From dbd9e08476f09cf3556b9b8a306bf277172841a9 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 1 Nov 2021 16:08:14 +0000 Subject: target/arm: Advertise MVE to gdb when present MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cortex-M CPUs with MVE should advertise this fact to gdb, using the org.gnu.gdb.arm.m-profile-mve XML feature, which defines the VPR register. Presence of this feature also tells gdb to create pseudo-registers Q0..Q7, so we do not need to tell gdb about them separately. Note that unless you have a very recent GDB that includes this fix: http://patches-tcwg.linaro.org/patch/58133/ gdb will mis-print the individual fields of the VPR register as zero (but showing the whole thing as hex, eg with "print /x $vpr" will give the correct value). Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20211101160814.5103-1-peter.maydell@linaro.org> Signed-off-by: Richard Henderson --- target/arm/gdbstub.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'target/arm') diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c index e0dcb33..134da0d 100644 --- a/target/arm/gdbstub.c +++ b/target/arm/gdbstub.c @@ -199,6 +199,27 @@ static int vfp_gdb_set_sysreg(CPUARMState *env, uint8_t *buf, int reg) return 0; } +static int mve_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg) +{ + switch (reg) { + case 0: + return gdb_get_reg32(buf, env->v7m.vpr); + default: + return 0; + } +} + +static int mve_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg) +{ + switch (reg) { + case 0: + env->v7m.vpr = ldl_p(buf); + return 4; + default: + return 0; + } +} + /** * arm_get/set_gdb_*: get/set a gdb register * @env: the CPU state @@ -468,6 +489,10 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu) 2, "arm-vfp-sysregs.xml", 0); } } + if (cpu_isar_feature(aa32_mve, cpu)) { + gdb_register_coprocessor(cs, mve_gdb_get_reg, mve_gdb_set_reg, + 1, "arm-m-profile-mve.xml", 0); + } gdb_register_coprocessor(cs, arm_gdb_get_sysreg, arm_gdb_set_sysreg, arm_gen_dynamic_sysreg_xml(cs, cs->gdb_num_regs), "system-registers.xml", 0); -- cgit v1.1