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target-arm: introduce tbflag for endianness

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Introduce a tbflags for endianness, set based upon the CPUs current
endianness. This in turn propagates through to the disas endianness
flag.

Backports commit 91cca2cda9823b1e7a049cb308a05104b5076cba from qemu
This commit is contained in:
Peter Crosthwaite 2018-02-21 02:34:21 -05:00 committed by Lioncash
parent 50a3c7f2ee
commit 902170741a
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
3 changed files with 43 additions and 36 deletions
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75
qemu/target-arm/cpu.h
View file

@ -1961,6 +1961,8 @@ 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 */
@ -1991,6 +1993,8 @@ static inline bool arm_singlestep_active(CPUARMState *env)
(((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)
{
@ -2091,6 +2095,40 @@ static inline bool arm_sctlr_b(CPUARMState *env)
(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;
}
static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
target_ulong *cs_base, int *flags)
{
@ -2135,6 +2173,9 @@ 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;
@ -2167,40 +2208,6 @@ static inline uint64_t *aa64_vfp_qreg(CPUARMState *env, unsigned regno)
return &env->vfp.regs[2 * regno];
}
/* 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/exec-all.h"
enum {

2
qemu/target-arm/translate-a64.c
View file

@ -11261,7 +11261,7 @@ void gen_intermediate_code_a64(ARMCPU *cpu, TranslationBlock *tb)
!arm_el_is_aa64(env, 3);
dc->thumb = 0;
dc->sctlr_b = 0;
dc->be_data = MO_TE;
dc->be_data = ARM_TBFLAG_BE_DATA(tb->flags) ? MO_BE : MO_LE;
dc->condexec_mask = 0;
dc->condexec_cond = 0;
dc->mmu_idx = ARM_TBFLAG_MMUIDX(tb->flags);

2
qemu/target-arm/translate.c
View file

@ -11490,7 +11490,7 @@ void gen_intermediate_code(CPUARMState *env, TranslationBlock *tb)
!arm_el_is_aa64(env, 3);
dc->thumb = ARM_TBFLAG_THUMB(tb->flags); // qq
dc->sctlr_b = ARM_TBFLAG_SCTLR_B(tb->flags);
dc->be_data = MO_TE;
dc->be_data = ARM_TBFLAG_BE_DATA(tb->flags) ? MO_BE : MO_LE;
dc->condexec_mask = (ARM_TBFLAG_CONDEXEC(tb->flags) & 0xf) << 1;
dc->condexec_cond = ARM_TBFLAG_CONDEXEC(tb->flags) >> 4;
dc->mmu_idx = ARM_TBFLAG_MMUIDX(tb->flags);