_PARM_SAVE(1); UNDOCARGS_0
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# define DOCARGS_2 std 4,CANCEL_PARM_SAVE+8(1); DOCARGS_1
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# define UNDOCARGS_2 ld 4,CANCEL_PARM_SAVE+8(1); UNDOCARGS_1
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# define DOCARGS_3 std 5,CANCEL_PARM_SAVE+16(1); DOCARGS_2
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# define UNDOCARGS_3 ld 5,CANCEL_PARM_SAVE+16(1); UNDOCARGS_2
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# define DOCARGS_4 std 6,CANCEL_PARM_SAVE+24(1); DOCARGS_3
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# define UNDOCARGS_4 ld 6,CANCEL_PARM_SAVE+24(1); UNDOCARGS_3
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# define DOCARGS_5 std 7,CANCEL_PARM_SAVE+32(1); DOCARGS_4
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# define UNDOCARGS_5 ld 7,CANCEL_PARM_SAVE+32(1); UNDOCARGS_4
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# define DOCARGS_6 std 8,CANCEL_PARM_SAVE+40(1); DOCARGS_5
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# define UNDOCARGS_6 ld 8,CANCEL_PARM_SAVE+40(1); UNDOCARGS_5
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# if IS_IN (libpthread)
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# ifdef SHARED
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# define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel)
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# else
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# define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel); nop
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# define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel); nop
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# endif
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# elif IS_IN (libc)
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# ifdef SHARED
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# define CENABLE bl JUMPTARGET(__libc_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel)
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# else
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# define CENABLE bl JUMPTARGET(__libc_enable_asynccancel); nop
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# define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel); nop
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# endif
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# elif IS_IN (librt)
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# ifdef SHARED
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# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel)
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# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel)
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# else
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# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel); nop
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# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel); nop
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# endif
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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) == 0, 1)
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# else
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# define SINGLE_THREAD_P \
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lwz 10,MULTIPLE_THREADS_OFFSET(13); \
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cmpwi 10,0
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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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