[PATCH] m32r: Fix pt_regs for !COFNIG_ISA_DSP_LEVEL2 target

This modification is required to fix debugging function for m32r targets
with !CONFIG_ISA_DSP_LEVEL2, by unifying 'struct pt_regs' and 'struct
sigcontext' size for all M32R ISA.

Some m32r processor core with !CONFIG_ISA_DSP_LEVEL2 configuration has only
single accumulator a0 (ex.  VDEC2 core, M32102 core, etc.), the others with
CONFIG_ISA_DSP_LEVEL2 has two accumulators, a0 and a1.

This means there are two variations of thread context.  So far, we reduced
and changed stackframe size at a syscall for their context size.  However,
this causes a problem that a GDB for processors with CONFIG_ISA_DSP_LEVEL2
cannot be used for processors with !CONFIG_ISA_DSP_LEVEL2.

From the viewpoint of GDB support, we should reduce such variation of
stackframe size for simplicity.

In this patch, dummy members are added to 'struct pt_regs' and 'struct
sigcontext' to adjust their size for !CONFIG_ISA_DSP_LEVEL2.

This modification is also a one step for a GDB update in future.
Currently, on the m32r, GDB can access process's context by using ptrace
functions in a simple way of register by register access.  By unifying
stackframe size, we have a possibility to make use of ptrace functions of
not only a single register access but also block register access,
PTRACE_{GETREGS,PUTREGS}.

However, for this purpose, we might have to modify stackframe structure
some more; for example, PSW (processor status word) register should be
pre-processed before pushing to stack at a syscall, and so on.  In this
case, we must update carefully both kernel and GDB at a time...

Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Kei Sakamoto <ksakamot@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 17 insertions, 15 deletions

diff --git a/include/asm-m32r/assembler.h b/include/asm-m32r/assembler.h
index b7f4d8aaeb46..1a1aa17edd33 100644
--- a/include/asm-m32r/assembler.h
+++ b/include/asm-m32r/assembler.h
@@ -109,6 +109,9 @@
         push    r13
         mvfachi r13
         push    r13
+        ldi     r13, #0
+        push    r13             ; dummy push acc1h
+        push    r13             ; dummy push acc1l
 #else
 #error unknown isa configuration
 #endif
@@ -156,6 +159,8 @@
         pop     r13
         mvtaclo r13, a1
 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
+        pop     r13             ; dummy pop acc1h
+        pop     r13             ; dummy pop acc1l
         pop     r13
         mvtachi r13
         pop     r13
diff --git a/include/asm-m32r/ptrace.h b/include/asm-m32r/ptrace.h
index 0d058b2d844e..53c792452dfc 100644
--- a/include/asm-m32r/ptrace.h
+++ b/include/asm-m32r/ptrace.h
@@ -43,6 +43,14 @@
 #define PT_ACC1L        18
 #define PT_ACCH         PT_ACC0H
 #define PT_ACCL         PT_ACC0L
+#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
+#define PT_ACCH         15
+#define PT_ACCL         16
+#define PT_DUMMY_ACC1H  17
+#define PT_DUMMY_ACC1L  18
+#else
+#error unknown isa conifiguration
+#endif
 #define PT_PSW          19
 #define PT_BPC          20
 #define PT_BBPSW        21
@@ -52,21 +60,6 @@
 #define PT_LR           25
 #define PT_SPI          26
 #define PT_ORIGR0       27
-#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
-#define PT_ACCH         15
-#define PT_ACCL         16
-#define PT_PSW          17
-#define PT_BPC          18
-#define PT_BBPSW        19
-#define PT_BBPC         20
-#define PT_SPU          21
-#define PT_FP           22
-#define PT_LR           23
-#define PT_SPI          24
-#define PT_ORIGR0       25
-#else
-#error unknown isa conifiguration
-#endif
 
 /* virtual pt_reg entry for gdb */
 #define PT_PC           30
@@ -121,6 +114,8 @@ struct pt_regs {
 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
         unsigned long acch;
         unsigned long accl;
+        unsigned long dummy_acc1h;
+        unsigned long dummy_acc1l;
 #else
 #error unknown isa configuration
 #endif
diff --git a/include/asm-m32r/sigcontext.h b/include/asm-m32r/sigcontext.h
index c233e2def2a3..942b8a30937d 100644
--- a/include/asm-m32r/sigcontext.h
+++ b/include/asm-m32r/sigcontext.h
@@ -32,6 +32,8 @@ struct sigcontext {
 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
         unsigned long sc_acch;
         unsigned long sc_accl;
+        unsigned long sc_dummy_acc1h;
+        unsigned long sc_dummy_acc1l;
 #else
 #error unknown isa configuration
 #endif