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target-mips: fix semihosting for microMIPS R6

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In semihosting mode the SDBBP 1 instructions should trigger UHI syscall,
but in QEMU this does not happen for recently added microMIPS R6.
Consequently bare metal microMIPS R6 programs supporting UHI will not run.

Backports commit 060ebfef1a09b58fb219b3769b72efb407515bf1 from qemu
This commit is contained in:
Leon Alrae 2018-02-14 19:17:35 -05:00 committed by Lioncash
parent 45927edecf
commit f0bf3c2e3b
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 9 additions and 4 deletions
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13
qemu/target-mips/translate.c
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@ -13371,10 +13371,15 @@ static void gen_pool16c_r6_insn(DisasContext *ctx)
break;
case R6_SDBBP16:
/* SDBBP16 */
if (ctx->hflags & MIPS_HFLAG_SBRI) {
generate_exception(ctx, EXCP_RI);
} else {
generate_exception(ctx, EXCP_DBp);
// UNICORN: Commented out
/*if (is_uhi(extract32(ctx->opcode, 6, 4))) {
gen_helper_do_semihosting(cpu_env);
} else*/ {
if (ctx->hflags & MIPS_HFLAG_SBRI) {
generate_exception(ctx, EXCP_RI);
} else {
generate_exception(ctx, EXCP_DBp);
}
}
break;
}