diff options
| -rw-r--r-- | target-arm/translate.c | 66 |
1 files changed, 61 insertions, 5 deletions
diff --git a/target-arm/translate.c b/target-arm/translate.c index cf3dc33774..7bceb05f48 100644 --- a/target-arm/translate.c +++ b/target-arm/translate.c @@ -7578,8 +7578,67 @@ static void gen_srs(DisasContext *s, uint32_t mode, uint32_t amode, bool writeback) { int32_t offset; - TCGv_i32 addr = tcg_temp_new_i32(); - TCGv_i32 tmp = tcg_const_i32(mode); + TCGv_i32 addr, tmp; + bool undef = false; + + /* SRS is: + * - trapped to EL3 if EL3 is AArch64 and we are at Secure EL1 + * - UNDEFINED in Hyp mode + * - UNPREDICTABLE in User or System mode + * - UNPREDICTABLE if the specified mode is: + * -- not implemented + * -- not a valid mode number + * -- a mode that's at a higher exception level + * -- Monitor, if we are Non-secure + * For the UNPREDICTABLE cases we choose to UNDEF, except that for + * "current mode is System" we will write a garbage SPSR. + * (This is because we don't have access to our current mode here + * and would have to do a runtime check to UNDEF for System.) + */ + if (s->current_el == 1 && !s->ns) { + gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized(), 3); + return; + } + + if (s->current_el == 0 || s->current_el == 2) { + undef = true; + } + + switch (mode) { + case ARM_CPU_MODE_USR: + case ARM_CPU_MODE_FIQ: + case ARM_CPU_MODE_IRQ: + case ARM_CPU_MODE_SVC: + case ARM_CPU_MODE_ABT: + case ARM_CPU_MODE_UND: + case ARM_CPU_MODE_SYS: + break; + case ARM_CPU_MODE_HYP: + if (s->current_el == 1 || !arm_dc_feature(s, ARM_FEATURE_EL2)) { + undef = true; + } + break; + case ARM_CPU_MODE_MON: + /* No need to check specifically for "are we non-secure" because + * we've already made EL0 UNDEF and handled the trap for S-EL1; + * so if this isn't EL3 then we must be non-secure. + */ + if (s->current_el != 3) { + undef = true; + } + break; + default: + undef = true; + } + + if (undef) { + gen_exception_insn(s, 4, EXCP_UDEF, syn_uncategorized(), + default_exception_el(s)); + return; + } + + addr = tcg_temp_new_i32(); + tmp = tcg_const_i32(mode); gen_helper_get_r13_banked(addr, cpu_env, tmp); tcg_temp_free_i32(tmp); switch (amode) { @@ -7739,9 +7798,6 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) } } else if ((insn & 0x0e5fffe0) == 0x084d0500) { /* srs */ - if (IS_USER(s)) { - goto illegal_op; - } ARCH(6); gen_srs(s, (insn & 0x1f), (insn >> 23) & 3, insn & (1 << 21)); return; |