| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2005 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #include <sys/syscall.h> |
| 20 | #include <bits/arm_asm.h> |
| 21 | |
| 22 | /* In the EABI syscall interface, we don't need a special syscall to |
| 23 | implement syscall(). It won't work reliably with 64-bit arguments |
| 24 | (but that is true on many modern platforms). */ |
| 25 | |
| 26 | .text |
| 27 | .global syscall |
| 28 | .type syscall,%function |
| 29 | .align 4 |
| 30 | #if defined(THUMB1_ONLY) |
| 31 | .thumb_func |
| 32 | syscall: |
| 33 | push {r4, r5, r6, r7} |
| 34 | mov ip, r0 |
| 35 | mov r0, r1 |
| 36 | mov r1, r2 |
| 37 | mov r2, r3 |
| 38 | add r7, sp, #(4 * 4) |
| 39 | ldmia r7!, {r3, r4, r5, r6} |
| 40 | mov r7, ip |
| 41 | swi 0x0 |
| 42 | pop {r4, r5, r6, r7} |
| 43 | ldr r1, =0xfffff000 |
| 44 | cmp r0, r1 |
| 45 | bcs 1f |
| 46 | bx lr |
| 47 | 1: |
| 48 | push {r3, lr} |
| 49 | bl __syscall_error |
| 50 | POP_RET |
| 51 | .pool |
| 52 | #else |
| 53 | syscall: |
| 54 | mov ip, sp |
| 55 | stmfd sp!, {r4, r5, r6, r7} |
| 56 | mov r7, r0 |
| 57 | mov r0, r1 |
| 58 | mov r1, r2 |
| 59 | mov r2, r3 |
| 60 | ldmfd ip, {r3, r4, r5, r6} |
| 61 | swi 0x0 |
| 62 | ldmfd sp!, {r4, r5, r6, r7} |
| 63 | cmn r0, #4096 |
| 64 | IT(t, cc) |
| 65 | #if defined(__USE_BX__) |
| 66 | bxcc lr |
| 67 | #else |
| 68 | movcc pc, lr |
| 69 | #endif |
| 70 | b __syscall_error |
| 71 | #endif |
| 72 | |
| 73 | .size syscall,.-syscall |