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target/arm: Add v8M stack checks on ADD/SUB/MOV of SP

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Add code to insert calls to a helper function to do the stack
limit checking when we handle these forms of instruction
that write to SP:
 * ADD (SP plus immediate)
 * ADD (SP plus register)
 * SUB (SP minus immediate)
 * SUB (SP minus register)
 * MOV (register)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181002163556.10279-5-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-10-08 14:55:04 +01:00
parent 5529bf188d
commit 5520318939
4 changed files with 106 additions and 9 deletions
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19
target/arm/op_helper.c
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@ -238,6 +238,25 @@ void arm_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
#endif /* !defined(CONFIG_USER_ONLY) */
void HELPER(v8m_stackcheck)(CPUARMState *env, uint32_t newvalue)
{
/*
* Perform the v8M stack limit check for SP updates from translated code,
* raising an exception if the limit is breached.
*/
if (newvalue < v7m_sp_limit(env)) {
CPUState *cs = CPU(arm_env_get_cpu(env));
/*
* Stack limit exceptions are a rare case, so rather than syncing
* PC/condbits before the call, we use cpu_restore_state() to
* get them right before raising the exception.
*/
cpu_restore_state(cs, GETPC(), true);
raise_exception(env, EXCP_STKOF, 0, 1);
}
}
uint32_t HELPER(add_setq)(CPUARMState *env, uint32_t a, uint32_t b)
{
uint32_t res = a + b;