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| author | Richard Henderson | 2021-01-28 13:00:10 +0100 |
|---|---|---|
| committer | Peter Maydell | 2021-01-29 11:47:28 +0100 |
| commit | 54a78718be6dd5fc6b6201f84bef8de5ac3b3802 (patch) | |
| tree | f1e025c5db7a1025c3e1468752c2fadbf6e59ffe /target/arm | |
| parent | target/arm: Implement ID_PFR2 (diff) | |
| download | qemu-54a78718be6dd5fc6b6201f84bef8de5ac3b3802.tar.gz qemu-54a78718be6dd5fc6b6201f84bef8de5ac3b3802.tar.xz qemu-54a78718be6dd5fc6b6201f84bef8de5ac3b3802.zip | |
target/arm: Conditionalize DBGDIDR
Only define the register if it exists for the cpu.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210120031656.737646-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm')
| -rw-r--r-- | target/arm/helper.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index 417777d4be..677a4aa79e 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -6567,11 +6567,21 @@ static void define_debug_regs(ARMCPU *cpu) */ int i; int wrps, brps, ctx_cmps; - ARMCPRegInfo dbgdidr = { - .name = "DBGDIDR", .cp = 14, .crn = 0, .crm = 0, .opc1 = 0, .opc2 = 0, - .access = PL0_R, .accessfn = access_tda, - .type = ARM_CP_CONST, .resetvalue = cpu->isar.dbgdidr, - }; + + /* + * The Arm ARM says DBGDIDR is optional and deprecated if EL1 cannot + * use AArch32. Given that bit 15 is RES1, if the value is 0 then + * the register must not exist for this cpu. + */ + if (cpu->isar.dbgdidr != 0) { + ARMCPRegInfo dbgdidr = { + .name = "DBGDIDR", .cp = 14, .crn = 0, .crm = 0, + .opc1 = 0, .opc2 = 0, + .access = PL0_R, .accessfn = access_tda, + .type = ARM_CP_CONST, .resetvalue = cpu->isar.dbgdidr, + }; + define_one_arm_cp_reg(cpu, &dbgdidr); + } /* Note that all these register fields hold "number of Xs minus 1". */ brps = arm_num_brps(cpu); @@ -6580,7 +6590,6 @@ static void define_debug_regs(ARMCPU *cpu) assert(ctx_cmps <= brps); - define_one_arm_cp_reg(cpu, &dbgdidr); define_arm_cp_regs(cpu, debug_cp_reginfo); if (arm_feature(&cpu->env, ARM_FEATURE_LPAE)) { |