| 1 | /* Copyright (C) 2001-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sysdep.h> |
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| 19 | |
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| 20 | #include <sys/asm.h> |
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| 21 | |
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| 22 | /* Usage: |
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| 23 | long int syscall (syscall_number, arg1, arg2, arg3, arg4, arg5, arg6, arg7) |
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| 24 | |
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| 25 | We need to do some arg shifting, syscall_number will be in v0. */ |
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| 26 | |
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| 27 | |
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| 28 | .text |
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| 29 | NESTED (syscall, SZREG, ra) |
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| 30 | .mask 0x00010000, -SZREG |
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| 31 | .fmask 0x00000000, 0 |
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| 32 | PTR_ADDIU sp, -SZREG |
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| 33 | cfi_adjust_cfa_offset (SZREG) |
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| 34 | REG_S s0, (sp) |
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| 35 | cfi_rel_offset (s0, 0) |
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| 36 | |
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| 37 | move s0, a0 |
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| 38 | move a0, a1 /* shift arg1 - arg7. */ |
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| 39 | move a1, a2 |
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| 40 | move a2, a3 |
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| 41 | move a3, a4 |
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| 42 | move a4, a5 |
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| 43 | move a5, a6 |
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| 44 | move a6, a7 |
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| 45 | |
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| 46 | move v0, s0 /* Syscall number -> v0 */ |
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| 47 | syscall /* Do the system call. */ |
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| 48 | |
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| 49 | REG_L s0, (sp) |
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| 50 | cfi_restore (s0) |
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| 51 | PTR_ADDIU sp, SZREG |
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| 52 | cfi_adjust_cfa_offset (-SZREG) |
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| 53 | bne a3, zero, L(error) |
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| 54 | |
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| 55 | ret |
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| 56 | |
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| 57 | L(error): |
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| 58 | SETUP_GP64_REG (a0, syscall) |
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| 59 | PTR_LA t9, __syscall_error |
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| 60 | RESTORE_GP64_REG |
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| 61 | jr t9 |
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| 62 | |
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| 63 | END (syscall) |
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| 64 | |
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