| /* Copyright (C) 2003-2014 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 <sysdeps/generic/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 __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 |
| |
| # 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 |
| # 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 |
