[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2] linux-user: Handle microMIPS encoding when proce
From: |
Kwok Cheung Yeung |
Subject: |
[Qemu-devel] [PATCH v2] linux-user: Handle microMIPS encoding when processing trap exceptions |
Date: |
Fri, 19 Jul 2013 07:47:13 -0700 |
Decode trap instructions during the handling of an EXCP_TRAP according to
the current ISA mode.
Signed-off-by: Kwok Cheung Yeung <address@hidden>
---
linux-user/main.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
v2: Read microMIPS instructions sequentially as 16-bit values to avoid
endianess issues. Add braces to if statement to conform to formatting
standards.
diff --git a/linux-user/main.c b/linux-user/main.c
index 7f15d3d..7faa945 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -2372,14 +2372,30 @@ 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 v2] linux-user: Handle microMIPS encoding when processing trap exceptions,
Kwok Cheung Yeung <=