From a4c88675d602e161e6048ec3d58e97df77a349ec Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Sun, 17 Apr 2022 10:43:36 -0700 Subject: [PATCH] target/arm: Remove fpexc32_access This function is incorrect in that it does not properly consider CPTR_EL2.FPEN. We've already got another mechanism for raising an FPU access trap: ARM_CP_FPU, so use that instead. Remove CP_ACCESS_TRAP_FP_EL{2,3}, which becomes unused. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- target/arm/cpu.h | 5 ----- target/arm/helper.c | 17 ++--------------- target/arm/op_helper.c | 13 ------------- 3 files changed, 2 insertions(+), 33 deletions(-) diff --git a/target/arm/cpu.h b/target/arm/cpu.h index d2a34f6ea8..db8ff04449 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -2807,11 +2807,6 @@ typedef enum CPAccessResult { /* As CP_ACCESS_UNCATEGORIZED, but for traps directly to EL2 or EL3 */ CP_ACCESS_TRAP_UNCATEGORIZED_EL2 = 5, CP_ACCESS_TRAP_UNCATEGORIZED_EL3 = 6, - /* Access fails and results in an exception syndrome for an FP access, - * trapped directly to EL2 or EL3 - */ - CP_ACCESS_TRAP_FP_EL2 = 7, - CP_ACCESS_TRAP_FP_EL3 = 8, } CPAccessResult; /* Access functions for coprocessor registers. These cannot fail and diff --git a/target/arm/helper.c b/target/arm/helper.c index f1e91b197e..63397bbac1 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -4784,18 +4784,6 @@ static void sctlr_write(CPUARMState *env, const ARMCPRegInfo *ri, } } -static CPAccessResult fpexc32_access(CPUARMState *env, const ARMCPRegInfo *ri, - bool isread) -{ - if ((env->cp15.cptr_el[2] & CPTR_TFP) && arm_current_el(env) == 2) { - return CP_ACCESS_TRAP_FP_EL2; - } - if (env->cp15.cptr_el[3] & CPTR_TFP) { - return CP_ACCESS_TRAP_FP_EL3; - } - return CP_ACCESS_OK; -} - static void sdcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value) { @@ -5097,9 +5085,8 @@ static const ARMCPRegInfo v8_cp_reginfo[] = { .access = PL1_RW, .readfn = spsel_read, .writefn = spsel_write }, { .name = "FPEXC32_EL2", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 4, .crn = 5, .crm = 3, .opc2 = 0, - .type = ARM_CP_ALIAS, - .fieldoffset = offsetof(CPUARMState, vfp.xregs[ARM_VFP_FPEXC]), - .access = PL2_RW, .accessfn = fpexc32_access }, + .access = PL2_RW, .type = ARM_CP_ALIAS | ARM_CP_FPU, + .fieldoffset = offsetof(CPUARMState, vfp.xregs[ARM_VFP_FPEXC]) }, { .name = "DACR32_EL2", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 4, .crn = 3, .crm = 0, .opc2 = 0, .access = PL2_RW, .resetvalue = 0, diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c index 70b42b55fd..2b87e8808b 100644 --- a/target/arm/op_helper.c +++ b/target/arm/op_helper.c @@ -691,19 +691,6 @@ void HELPER(access_check_cp_reg)(CPUARMState *env, void *rip, uint32_t syndrome, target_el = 3; syndrome = syn_uncategorized(); break; - case CP_ACCESS_TRAP_FP_EL2: - target_el = 2; - /* Since we are an implementation that takes exceptions on a trapped - * conditional insn only if the insn has passed its condition code - * check, we take the IMPDEF choice to always report CV=1 COND=0xe - * (which is also the required value for AArch64 traps). - */ - syndrome = syn_fp_access_trap(1, 0xe, false); - break; - case CP_ACCESS_TRAP_FP_EL3: - target_el = 3; - syndrome = syn_fp_access_trap(1, 0xe, false); - break; default: g_assert_not_reached(); } -- 2.11.0