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[Qemu-arm] [PATCH v5 3/5] target/arm: handle A-profile semihosting at tr
From: |
Alex Bennée |
Subject: |
[Qemu-arm] [PATCH v5 3/5] target/arm: handle A-profile semihosting at translate time |
Date: |
Wed, 11 Sep 2019 17:49:57 +0100 |
As for the other semihosting calls we can resolve this at translate
time.
Signed-off-by: Alex Bennée <address@hidden>
---
v2
- update for change to gen_exception_internal_insn API
v3
- update for decode tree, merge T32 & A32 commits
- dropped r-b due to changes
v4
- !IS_USER and !arm_dc_feature(s, ARM_FEATURE_M)
v5
- only if !IS_USER for softmmu, linux-user is still allowed
---
target/arm/translate.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/target/arm/translate.c b/target/arm/translate.c
index 6689acc911e..fac791c4b06 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -10219,14 +10219,25 @@ static bool trans_CBZ(DisasContext *s, arg_CBZ *a)
}
/*
- * Supervisor call
+ * Supervisor call - both T32 & A32 come here so we need to check
+ * which mode we are in when checking for semihosting.
*/
static bool trans_SVC(DisasContext *s, arg_SVC *a)
{
- gen_set_pc_im(s, s->base.pc_next);
- s->svc_imm = a->imm;
- s->base.is_jmp = DISAS_SWI;
+ const uint32_t semihost_imm = s->thumb ? 0xab : 0x123456;
+
+ if (!arm_dc_feature(s, ARM_FEATURE_M) && semihosting_enabled() &&
+#ifndef CONFIG_USER_ONLY
+ !IS_USER(s) &&
+#endif
+ (a->imm == semihost_imm)) {
+ gen_exception_internal_insn(s, s->base.pc_next, EXCP_SEMIHOST);
+ } else {
+ gen_set_pc_im(s, s->base.pc_next);
+ s->svc_imm = a->imm;
+ s->base.is_jmp = DISAS_SWI;
+ }
return true;
}
--
2.20.1
[Qemu-arm] [PATCH v5 3/5] target/arm: handle A-profile semihosting at translate time,
Alex Bennée <=
[Qemu-arm] [PATCH v5 4/5] target/arm: remove run time semihosting checks, Alex Bennée, 2019/09/11
[Qemu-arm] [PATCH v5 5/5] target/arm: remove run-time semihosting checks for linux-user, Alex Bennée, 2019/09/11