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 <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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

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,

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();
     }