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authorRichard Henderson <richard.henderson@linaro.org>2017-12-15 14:37:26 -0600
committerRichard Henderson <richard.henderson@linaro.org>2018-01-31 05:30:50 -0800
commit43e056522f3e653d0d7e412b4e4d54eb7bcae8b1 (patch)
treebe33d01c791fca04dde93fdc25d0c30913319660 /target/hppa/translate.c
parentc643603a85fc27e2a899ec99b44a61ab1f631e21 (diff)
target/hppa: Implement B,GATE insn
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/hppa/translate.c')
-rw-r--r--target/hppa/translate.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index 0f0d5333f3..b6b7262e53 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -3782,6 +3782,53 @@ static DisasJumpType trans_bl(DisasContext *ctx, uint32_t insn,
return do_dbranch(ctx, iaoq_dest(ctx, disp), link, n);
}
+static DisasJumpType trans_b_gate(DisasContext *ctx, uint32_t insn,
+ const DisasInsn *di)
+{
+ unsigned n = extract32(insn, 1, 1);
+ unsigned link = extract32(insn, 21, 5);
+ target_sreg disp = assemble_17(insn);
+ target_ureg dest = iaoq_dest(ctx, disp);
+
+ /* Make sure the caller hasn't done something weird with the queue.
+ * ??? This is not quite the same as the PSW[B] bit, which would be
+ * expensive to track. Real hardware will trap for
+ * b gateway
+ * b gateway+4 (in delay slot of first branch)
+ * However, checking for a non-sequential instruction queue *will*
+ * diagnose the security hole
+ * b gateway
+ * b evil
+ * in which instructions at evil would run with increased privs.
+ */
+ if (ctx->iaoq_b == -1 || ctx->iaoq_b != ctx->iaoq_f + 4) {
+ return gen_illegal(ctx);
+ }
+
+#ifndef CONFIG_USER_ONLY
+ if (ctx->tb_flags & PSW_C) {
+ CPUHPPAState *env = ctx->cs->env_ptr;
+ int type = hppa_artype_for_page(env, ctx->base.pc_next);
+ /* If we could not find a TLB entry, then we need to generate an
+ ITLB miss exception so the kernel will provide it.
+ The resulting TLB fill operation will invalidate this TB and
+ we will re-translate, at which point we *will* be able to find
+ the TLB entry and determine if this is in fact a gateway page. */
+ if (type < 0) {
+ return gen_excp(ctx, EXCP_ITLB_MISS);
+ }
+ /* No change for non-gateway pages or for priv decrease. */
+ if (type >= 4 && type - 4 < ctx->privilege) {
+ dest = deposit32(dest, 0, 2, type - 4);
+ }
+ } else {
+ dest &= -4; /* priv = 0 */
+ }
+#endif
+
+ return do_dbranch(ctx, dest, link, n);
+}
+
static DisasJumpType trans_bl_long(DisasContext *ctx, uint32_t insn,
const DisasInsn *di)
{
@@ -3860,6 +3907,7 @@ static const DisasInsn table_branch[] = {
{ 0xe8004000u, 0xfc00fffdu, trans_blr },
{ 0xe800c000u, 0xfc00fffdu, trans_bv },
{ 0xe800d000u, 0xfc00dffcu, trans_bve },
+ { 0xe8002000u, 0xfc00e000u, trans_b_gate },
};
static DisasJumpType trans_fop_wew_0c(DisasContext *ctx, uint32_t insn,