From: Eric Johnson <ericj@mips.com>
To: qemu-devel@nongnu.org, aurelien@aurel32.net
Subject: [Qemu-devel] [PATCH] Allow microMIPS SWP and SDP to have RD equal to BASE.
Date: Sat, 17 Sep 2011 17:28:16 -0700 [thread overview]
Message-ID: <20110918002816.GA10076@linux-ericj.mips.com> (raw)
The microMIPS SWP and SDP instructions do not modify GPRs. So their
behavior is well defined when RD equals BASE. The MIPS Architecture
Verification Programs (AVPs) check that they work as expected. This
is required for AVPs to pass.
Signed-off-by: Eric Johnson <ericj@mips.com>
---
target-mips/translate.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
The patch applies to a8467c7a0e8b024a18608ff7db31ca2f2297e641.
diff --git a/target-mips/translate.c b/target-mips/translate.c
index d5b1c76..82cf75b 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -10034,7 +10034,7 @@ static void gen_ldst_pair (DisasContext *ctx, uint32_t opc, int rd,
const char *opn = "ldst_pair";
TCGv t0, t1;
- if (ctx->hflags & MIPS_HFLAG_BMASK || rd == 31 || rd == base) {
+ if (ctx->hflags & MIPS_HFLAG_BMASK || rd == 31) {
generate_exception(ctx, EXCP_RI);
return;
}
@@ -10046,6 +10046,10 @@ static void gen_ldst_pair (DisasContext *ctx, uint32_t opc, int rd,
switch (opc) {
case LWP:
+ if (rd == base) {
+ generate_exception(ctx, EXCP_RI);
+ return;
+ }
save_cpu_state(ctx, 0);
op_ld_lw(t1, t0, ctx);
gen_store_gpr(t1, rd);
@@ -10067,6 +10071,10 @@ static void gen_ldst_pair (DisasContext *ctx, uint32_t opc, int rd,
break;
#ifdef TARGET_MIPS64
case LDP:
+ if (rd == base) {
+ generate_exception(ctx, EXCP_RI);
+ return;
+ }
save_cpu_state(ctx, 0);
op_ld_ld(t1, t0, ctx);
gen_store_gpr(t1, rd);
next reply other threads:[~2011-09-18 0:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-18 0:28 Eric Johnson [this message]
2012-08-27 11:45 ` [Qemu-devel] [PATCH] Allow microMIPS SWP and SDP to have RD equal to BASE Aurelien Jarno
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