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Re: [Qemu-devel] [PATCH] PPC: Add wrapper for target long DCR operations

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH] PPC: Add wrapper for target long DCR operations
Date: Sat, 6 Feb 2010 18:16:22 +0100

Am 06.02.2010 um 17:15 schrieb Aurelien Jarno <address@hidden>:

On Thu, Jan 14, 2010 at 06:04:25PM +0100, Alexander Graf wrote:

On 14.01.2010, at 18:02, Aurelien Jarno wrote:

On Thu, Jan 14, 2010 at 04:19:31PM +0100, Alexander Graf wrote:

On 14.01.2010, at 16:13, Aurelien Jarno wrote:

On Fri, Jan 01, 2010 at 04:41:06PM +0100, Alexander Graf wrote:
The recent transition to always have the DCR helper functions take 32 bit
values broke the PPC64 target, as tlong became 64 bits there.

This patch moves all translate.c callers to a _tl function that simply calls the uint32_t functions. That way we don't need to mess with TCG
trying to pass registers as uint32_t variables to functions.

Fixes PPC64 build with --enable-debug-tcg

Signed-off-by: Alexander Graf <address@hidden>
Reported-by: Stefan Weil <address@hidden>
target-ppc/cpu.h       |    2 ++
target-ppc/helper.h    |    4 ++--
target-ppc/op_helper.c |   10 ++++++++++
target-ppc/translate.c |   12 ++++++------
4 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index d15bba1..60a8b68 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -733,6 +733,8 @@ void ppc_store_slb (CPUPPCState *env, target_ulong rb, target_ulong rs); void ppc_store_sr (CPUPPCState *env, int srnum, target_ulong value);
#endif /* !defined(CONFIG_USER_ONLY) */
void ppc_store_msr (CPUPPCState *env, target_ulong value);
+void helper_store_dcr (uint32_t dcrn, uint32_t val);
+uint32_t helper_load_dcr (uint32_t dcrn);

void ppc_cpu_list (FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...));

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 40d4ced..86f0af7 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -359,8 +359,8 @@ DEF_HELPER_2(divo, tl, tl, tl)
DEF_HELPER_2(divs, tl, tl, tl)
DEF_HELPER_2(divso, tl, tl, tl)

-DEF_HELPER_1(load_dcr, i32, i32);
-DEF_HELPER_2(store_dcr, void, i32, i32)
+DEF_HELPER_1(load_dcr_tl, tl, tl);
+DEF_HELPER_2(store_dcr_tl, void, tl, tl)

DEF_HELPER_1(load_dump_spr, void, i32)
DEF_HELPER_1(store_dump_spr, void, i32)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index cea27f2..6c375d3 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -1844,6 +1844,11 @@ uint32_t helper_load_dcr (uint32_t dcrn)
  return val;

+target_ulong helper_load_dcr_tl (target_ulong dcrn)
+    return (uint32_t)helper_load_dcr((uint32_t)dcrn);
void helper_store_dcr (uint32_t dcrn, uint32_t val)
  if (unlikely(env->dcr_env == NULL)) {
@@ -1857,6 +1862,11 @@ void helper_store_dcr (uint32_t dcrn, uint32_t val)

+void helper_store_dcr_tl (target_ulong dcrn, target_ulong val)
+    helper_store_dcr((uint32_t)dcrn, (uint32_t)val);

I do wonder why we need to keep the old helper_load_dcr() and
helper_store_dcr() instead of modifying them directly. They doesn't seems
to be used elsewhere.

Last time I checked they were used in hw/*ppc*.c. Maybe mangled through funny preprocessor or function callback logic. But maybe I'm wrong :).

I am not able to find them. I have tried to remove helper_load_dcr () and helper_store_dcr() from target-ppc/cpu.h and the code still compiles.

Hm, right. The only references are to ppc_dcr_read and ppc_dcr_write. I guess the other helpers are superfluous then.

I have applied a patch to fix the problem.

Thanks a lot! Sorry I didn't get to it :(.


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