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target/arm: Introduce raise_exception_ra 

This path uses cpu_loop_exit_restore to unwind current processor state.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20190108223129.5570-5-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2019-01-21 10:23:11 +00:00 committed by Peter Maydell
parent 0816ef1bfc
commit 7469f6c696
2 changed files with 24 additions and 2 deletions
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7
target/arm/internals.h
View File

@ -103,6 +103,13 @@ FIELD(V7M_EXCRET, RES1, 7, 25) /* including the must-be-1 prefix */
void QEMU_NORETURN raise_exception(CPUARMState *env, uint32_t excp,
uint32_t syndrome, uint32_t target_el);
/*
* Similarly, but also use unwinding to restore cpu state.
*/
void QEMU_NORETURN raise_exception_ra(CPUARMState *env, uint32_t excp,
uint32_t syndrome, uint32_t target_el,
uintptr_t ra);
/*
* For AArch64, map a given EL to an index in the banked_spsr array.
* Note that this mapping and the AArch32 mapping defined in bank_number()

19
target/arm/op_helper.c
View File

@ -28,8 +28,8 @@
#define SIGNBIT (uint32_t)0x80000000
#define SIGNBIT64 ((uint64_t)1 << 63)
void raise_exception(CPUARMState *env, uint32_t excp,
uint32_t syndrome, uint32_t target_el)
static CPUState *do_raise_exception(CPUARMState *env, uint32_t excp,
uint32_t syndrome, uint32_t target_el)
{
CPUState *cs = CPU(arm_env_get_cpu(env));
@ -50,9 +50,24 @@ void raise_exception(CPUARMState *env, uint32_t excp,
cs->exception_index = excp;
env->exception.syndrome = syndrome;
env->exception.target_el = target_el;
return cs;
}
void raise_exception(CPUARMState *env, uint32_t excp,
uint32_t syndrome, uint32_t target_el)
{
CPUState *cs = do_raise_exception(env, excp, syndrome, target_el);
cpu_loop_exit(cs);
}
void raise_exception_ra(CPUARMState *env, uint32_t excp, uint32_t syndrome,
uint32_t target_el, uintptr_t ra)
{
CPUState *cs = do_raise_exception(env, excp, syndrome, target_el);
cpu_loop_exit_restore(cs, ra);
}
static int exception_target_el(CPUARMState *env)
{
int target_el = MAX(1, arm_current_el(env));