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target-arm: ignore ELR_ELx[1] for exception return to 32-bit ARM mode 

The architecture requires that for an exception return to AArch32 the
low bits of ELR_ELx are ignored when the PC is set from them:
 * if returning to Thumb mode, ignore ELR_ELx[0]
 * if returning to ARM mode, ignore ELR_ELx[1:0]

We were only squashing bit 0; also squash bit 1 if the SPSR T bit
indicates this is a return to ARM code.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
Peter Maydell 2016-01-21 14:15:09 +00:00
parent e393f339af
commit c1e0371442
1 changed files with 5 additions and 1 deletions
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6
target-arm/op_helper.c
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@ -738,7 +738,11 @@ void HELPER(exception_return)(CPUARMState *env)
}
aarch64_sync_64_to_32(env);
env->regs[15] = env->elr_el[cur_el] & ~0x1;
if (spsr & CPSR_T) {
env->regs[15] = env->elr_el[cur_el] & ~0x1;
} else {
env->regs[15] = env->elr_el[cur_el] & ~0x3;
}
} else {
env->aarch64 = 1;
pstate_write(env, spsr);