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microblaze: Improve brk emulation.

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brk insns while in user mode raise priv insn exceptions.
This commit makes gdbserver work on linux guests.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
This commit is contained in:
Edgar E. Iglesias 2010-02-20 14:04:01 +01:00 committed by Edgar E. Iglesias
parent e1aa325409
commit ff21f70afd
1 changed files with 14 additions and 5 deletions
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19
target-microblaze/translate.c
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@ -993,6 +993,7 @@ static void dec_bcc(DisasContext *dc)
static void dec_br(DisasContext *dc) static void dec_br(DisasContext *dc)
{ {
unsigned int dslot, link, abs; unsigned int dslot, link, abs;
int mem_index = cpu_mmu_index(dc->env);
dslot = dc->ir & (1 << 20); dslot = dc->ir & (1 << 20);
abs = dc->ir & (1 << 19); abs = dc->ir & (1 << 19);
@ -1016,11 +1017,19 @@ static void dec_br(DisasContext *dc)
if (abs) { if (abs) {
tcg_gen_movi_tl(env_btaken, 1); tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_mov_tl(env_btarget, *(dec_alu_op_b(dc))); tcg_gen_mov_tl(env_btarget, *(dec_alu_op_b(dc)));
if (link && !(dc->tb_flags & IMM_FLAG) if (link && !dslot) {
&& (dc->imm == 8 || dc->imm == 0x18)) if (!(dc->tb_flags & IMM_FLAG) && (dc->imm == 8 || dc->imm == 0x18))
t_gen_raise_exception(dc, EXCP_BREAK); t_gen_raise_exception(dc, EXCP_BREAK);
if (dc->imm == 0) if (dc->imm == 0) {
t_gen_raise_exception(dc, EXCP_DEBUG); if ((dc->tb_flags & MSR_EE_FLAG) && mem_index == MMU_USER_IDX) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_PRIVINSN);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
}
t_gen_raise_exception(dc, EXCP_DEBUG);
}
}
} else { } else {
if (!dc->type_b || (dc->tb_flags & IMM_FLAG)) { if (!dc->type_b || (dc->tb_flags & IMM_FLAG)) {
tcg_gen_movi_tl(env_btaken, 1); tcg_gen_movi_tl(env_btaken, 1);