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linux-user/loongarch64: Use traps to track LSX/LASX usage

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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231101030816.2353416-2-gaosong@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
This commit is contained in:
Richard Henderson 2023-11-01 11:08:11 +08:00 • committed by Song Gao
parent 1d832c19db
commit 91ffd93be6
2 changed files with 13 additions and 11 deletions
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13
linux-user/loongarch64/cpu_loop.c
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@ -72,6 +72,19 @@ void cpu_loop(CPULoongArchState *env)
case EXCCODE_BCE:
force_sig_fault(TARGET_SIGSYS, TARGET_SI_KERNEL, env->pc);
break;
/*
* Begin with LSX and LASX disabled, then enable on the first trap.
* In this way we can tell if the unit is in use. This is used to
* choose the layout of any signal frame.
*/
case EXCCODE_SXD:
env->CSR_EUEN |= R_CSR_EUEN_SXE_MASK;
break;
case EXCCODE_ASXD:
env->CSR_EUEN |= R_CSR_EUEN_ASXE_MASK;
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;