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178 lines
5.0 KiB
178 lines
5.0 KiB
/**************************************************************************** |
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* Copyright © 2022 Rémi Denis-Courmont. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* FFmpeg 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 |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. |
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*****************************************************************************/ |
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#include "libavutil/riscv/asm.S" |
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#if (__riscv_xlen == 64) |
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const fail_s_reg |
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.asciz "callee-saved integer register clobbered" |
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endconst |
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const fail_fs_reg |
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.asciz "callee-saved floating-point register clobbered" |
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endconst |
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const fail_rsvd_reg |
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.asciz "unallocatable register clobbered" |
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endconst |
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.section .tbss, "waT" |
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.align 3 |
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.hidden checked_func |
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.hidden saved_regs |
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checked_func: |
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.quad 0 |
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saved_regs: |
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/* Space to spill RA, SP, GP, TP, S0-S11 and FS0-FS11 */ |
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.rept 4 + 12 + 12 |
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.quad 0 |
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.endr |
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func checkasm_set_function |
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la.tls.ie t0, checked_func |
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add t0, tp, t0 |
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sd a0, (t0) |
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ret |
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endfunc |
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func checkasm_get_wrapper, v |
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addi sp, sp, -16 |
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sd fp, (sp) |
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sd ra, 8(sp) |
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addi fp, sp, 16 |
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call av_get_cpu_flags |
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andi t0, a0, 8 /* AV_CPU_FLAG_RVV_I32 */ |
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lla a0, 3f |
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beqz t0, 1f |
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lla a0, 2f |
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1: |
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ld ra, 8(sp) |
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ld fp, (sp) |
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addi sp, sp, 16 |
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ret |
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2: /* <-- Entry point with the Vector extension --> */ |
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/* Clobber the vectors */ |
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vsetvli t0, zero, e32, m8, ta, ma |
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li t0, 0xdeadbeef |
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vmv.v.x v0, t0 |
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vmv.v.x v8, t0 |
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vmv.v.x v16, t0 |
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vmv.v.x v24, t0 |
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/* Clobber the vector configuration */ |
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li t0, 0 /* Vector length: zero */ |
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li t1, -1 << 31 /* Vector type: illegal */ |
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vsetvl zero, t0, t1 |
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csrwi vxrm, 3 /* Rounding mode: round-to-odd */ |
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csrwi vxsat, 1 /* Saturation: encountered */ |
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3: /* <-- Entry point without the Vector extension --> */ |
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/* Save RA, unallocatable and callee-saved registers */ |
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la.tls.ie t0, saved_regs |
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add t0, tp, t0 |
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sd ra, (t0) |
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sd sp, 8(t0) |
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sd gp, 16(t0) |
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sd tp, 24(t0) |
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.irp n, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
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sd s\n, (32 + (16 * \n))(t0) |
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fsd fs\n, (40 + (16 * \n))(t0) |
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.endr |
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/* Clobber the stack space right below SP */ |
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li t0, 0xdeadbeef1badf00d |
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.rept 16 |
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addi sp, sp, -16 |
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sd t0, (sp) |
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sd t0, 8(sp) |
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.endr |
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addi sp, sp, 256 |
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/* Clobber the saved and temporary registers */ |
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.irp n, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
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.if (\n > 0 && \n < 7) |
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mv t\n, t0 |
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.endif |
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fmv.d.x ft\n, t0 |
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mv s\n, t0 |
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fmv.d.x fs\n, t0 |
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.endr |
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/* Call the tested function */ |
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la.tls.ie t0, checked_func |
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add t0, tp, t0 |
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ld t1, (t0) |
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sd zero, (t0) |
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jalr t1 |
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/* Check special register values */ |
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la.tls.ie t0, saved_regs |
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add t0, tp, t0 |
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ld t1, 8(t0) |
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bne t1, sp, 5f |
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ld t1, 16(t0) |
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bne t1, gp, 5f |
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ld t1, 24(t0) // If TP was corrupted, we probably will have... |
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bne t1, tp, 5f // ...already crashed before we even get here. |
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/* Check value of saved registers */ |
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li t0, 0xdeadbeef1badf00d |
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.irp n, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
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bne t0, s\n, 6f |
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#ifdef __riscv_float_abi_double |
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/* TODO: check float ABI single too */ |
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fmv.x.d t1, fs\n |
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bne t0, t1, 7f |
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#endif |
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.endr |
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4: |
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/* Restore RA and saved registers */ |
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la.tls.ie t0, saved_regs |
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add t0, tp, t0 |
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ld ra, (t0) |
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.irp n, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
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ld s\n, (32 + (16 * \n))(t0) |
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fld fs\n, (40 + (16 * \n))(t0) |
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.endr |
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ret |
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5: |
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lla a0, fail_rsvd_reg |
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call checkasm_fail_func |
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tail abort /* The test harness would probably crash anyway */ |
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6: |
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lla a0, fail_s_reg |
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call checkasm_fail_func |
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j 4b |
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7: |
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lla a0, fail_fs_reg |
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call checkasm_fail_func |
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j 4b |
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endfunc |
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#endif
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