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target-arm: implement SCTLR.B, drop bswap_code

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bswap_code is a CPU property of sorts ("is the iside endianness the
opposite way round to TARGET_WORDS_BIGENDIAN?") but it is not the
actual CPU state involved here which is SCTLR.B (set for BE32
binaries, clear for BE8).

Replace bswap_code with SCTLR.B, and pass that to arm_ld*_code.
The next patches will make data fetches honor both SCTLR.B and
CPSR.E appropriately.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[PC changes:
 * rebased on master (Jan 2016)
 * s/TARGET_USER_ONLY/CONFIG_USER_ONLY
 * Use bswap_code() for disas_set_info() instead of raw sctlr_b
]
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Paolo Bonzini 2016-03-04 11:30:19 +00:00 • committed by Peter Maydell
parent 49017bd8b4
commit f9fd40ebe4
8 changed files with 67 additions and 32 deletions
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8
target-arm/helper.c
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@ -5848,7 +5848,7 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
case EXCP_BKPT:
if (semihosting_enabled()) {
int nr;
nr = arm_lduw_code(env, env->regs[15], env->bswap_code) & 0xff;
nr = arm_lduw_code(env, env->regs[15], arm_sctlr_b(env)) & 0xff;
if (nr == 0xab) {
env->regs[15] += 2;
qemu_log_mask(CPU_LOG_INT,
@ -6386,13 +6386,13 @@ static inline bool check_for_semihosting(CPUState *cs)
case EXCP_SWI:
/* Check for semihosting interrupt. */
if (env->thumb) {
imm = arm_lduw_code(env, env->regs[15] - 2, env->bswap_code)
imm = arm_lduw_code(env, env->regs[15] - 2, arm_sctlr_b(env))
& 0xff;
if (imm == 0xab) {
break;
}
} else {
imm = arm_ldl_code(env, env->regs[15] - 4, env->bswap_code)
imm = arm_ldl_code(env, env->regs[15] - 4, arm_sctlr_b(env))
& 0xffffff;
if (imm == 0x123456) {
break;
@ -6402,7 +6402,7 @@ static inline bool check_for_semihosting(CPUState *cs)
case EXCP_BKPT:
/* See if this is a semihosting syscall. */
if (env->thumb) {
imm = arm_lduw_code(env, env->regs[15], env->bswap_code)
imm = arm_lduw_code(env, env->regs[15], arm_sctlr_b(env))
& 0xff;
if (imm == 0xab) {
env->regs[15] += 2;