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target/arm: Add v8M stack limit checks on NS function calls

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Check the v8M stack limits when pushing the frame for a
non-secure function call via BLXNS.

In order to be able to generate the exception we need to
promote raise_exception() from being local to op_helper.c
so we can call it from helper.c.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181002163556.10279-8-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-10-08 14:55:04 +01:00
parent c32da7aa62
commit 597610eb39
3 changed files with 15 additions and 2 deletions
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4
target/arm/helper.c
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@ -6738,6 +6738,10 @@ void HELPER(v7m_blxns)(CPUARMState *env, uint32_t dest)
"BLXNS with misaligned SP is UNPREDICTABLE\n");
}
if (sp < v7m_sp_limit(env)) {
raise_exception(env, EXCP_STKOF, 0, 1);
}
saved_psr = env->v7m.exception;
if (env->v7m.control[M_REG_S] & R_V7M_CONTROL_SFPA_MASK) {
saved_psr |= XPSR_SFPA;