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arch: riscv: apply CONFIG_RISCV_MCAUSE_EXCEPTION_MASK to FPU code

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Some implementations use bits outside of the mcause mask for other
purpose.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2024-05-09 11:10:51 -04:00 • committed by Henrik Brix Andersen
commit 530b593275
1 changed files with 2 additions and 0 deletions
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2
arch/riscv/core/isr.S
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@ -203,6 +203,8 @@ SECTION_FUNC(exception.entry, _isr_wrapper)
bnez t1, no_fp
/* determine if this is an Illegal Instruction exception */
csrr t2, mcause
li t1, CONFIG_RISCV_MCAUSE_EXCEPTION_MASK
and t2, t2, t1
li t1, 2 /* 2 = illegal instruction */
bne t1, t2, no_fp
/* determine if we trapped on an FP instruction. */