Function for reading the Aarch64 SVE vector length
Returns 0 for systems without SVE support. Note the defines taken from Linux kernel headers in aarch64-sve-linux-ptrace.h. gdb/ * Makefile.in: Add new header. * gdb/arch/aarch64.h (sve_vg_from_vl): New macro. (sve_vl_from_vg): Likewise. (sve_vq_from_vl): Likewise. (sve_vl_from_vq): Likewise. (sve_vq_from_vg): Likewise. (sve_vg_from_vq): Likewise. * configure.nat: Add new c file. * nat/aarch64-sve-linux-ptrace.c: New file. * nat/aarch64-sve-linux-ptrace.h: New file. gdbserver/ * configure.srv: Add new c/h file.
This commit is contained in:
Alan Hayward
parent
95228a0d79
commit
122394f147
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@ -1,3 +1,16 @@
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2018-05-31 Alan Hayward <alan.hayward@arm.com>
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* Makefile.in: Add new header.
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* gdb/arch/aarch64.h (sve_vg_from_vl): New macro.
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(sve_vl_from_vg): Likewise.
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(sve_vq_from_vl): Likewise.
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(sve_vl_from_vq): Likewise.
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(sve_vq_from_vg): Likewise.
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(sve_vg_from_vq): Likewise.
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* configure.nat: Add new c file.
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* nat/aarch64-sve-linux-ptrace.c: New file.
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* nat/aarch64-sve-linux-ptrace.h: New file.
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2018-05-31 Alan Hayward <alan.hayward@arm.com>
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* aarch64-linux-nat.c (aarch64_linux_read_description):
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@ -1483,6 +1483,7 @@ HFILES_NO_SRCDIR = \
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mi/mi-parse.h \
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nat/aarch64-linux.h \
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nat/aarch64-linux-hw-point.h \
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nat/aarch64-sve-linux-ptrace.h \
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nat/amd64-linux-siginfo.h \
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nat/gdb_ptrace.h \
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nat/gdb_thread_db.h \
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@ -52,6 +52,23 @@ enum aarch64_regnum
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#define AARCH64_V_REGS_NUM 32
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#define AARCH64_NUM_REGS AARCH64_FPCR_REGNUM + 1
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/* There are a number of ways of expressing the current SVE vector size:
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VL : Vector Length.
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The number of bytes in an SVE Z register.
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VQ : Vector Quotient.
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The number of 128bit chunks in an SVE Z register.
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VG : Vector Gradient.
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The number of 64bit chunks in an SVE Z register. */
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#define sve_vg_from_vl(vl) ((vl) / 8)
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#define sve_vl_from_vg(vg) ((vg) * 8)
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#define sve_vq_from_vl(vl) ((vl) / 0x10)
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#define sve_vl_from_vq(vq) ((vq) * 0x10)
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#define sve_vq_from_vg(vg) (sve_vq_from_vl (sve_vl_from_vg (vg)))
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#define sve_vg_from_vq(vq) (sve_vg_from_vl (sve_vl_from_vq (vq)))
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/* Maximum supported VQ value. Increase if required. */
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#define AARCH64_MAX_SVE_VQ 16
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@ -228,7 +228,8 @@ case ${gdb_host} in
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aarch64)
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# Host: AArch64 based machine running GNU/Linux
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NATDEPFILES="${NATDEPFILES} aarch64-linux-nat.o \
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aarch32-linux-nat.o aarch64-linux-hw-point.o aarch64-linux.o"
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aarch32-linux-nat.o aarch64-linux-hw-point.o aarch64-linux.o \
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aarch64-sve-linux-ptrace.o"
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;;
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arm)
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# Host: ARM based machine running GNU/Linux
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@ -1,3 +1,7 @@
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2018-05-31 Alan Hayward <alan.hayward@arm.com>
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* configure.srv: Add new c/h file.
