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target/arm/helper: Perform comparison pass with qemu

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Ensure all code and formatting is up to date
This commit is contained in:
Lioncash 2018-03-15 22:49:08 -04:00
parent 74a1c4e2e1
commit 28abd51f84
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 5 deletions
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17
qemu/target/arm/helper.c
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@ -6169,12 +6169,19 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
bool exc_secure = false;
bool return_to_secure;
/* We can only get here from an EXCP_EXCEPTION_EXIT, and
* gen_bx_excret() enforces the architectural rule
* that jumps to magic addresses don't have magic behaviour unless
* we're in Handler mode (compare pseudocode BXWritePC()).
/* If we're not in Handler mode then jumps to magic exception-exit
* addresses don't have magic behaviour. However for the v8M
* security extensions the magic secure-function-return has to
* work in thread mode too, so to avoid doing an extra check in
* the generated code we allow exception-exit magic to also cause the
* internal exception and bring us here in thread mode. Correct code
* will never try to do this (the following insn fetch will always
* fault) so we the overhead of having taken an unnecessary exception
* doesn't matter.
*/
assert(arm_v7m_is_handler_mode(env));
if (!arm_v7m_is_handler_mode(env)) {
return;
}
/* In the spec pseudocode ExceptionReturn() is called directly
* from BXWritePC() and gets the full target PC value including