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linux-user: Handle compressed ISA encodings when processing MIPS exceptions 

Decode trap instructions during the handling of an EXCP_BREAK or EXCP_TRAP
according to the current ISA mode.

Signed-off-by: Kwok Cheung Yeung <kcy@codesourcery.com>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Kwok Cheung Yeung 2013-07-19 09:21:44 -07:00 committed by Riku Voipio
parent d02532f08e
commit a033381758
1 changed files with 43 additions and 3 deletions
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46
linux-user/main.c
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@ -2310,7 +2310,31 @@ done_syscall:
abi_ulong trap_instr;
unsigned int code;
ret = get_user_ual(trap_instr, env->active_tc.PC);
if (env->hflags & MIPS_HFLAG_M16) {
if (env->insn_flags & ASE_MICROMIPS) {
/* microMIPS mode */
abi_ulong instr[2];
ret = get_user_u16(instr[0], env->active_tc.PC) ||
get_user_u16(instr[1], env->active_tc.PC + 2);
trap_instr = (instr[0] << 16) | instr[1];
} else {
/* MIPS16e mode */
ret = get_user_u16(trap_instr, env->active_tc.PC);
if (ret != 0) {
goto error;
}
code = (trap_instr >> 6) & 0x3f;
if (do_break(env, &info, code) != 0) {
goto error;
}
break;
}
} else {
ret = get_user_ual(trap_instr, env->active_tc.PC);
}
if (ret != 0) {
goto error;
}
@ -2334,14 +2358,30 @@ done_syscall:
abi_ulong trap_instr;
unsigned int code = 0;
ret = get_user_ual(trap_instr, env->active_tc.PC);
if (env->hflags & MIPS_HFLAG_M16) {
/* microMIPS mode */
abi_ulong instr[2];
ret = get_user_u16(instr[0], env->active_tc.PC) ||
get_user_u16(instr[1], env->active_tc.PC + 2);
trap_instr = (instr[0] << 16) | instr[1];
} else {
ret = get_user_ual(trap_instr, env->active_tc.PC);
}
if (ret != 0) {
goto error;
}
/* The immediate versions don't provide a code. */
if (!(trap_instr & 0xFC000000)) {
code = ((trap_instr >> 6) & ((1 << 10) - 1));
if (env->hflags & MIPS_HFLAG_M16) {
/* microMIPS mode */
code = ((trap_instr >> 12) & ((1 << 4) - 1));
} else {
code = ((trap_instr >> 6) & ((1 << 10) - 1));
}
}
if (do_break(env, &info, code) != 0) {