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2018-05-31 Alan Hayward <alan.hayward@arm.com>
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* linux-aarch64-tdesc.c (aarch64_linux_read_description): Add
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@ -54,6 +54,7 @@ case "${target}" in
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srv_tgtobj="$srv_tgtobj arch/aarch64-insn.o"
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srv_tgtobj="$srv_tgtobj arch/aarch64.o"
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srv_tgtobj="$srv_tgtobj linux-aarch64-tdesc.o"
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srv_tgtobj="$srv_tgtobj aarch64-sve-linux-ptrace.o"
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srv_tgtobj="${srv_tgtobj} $srv_linux_obj"
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srv_linux_regsets=yes
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srv_linux_thread_db=yes
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@ -0,0 +1,58 @@
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/* Common target dependent for AArch64 systems.
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Copyright (C) 2018 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 <sys/utsname.h>
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#include <sys/uio.h>
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#include "common-defs.h"
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#include "elf/external.h"
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#include "elf/common.h"
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#include "aarch64-sve-linux-ptrace.h"
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#include "arch/aarch64.h"
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/* See nat/aarch64-sve-linux-ptrace.h. */
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unsigned long
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aarch64_sve_get_vq (int tid)
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{
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struct iovec iovec;
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struct user_sve_header header;
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iovec.iov_len = sizeof (header);
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iovec.iov_base = &header;
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/* Ptrace gives the vector length in bytes. Convert it to VQ, the number of
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128bit chunks in a Z register. We use VQ because 128bits is the minimum
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a Z register can increase in size. */
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if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_SVE, &iovec) < 0)
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{
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/* SVE is not supported. */
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return 0;
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}
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long vq = sve_vq_from_vl (header.vl);
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if (!sve_vl_valid (header.vl))
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{
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warning (_("Invalid SVE state from kernel; SVE disabled."));
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return 0;
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}
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return vq;
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}
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@ -0,0 +1,73 @@
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/* Common target dependent for AArch64 systems.
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Copyright (C) 2018 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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#ifndef AARCH64_SVE_LINUX_PTRACE_H
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#define AARCH64_SVE_LINUX_PTRACE_H
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/* Where indicated, this file contains defines and macros lifted directly from
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the Linux kernel headers, with no modification.
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Refer to Linux kernel documentation for details. */
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#include <asm/sigcontext.h>
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#include <sys/utsname.h>
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#include <sys/ptrace.h>
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#include <asm/ptrace.h>
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/* Read VQ for the given tid using ptrace. If SVE is not supported then zero
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is returned (on a system that supports SVE, then VQ cannot be zero). */
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extern unsigned long aarch64_sve_get_vq (int tid);
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/* Structures and defines taken from sigcontext.h. */
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#ifndef SVE_SIG_ZREGS_SIZE
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#define SVE_VQ_BYTES 16 /* number of bytes per quadword */
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#define SVE_VQ_MIN 1
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#define SVE_VQ_MAX 512
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#define SVE_VL_MIN (SVE_VQ_MIN * SVE_VQ_BYTES)
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#define SVE_VL_MAX (SVE_VQ_MAX * SVE_VQ_BYTES)
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#define SVE_NUM_ZREGS 32
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#define SVE_NUM_PREGS 16
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#define sve_vl_valid(vl) \
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((vl) % SVE_VQ_BYTES == 0 && (vl) >= SVE_VL_MIN && (vl) <= SVE_VL_MAX)
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#endif /* SVE_SIG_ZREGS_SIZE. */
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/* Structures and defines taken from ptrace.h. */
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#ifndef SVE_PT_SVE_ZREG_SIZE
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struct user_sve_header {
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__u32 size; /* total meaningful regset content in bytes */
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__u32 max_size; /* maxmium possible size for this thread */
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__u16 vl; /* current vector length */
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__u16 max_vl; /* maximum possible vector length */
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__u16 flags;
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__u16 __reserved;
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};
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#endif /* SVE_PT_SVE_ZREG_SIZE. */
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#endif /* aarch64-sve-linux-ptrace.h */
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