diff options
Diffstat (limited to 'target-arm/cpu.h')
| -rw-r--r-- | target-arm/cpu.h | 98 |
1 files changed, 90 insertions, 8 deletions
diff --git a/target-arm/cpu.h b/target-arm/cpu.h index 744f052a67..066ff678dc 100644 --- a/target-arm/cpu.h +++ b/target-arm/cpu.h @@ -478,9 +478,6 @@ typedef struct CPUARMState { uint32_t cregs[16]; } iwmmxt; - /* For mixed endian mode. */ - bool bswap_code; - #if defined(CONFIG_USER_ONLY) /* For usermode syscall translation. */ int eabi; @@ -1898,6 +1895,53 @@ static inline bool arm_singlestep_active(CPUARMState *env) && arm_generate_debug_exceptions(env); } +static inline bool arm_sctlr_b(CPUARMState *env) +{ + return + /* We need not implement SCTLR.ITD in user-mode emulation, so + * let linux-user ignore the fact that it conflicts with SCTLR_B. + * This lets people run BE32 binaries with "-cpu any". + */ +#ifndef CONFIG_USER_ONLY + !arm_feature(env, ARM_FEATURE_V7) && +#endif + (env->cp15.sctlr_el[1] & SCTLR_B) != 0; +} + +/* Return true if the processor is in big-endian mode. */ +static inline bool arm_cpu_data_is_big_endian(CPUARMState *env) +{ + int cur_el; + + /* In 32bit endianness is determined by looking at CPSR's E bit */ + if (!is_a64(env)) { + return +#ifdef CONFIG_USER_ONLY + /* In system mode, BE32 is modelled in line with the + * architecture (as word-invariant big-endianness), where loads + * and stores are done little endian but from addresses which + * are adjusted by XORing with the appropriate constant. So the + * endianness to use for the raw data access is not affected by + * SCTLR.B. + * In user mode, however, we model BE32 as byte-invariant + * big-endianness (because user-only code cannot tell the + * difference), and so we need to use a data access endianness + * that depends on SCTLR.B. + */ + arm_sctlr_b(env) || +#endif + ((env->uncached_cpsr & CPSR_E) ? 1 : 0); + } + + cur_el = arm_current_el(env); + + if (cur_el == 0) { + return (env->cp15.sctlr_el[1] & SCTLR_E0E) != 0; + } + + return (env->cp15.sctlr_el[cur_el] & SCTLR_EE) != 0; +} + #include "exec/cpu-all.h" /* Bit usage in the TB flags field: bit 31 indicates whether we are @@ -1928,8 +1972,8 @@ static inline bool arm_singlestep_active(CPUARMState *env) #define ARM_TBFLAG_VFPEN_MASK (1 << ARM_TBFLAG_VFPEN_SHIFT) #define ARM_TBFLAG_CONDEXEC_SHIFT 8 #define ARM_TBFLAG_CONDEXEC_MASK (0xff << ARM_TBFLAG_CONDEXEC_SHIFT) -#define ARM_TBFLAG_BSWAP_CODE_SHIFT 16 -#define ARM_TBFLAG_BSWAP_CODE_MASK (1 << ARM_TBFLAG_BSWAP_CODE_SHIFT) +#define ARM_TBFLAG_SCTLR_B_SHIFT 16 +#define ARM_TBFLAG_SCTLR_B_MASK (1 << ARM_TBFLAG_SCTLR_B_SHIFT) /* We store the bottom two bits of the CPAR as TB flags and handle * checks on the other bits at runtime */ @@ -1941,6 +1985,8 @@ static inline bool arm_singlestep_active(CPUARMState *env) */ #define ARM_TBFLAG_NS_SHIFT 19 #define ARM_TBFLAG_NS_MASK (1 << ARM_TBFLAG_NS_SHIFT) +#define ARM_TBFLAG_BE_DATA_SHIFT 20 +#define ARM_TBFLAG_BE_DATA_MASK (1 << ARM_TBFLAG_BE_DATA_SHIFT) /* Bit usage when in AArch64 state: currently we have no A64 specific bits */ @@ -1965,12 +2011,34 @@ static inline bool arm_singlestep_active(CPUARMState *env) (((F) & ARM_TBFLAG_VFPEN_MASK) >> ARM_TBFLAG_VFPEN_SHIFT) #define ARM_TBFLAG_CONDEXEC(F) \ (((F) & ARM_TBFLAG_CONDEXEC_MASK) >> ARM_TBFLAG_CONDEXEC_SHIFT) -#define ARM_TBFLAG_BSWAP_CODE(F) \ - (((F) & ARM_TBFLAG_BSWAP_CODE_MASK) >> ARM_TBFLAG_BSWAP_CODE_SHIFT) +#define ARM_TBFLAG_SCTLR_B(F) \ + (((F) & ARM_TBFLAG_SCTLR_B_MASK) >> ARM_TBFLAG_SCTLR_B_SHIFT) #define ARM_TBFLAG_XSCALE_CPAR(F) \ (((F) & ARM_TBFLAG_XSCALE_CPAR_MASK) >> ARM_TBFLAG_XSCALE_CPAR_SHIFT) #define ARM_TBFLAG_NS(F) \ (((F) & ARM_TBFLAG_NS_MASK) >> ARM_TBFLAG_NS_SHIFT) +#define ARM_TBFLAG_BE_DATA(F) \ + (((F) & ARM_TBFLAG_BE_DATA_MASK) >> ARM_TBFLAG_BE_DATA_SHIFT) + +static inline bool bswap_code(bool sctlr_b) +{ +#ifdef CONFIG_USER_ONLY + /* BE8 (SCTLR.B = 0, TARGET_WORDS_BIGENDIAN = 1) is mixed endian. + * The invalid combination SCTLR.B=1/CPSR.E=1/TARGET_WORDS_BIGENDIAN=0 + * would also end up as a mixed-endian mode with BE code, LE data. + */ + return +#ifdef TARGET_WORDS_BIGENDIAN + 1 ^ +#endif + sctlr_b; +#else + /* All code access in ARM is little endian, and there are no loaders + * doing swaps that need to be reversed + */ + return 0; +#endif +} /* Return the exception level to which FP-disabled exceptions should * be taken, or 0 if FP is enabled. @@ -2037,6 +2105,17 @@ static inline int fp_exception_el(CPUARMState *env) return 0; } +#ifdef CONFIG_USER_ONLY +static inline bool arm_cpu_bswap_data(CPUARMState *env) +{ + return +#ifdef TARGET_WORDS_BIGENDIAN + 1 ^ +#endif + arm_cpu_data_is_big_endian(env); +} +#endif + static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc, target_ulong *cs_base, int *flags) { @@ -2049,7 +2128,7 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc, | (env->vfp.vec_len << ARM_TBFLAG_VECLEN_SHIFT) | (env->vfp.vec_stride << ARM_TBFLAG_VECSTRIDE_SHIFT) | (env->condexec_bits << ARM_TBFLAG_CONDEXEC_SHIFT) - | (env->bswap_code << ARM_TBFLAG_BSWAP_CODE_SHIFT); + | (arm_sctlr_b(env) << ARM_TBFLAG_SCTLR_B_SHIFT); if (!(access_secure_reg(env))) { *flags |= ARM_TBFLAG_NS_MASK; } @@ -2081,6 +2160,9 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc, } } } + if (arm_cpu_data_is_big_endian(env)) { + *flags |= ARM_TBFLAG_BE_DATA_MASK; + } *flags |= fp_exception_el(env) << ARM_TBFLAG_FPEXC_EL_SHIFT; *cs_base = 0; |