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[Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when
From: |
Kwok Cheung Yeung |
Subject: |
[Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions |
Date: |
Fri, 19 Jul 2013 09:21:44 -0700 |
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 <address@hidden>
---
linux-user/main.c | 46 +++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 43 insertions(+), 3 deletions(-)
v2->v3: Handle microMIPS and MIPS16e instructions when processing EXCP_BREAK.
diff --git a/linux-user/main.c b/linux-user/main.c
index 7f15d3d..b137216 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2348,7 +2348,31 @@ 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;
}
@@ -2372,14 +2396,30 @@ 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) {
--
1.8.3.3
- [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions,
Kwok Cheung Yeung <=