From b355f08a3724d3f29e1c177dde3a01b649108f98 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 21 Sep 2021 17:29:00 +0100 Subject: target/arm: Don't put FPEXC and FPSID in org.gnu.gdb.arm.vfp XML Currently we send VFP XML which includes D0..D15 or D0..D31, plus FPSID, FPSCR and FPEXC. The upstream GDB tolerates this, but its definition of this XML feature does not include FPSID or FPEXC. In particular, for M-profile cores there are no FPSID or FPEXC registers, so advertising those is wrong. Move FPSID and FPEXC into their own bit of XML which we only send for A and R profile cores. This brings our definition of the XML org.gnu.gdb.arm.vfp feature into line with GDB's own (at least for non-Neon cores...) and means we don't claim to have FPSID and FPEXC on M-profile. (It seems unlikely to me that any gdbstub users really care about being able to look at FPEXC and FPSID; but we've supplied them to gdb for a decade and it's not hard to keep doing so.) Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-id: 20210921162901.17508-5-peter.maydell@linaro.org --- configs/targets/aarch64-softmmu.mak | 2 +- configs/targets/arm-linux-user.mak | 2 +- configs/targets/arm-softmmu.mak | 2 +- configs/targets/armeb-linux-user.mak | 2 +- gdb-xml/arm-neon.xml | 2 -- gdb-xml/arm-vfp-sysregs.xml | 17 +++++++++++ gdb-xml/arm-vfp.xml | 2 -- gdb-xml/arm-vfp3.xml | 2 -- target/arm/gdbstub.c | 56 +++++++++++++++++++++++++----------- 9 files changed, 61 insertions(+), 26 deletions(-) create mode 100644 gdb-xml/arm-vfp-sysregs.xml diff --git a/configs/targets/aarch64-softmmu.mak b/configs/targets/aarch64-softmmu.mak index 7703127674..13d40b55e6 100644 --- a/configs/targets/aarch64-softmmu.mak +++ b/configs/targets/aarch64-softmmu.mak @@ -1,5 +1,5 @@ TARGET_ARCH=aarch64 TARGET_BASE_ARCH=arm TARGET_SUPPORTS_MTTCG=y -TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml +TARGET_XML_FILES= gdb-xml/aarch64-core.xml gdb-xml/aarch64-fpu.xml gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_NEED_FDT=y diff --git a/configs/targets/arm-linux-user.mak b/configs/targets/arm-linux-user.mak index e741ffd4d3..acecc339e3 100644 --- a/configs/targets/arm-linux-user.mak +++ b/configs/targets/arm-linux-user.mak @@ -1,6 +1,6 @@ TARGET_ARCH=arm TARGET_SYSTBL_ABI=common,oabi TARGET_SYSTBL=syscall.tbl -TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml +TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/configs/targets/arm-softmmu.mak b/configs/targets/arm-softmmu.mak index 84a98f4818..f6c95ba07a 100644 --- a/configs/targets/arm-softmmu.mak +++ b/configs/targets/arm-softmmu.mak @@ -1,4 +1,4 @@ TARGET_ARCH=arm TARGET_SUPPORTS_MTTCG=y -TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml +TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_NEED_FDT=y diff --git a/configs/targets/armeb-linux-user.mak b/configs/targets/armeb-linux-user.mak index 255e44e8b0..662c73d8fb 100644 --- a/configs/targets/armeb-linux-user.mak +++ b/configs/targets/armeb-linux-user.mak @@ -2,6 +2,6 @@ TARGET_ARCH=arm TARGET_SYSTBL_ABI=common,oabi TARGET_SYSTBL=syscall.tbl TARGET_WORDS_BIGENDIAN=y -TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml +TARGET_XML_FILES= gdb-xml/arm-core.xml gdb-xml/arm-vfp.xml gdb-xml/arm-vfp3.xml gdb-xml/arm-vfp-sysregs.xml gdb-xml/arm-neon.xml gdb-xml/arm-m-profile.xml TARGET_HAS_BFLT=y