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/* Common Linux arch-specific functionality for AArch64 scalable
extensions: SVE and SME.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "arch/aarch64-scalable-linux.h"
#include "arch/aarch64.h"
#include "gdbsupport/byte-vector.h"
#include "gdbsupport/common-regcache.h"
/* See arch/aarch64-scalable-linux.h */
bool
sve_state_is_empty (const struct reg_buffer_common *reg_buf)
{
/* Instead of allocating a buffer with the size of the current vector
length, just use a buffer that is big enough for all cases. */
gdb_byte zero_buffer[256];
/* Zero it out. */
memset (zero_buffer, 0, 256);
/* Are any of the Z registers set (non-zero) after the first 128 bits? */
for (int i = 0; i < AARCH64_SVE_Z_REGS_NUM; i++)
{
if (!reg_buf->raw_compare (AARCH64_SVE_Z0_REGNUM + i, zero_buffer,
V_REGISTER_SIZE))
return false;
}
/* Are any of the P registers set (non-zero)? */
for (int i = 0; i < AARCH64_SVE_P_REGS_NUM; i++)
{
if (!reg_buf->raw_compare (AARCH64_SVE_P0_REGNUM + i, zero_buffer, 0))
return false;
}
/* Is the FFR register set (non-zero)? */
return reg_buf->raw_compare (AARCH64_SVE_FFR_REGNUM, zero_buffer, 0);
}
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