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69bfb2b6d0
This patch enables dumping SME state via gdb's gcore command and also enables gdb to read SME state from a core file generated by the Linux Kernel. Regression-tested on aarch64-linux Ubuntu 22.04/20.04. Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Common Linux arch-specific functionality for AArch64 scalable
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extensions: SVE and SME.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 3 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "arch/aarch64-scalable-linux.h"
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#include "arch/aarch64.h"
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#include "gdbsupport/byte-vector.h"
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#include "gdbsupport/common-regcache.h"
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/* See arch/aarch64-scalable-linux.h */
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bool
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sve_state_is_empty (const struct reg_buffer_common *reg_buf)
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{
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/* Instead of allocating a buffer with the size of the current vector
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length, just use a buffer that is big enough for all cases. */
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gdb_byte zero_buffer[256];
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/* Zero it out. */
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memset (zero_buffer, 0, 256);
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/* Are any of the Z registers set (non-zero) after the first 128 bits? */
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for (int i = 0; i < AARCH64_SVE_Z_REGS_NUM; i++)
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{
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if (!reg_buf->raw_compare (AARCH64_SVE_Z0_REGNUM + i, zero_buffer,
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V_REGISTER_SIZE))
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return false;
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}
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/* Are any of the P registers set (non-zero)? */
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for (int i = 0; i < AARCH64_SVE_P_REGS_NUM; i++)
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{
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if (!reg_buf->raw_compare (AARCH64_SVE_P0_REGNUM + i, zero_buffer, 0))
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return false;
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}
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/* Is the FFR register set (non-zero)? */
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return reg_buf->raw_compare (AARCH64_SVE_FFR_REGNUM, zero_buffer, 0);
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}
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