diff options
author | Richard Henderson <richard.henderson@linaro.org> | 2017-12-15 14:37:26 -0600 |
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committer | Richard Henderson <richard.henderson@linaro.org> | 2018-01-31 05:30:50 -0800 |
commit | 43e056522f3e653d0d7e412b4e4d54eb7bcae8b1 (patch) | |
tree | be33d01c791fca04dde93fdc25d0c30913319660 /target/hppa/translate.c | |
parent | c643603a85fc27e2a899ec99b44a61ab1f631e21 (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.c | 48 |
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, |