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From a55c46c1d27e0ac6e680d5088fb378dc7986a3e2 Mon Sep 17 00:00:00 2001
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From: Peter Maydell <peter.maydell@linaro.org>
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Date: Tue, 17 Dec 2013 19:42:32 +0000
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Subject: [PATCH 27/49] target-arm: Support fp registers in gdb stub
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Register the aarch64-fpu XML and implement the necessary
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read/write handlers so we can support reading and writing
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of FP registers in the gdb stub.
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Richard Henderson <rth@twiddle.net>
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gdb-xml/aarch64-fpu.xml | 86 +++++++++++++++++++++++++++++++++++++++++++++++++
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target-arm/helper.c | 48 ++++++++++++++++++++++++++-
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3 files changed, 134 insertions(+), 2 deletions(-)
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create mode 100644 gdb-xml/aarch64-fpu.xml
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diff --git a/configure b/configure
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index 72432ef..76c0b8d 100755
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@@ -4406,7 +4406,7 @@ case "$target_name" in
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- gdb_xml_files="aarch64-core.xml"
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+ gdb_xml_files="aarch64-core.xml aarch64-fpu.xml"
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diff --git a/gdb-xml/aarch64-fpu.xml b/gdb-xml/aarch64-fpu.xml
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index 0000000..997197e
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+++ b/gdb-xml/aarch64-fpu.xml
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+<?xml version="1.0"?>
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+<!-- Copyright (C) 2009-2012 Free Software Foundation, Inc.
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+ Contributed by ARM Ltd.
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+ Copying and distribution of this file, with or without modification,
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+ are permitted in any medium without royalty provided the copyright
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+ notice and this notice are preserved. -->
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+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
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+<feature name="org.gnu.gdb.aarch64.fpu">
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+ <vector id="v2d" type="ieee_double" count="2"/>
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+ <vector id="v2u" type="uint64" count="2"/>
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+ <vector id="v2i" type="int64" count="2"/>
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+ <vector id="v4f" type="ieee_single" count="4"/>
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+ <vector id="v4u" type="uint32" count="4"/>
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+ <vector id="v4i" type="int32" count="4"/>
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+ <vector id="v8u" type="uint16" count="8"/>
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+ <vector id="v8i" type="int16" count="8"/>
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+ <vector id="v16u" type="uint8" count="16"/>
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+ <vector id="v16i" type="int8" count="16"/>
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+ <vector id="v1u" type="uint128" count="1"/>
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+ <vector id="v1i" type="int128" count="1"/>
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+ <field name="f" type="v2d"/>
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+ <field name="u" type="v2u"/>
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+ <field name="s" type="v2i"/>
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+ <field name="f" type="v4f"/>
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+ <field name="u" type="v4u"/>
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+ <field name="s" type="v4i"/>
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+ <field name="u" type="v8u"/>
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+ <field name="s" type="v8i"/>
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+ <field name="u" type="v16u"/>
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+ <field name="s" type="v16i"/>
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+ <field name="u" type="v1u"/>
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+ <field name="s" type="v1i"/>
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+ <union id="aarch64v">
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+ <field name="d" type="vnd"/>
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+ <field name="s" type="vns"/>
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+ <field name="h" type="vnh"/>
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+ <field name="b" type="vnb"/>
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+ <field name="q" type="vnq"/>
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+ <reg name="v0" bitsize="128" type="aarch64v" regnum="34"/>
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+ <reg name="v1" bitsize="128" type="aarch64v" />
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+ <reg name="v2" bitsize="128" type="aarch64v" />
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+ <reg name="v3" bitsize="128" type="aarch64v" />
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+ <reg name="v4" bitsize="128" type="aarch64v" />
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+ <reg name="v5" bitsize="128" type="aarch64v" />
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+ <reg name="v6" bitsize="128" type="aarch64v" />
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+ <reg name="v7" bitsize="128" type="aarch64v" />
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+ <reg name="v8" bitsize="128" type="aarch64v" />
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+ <reg name="v9" bitsize="128" type="aarch64v" />
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+ <reg name="v10" bitsize="128" type="aarch64v"/>
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+ <reg name="v11" bitsize="128" type="aarch64v"/>
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+ <reg name="v12" bitsize="128" type="aarch64v"/>
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+ <reg name="v13" bitsize="128" type="aarch64v"/>
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+ <reg name="v14" bitsize="128" type="aarch64v"/>
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+ <reg name="v15" bitsize="128" type="aarch64v"/>
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+ <reg name="v16" bitsize="128" type="aarch64v"/>
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+ <reg name="v17" bitsize="128" type="aarch64v"/>
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+ <reg name="v18" bitsize="128" type="aarch64v"/>
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+ <reg name="v19" bitsize="128" type="aarch64v"/>
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+ <reg name="v20" bitsize="128" type="aarch64v"/>
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+ <reg name="v21" bitsize="128" type="aarch64v"/>
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+ <reg name="v22" bitsize="128" type="aarch64v"/>
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+ <reg name="v23" bitsize="128" type="aarch64v"/>
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+ <reg name="v24" bitsize="128" type="aarch64v"/>
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+ <reg name="v25" bitsize="128" type="aarch64v"/>
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+ <reg name="v26" bitsize="128" type="aarch64v"/>
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+ <reg name="v27" bitsize="128" type="aarch64v"/>
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+ <reg name="v28" bitsize="128" type="aarch64v"/>
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+ <reg name="v29" bitsize="128" type="aarch64v"/>
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+ <reg name="v30" bitsize="128" type="aarch64v"/>
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+ <reg name="v31" bitsize="128" type="aarch64v"/>
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+ <reg name="fpsr" bitsize="32"/>
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+ <reg name="fpcr" bitsize="32"/>
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diff --git a/target-arm/helper.c b/target-arm/helper.c
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index 8ec4cb1..7f8177e 100644
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--- a/target-arm/helper.c
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+++ b/target-arm/helper.c
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@@ -65,6 +65,48 @@ static int vfp_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
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+static int aarch64_fpu_gdb_get_reg(CPUARMState *env, uint8_t *buf, int reg)
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+ /* 128 bit FP register */
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+ stfq_le_p(buf, env->vfp.regs[reg * 2]);
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+ stfq_le_p(buf + 8, env->vfp.regs[reg * 2 + 1]);
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+ stl_p(buf, vfp_get_fpsr(env));
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+ stl_p(buf, vfp_get_fpcr(env));
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+static int aarch64_fpu_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
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+ /* 128 bit FP register */
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+ env->vfp.regs[reg * 2] = ldfq_le_p(buf);
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+ env->vfp.regs[reg * 2 + 1] = ldfq_le_p(buf + 8);
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+ vfp_set_fpsr(env, ldl_p(buf));
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+ vfp_set_fpcr(env, ldl_p(buf));
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static int raw_read(CPUARMState *env, const ARMCPRegInfo *ri,
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@@ -1785,7 +1827,11 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu)
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CPUState *cs = CPU(cpu);
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CPUARMState *env = &cpu->env;
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- if (arm_feature(env, ARM_FEATURE_NEON)) {
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+ if (arm_feature(env, ARM_FEATURE_AARCH64)) {
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+ gdb_register_coprocessor(cs, aarch64_fpu_gdb_get_reg,
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+ aarch64_fpu_gdb_set_reg,
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+ 34, "aarch64-fpu.xml", 0);
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+ } else if (arm_feature(env, ARM_FEATURE_NEON)) {
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gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg,
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51, "arm-neon.xml", 0);
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} else if (arm_feature(env, ARM_FEATURE_VFP3)) {