CONFIG_ARM_COMPATIBLE_SEMIHOSTING=y diff --git a/gdb-xml/arm-neon.xml b/gdb-xml/arm-neon.xml index ce3ee03ec4..9dce0a996f 100644 --- a/gdb-xml/arm-neon.xml +++ b/gdb-xml/arm-neon.xml @@ -82,7 +82,5 @@ - - diff --git a/gdb-xml/arm-vfp-sysregs.xml b/gdb-xml/arm-vfp-sysregs.xml new file mode 100644 index 0000000000..c4aa2721c8 --- /dev/null +++ b/gdb-xml/arm-vfp-sysregs.xml @@ -0,0 +1,17 @@ + + + + + + + diff --git a/gdb-xml/arm-vfp.xml b/gdb-xml/arm-vfp.xml index b20881e9a9..ebed5b3d57 100644 --- a/gdb-xml/arm-vfp.xml +++ b/gdb-xml/arm-vfp.xml @@ -23,7 +23,5 @@ - - diff --git a/gdb-xml/arm-vfp3.xml b/gdb-xml/arm-vfp3.xml index 227afd8017..ef391c7144 100644 --- a/gdb-xml/arm-vfp3.xml +++ b/gdb-xml/arm-vfp3.xml @@ -39,7 +39,5 @@ - - diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c index cbf156d192..e0dcb33e32 100644 --- a/target/arm/gdbstub.c +++ b/target/arm/gdbstub.c @@ -144,11 +144,7 @@ static int vfp_gdb_get_reg(CPUARMState *env, GByteArray *buf, int reg) } switch (reg - nregs) { case 0: - return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPSID]); - case 1: return gdb_get_reg32(buf, vfp_get_fpscr(env)); - case 2: - return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPEXC]); } return 0; } @@ -173,12 +169,30 @@ static int vfp_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg) } switch (reg - nregs) { case 0: - env->vfp.xregs[ARM_VFP_FPSID] = ldl_p(buf); + vfp_set_fpscr(env, ldl_p(buf)); return 4; + } + return 0; +} + +static int vfp_gdb_get_sysreg(CPUARMState *env, GByteArray *buf, int reg) +{ + switch (reg) { + case 0: + return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPSID]); case 1: - vfp_set_fpscr(env, ldl_p(buf)); + return gdb_get_reg32(buf, env->vfp.xregs[ARM_VFP_FPEXC]); + } + return 0; +} + +static int vfp_gdb_set_sysreg(CPUARMState *env, uint8_t *buf, int reg) +{ + switch (reg) { + case 0: + env->vfp.xregs[ARM_VFP_FPSID] = ldl_p(buf); return 4; - case 2: + case 1: env->vfp.xregs[ARM_VFP_FPEXC] = ldl_p(buf) & (1 << 30); return 4; } @@ -434,15 +448,25 @@ void arm_cpu_register_gdb_regs_for_features(ARMCPU *cpu) 34, "aarch64-fpu.xml", 0); } #endif - } else if (arm_feature(env, ARM_FEATURE_NEON)) { - gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, - 51, "arm-neon.xml", 0); - } else if (cpu_isar_feature(aa32_simd_r32, cpu)) { - gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, - 35, "arm-vfp3.xml", 0); - } else if (cpu_isar_feature(aa32_vfp_simd, cpu)) { - gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, - 19, "arm-vfp.xml", 0); + } else { + if (arm_feature(env, ARM_FEATURE_NEON)) { + gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, + 49, "arm-neon.xml", 0); + } else if (cpu_isar_feature(aa32_simd_r32, cpu)) { + gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, + 33, "arm-vfp3.xml", 0); + } else if (cpu_isar_feature(aa32_vfp_simd, cpu)) { + gdb_register_coprocessor(cs, vfp_gdb_get_reg, vfp_gdb_set_reg, + 17, "arm-vfp.xml", 0); + } + if (!arm_feature(env, ARM_FEATURE_M)) { + /* + * A and R profile have FP sysregs FPEXC and FPSID that we + * expose to gdb. + */ + gdb_register_coprocessor(cs, vfp_gdb_get_sysreg, vfp_gdb_set_sysreg, + 2, "arm-vfp-sysregs.xml", 0); + } } gdb_register_coprocessor(cs, arm_gdb_get_sysreg, arm_gdb_set_sysreg, arm_gen_dynamic_sysreg_xml(cs, cs->gdb_num_regs), -- cgit v1.2.3