motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 23:33:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target/arm: Advertise MVE to gdb when present

Browse source 
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 <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211101160814.5103-1-peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Peter Maydell 2021-11-01 16:08:14 +00:00 • committed by Richard Henderson
parent da2f02b360
commit dbd9e08476
6 changed files with 48 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

25
target/arm/gdbstub.c
View file

@ -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);