* [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions
@ 2013-07-19 16:21 Kwok Cheung Yeung
2013-07-23 14:56 ` Peter Maydell
2013-07-29 10:23 ` Maciej W. Rozycki
0 siblings, 2 replies; 4+ messages in thread
From: Kwok Cheung Yeung @ 2013-07-19 16:21 UTC (permalink / raw)
To: peter.maydell, qemu-devel; +Cc: Kwok Cheung Yeung, riku.voipio, aurelien
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>
---
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
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions
2013-07-19 16:21 [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions Kwok Cheung Yeung
@ 2013-07-23 14:56 ` Peter Maydell
2013-07-29 10:23 ` Maciej W. Rozycki
1 sibling, 0 replies; 4+ messages in thread
From: Peter Maydell @ 2013-07-23 14:56 UTC (permalink / raw)
To: Kwok Cheung Yeung; +Cc: riku.voipio, qemu-devel, aurelien
On 19 July 2013 17:21, Kwok Cheung Yeung <kcy@codesourcery.com> wrote:
> 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>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions
2013-07-19 16:21 [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions Kwok Cheung Yeung
2013-07-23 14:56 ` Peter Maydell
@ 2013-07-29 10:23 ` Maciej W. Rozycki
2013-08-14 12:03 ` Maciej W. Rozycki
1 sibling, 1 reply; 4+ messages in thread
From: Maciej W. Rozycki @ 2013-07-29 10:23 UTC (permalink / raw)
To: Kwok Cheung Yeung; +Cc: peter.maydell, riku.voipio, qemu-devel, aurelien
On Fri, 19 Jul 2013, Kwok Cheung Yeung wrote:
> 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>
> ---
> 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];
You need to tell 16-bit and 32-bit microMIPS BREAK instructions apart
somehow.
Maciej
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions
2013-07-29 10:23 ` Maciej W. Rozycki
@ 2013-08-14 12:03 ` Maciej W. Rozycki
0 siblings, 0 replies; 4+ messages in thread
From: Maciej W. Rozycki @ 2013-08-14 12:03 UTC (permalink / raw)
To: Kwok Cheung Yeung; +Cc: peter.maydell, riku.voipio, qemu-devel, aurelien
On Mon, 29 Jul 2013, Maciej W. Rozycki wrote:
> > 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>
> > ---
> > 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];
>
> You need to tell 16-bit and 32-bit microMIPS BREAK instructions apart
> somehow.
I can see the broken change was actually applied -- Kwok, did you have a
chance to have a look at making a fix?
Maciej
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-08-14 12:03 UTC | newest]
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2013-07-19 16:21 [Qemu-devel] [PATCH v3] linux-user: Handle compressed ISA encodings when processing MIPS exceptions Kwok Cheung Yeung
2013-07-23 14:56 ` Peter Maydell
2013-07-29 10:23 ` Maciej W. Rozycki
2013-08-14 12:03 ` Maciej W. Rozycki
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