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target/arm: Implement M-profile trapping on division by zero

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Unlike A-profile, for M-profile the UDIV and SDIV insns can be
configured to raise an exception on division by zero, using the CCR
DIV_0_TRP bit.

Implement support for setting this bit by making the helper functions
raise the appropriate exception.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210730151636.17254-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-07-30 16:16:36 +01:00
parent fc7a5038a6
commit e534629296
5 changed files with 26 additions and 6 deletions
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target/arm/cpu.h
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@ -54,6 +54,7 @@
#define EXCP_LAZYFP 20 /* v7M fault during lazy FP stacking */
#define EXCP_LSERR 21 /* v8M LSERR SecureFault */
#define EXCP_UNALIGNED 22 /* v7M UNALIGNED UsageFault */
#define EXCP_DIVBYZERO 23 /* v7M DIVBYZERO UsageFault */
/* NB: add new EXCP_ defines to the array in arm_log_exception() too */
#define ARMV7M_EXCP_RESET 1