[PATCH] Add unwind information for SPE registers of E500 core

[PATCH] Add unwind information for SPE registers of E500 core

[Liming Wang]

SPE registers use the high part bit0~bit31 of E500 GPR0~GPR31.
The unwind information in "eh_frame" section is used during exception
handling and describes register information in the signal frame. But
current unwind information doesn't cover SPE registers, which have
been saved in the signal frame. This patch adds this unwind information
to "eh_frame" section.

SPE registers use register number 1200+N to identify register 'N', but
they start from 113 in unwind column, which is computed from gcc
source code, macro DWARF_REG_TO_UNWIND_COLUMN:

	#define FIRST_PSEUDO_REGISTER 114
	#define DWARF_REG_TO_UNWIND_COLUMN(r) \
  	  ((r) > 1200 ? ((r) - 1200 + FIRST_PSEUDO_REGISTER - 1) : (r))

Signed-off-by: Liming Wang <liming.wang@windriver.com>
---
 arch/powerpc/kernel/vdso32/sigtramp.S |   34 +++++++++++++++++++++++++++++++++
 1 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/vdso32/sigtramp.S b/arch/powerpc/kernel/vdso32/sigtramp.S
index 68d49dd..789a343 100644
--- a/arch/powerpc/kernel/vdso32/sigtramp.S
+++ b/arch/powerpc/kernel/vdso32/sigtramp.S
@@ -251,6 +251,40 @@ V_FUNCTION_END(__kernel_sigtramp_rt32)
   vsave_msr1 (31);							\
   vsave_msr2 (33, 32*16+12);						\
   vsave      (32, 32*16)
+#elif defined(CONFIG_SPE)
+#define EH_FRAME_VMX \
+  rsave (113, VREGS);							\
+  rsave (114, VREGS + 1*4);						\
+  rsave (115, VREGS + 2*4);						\
+  rsave (116, VREGS + 3*4);						\
+  rsave (117, VREGS + 4*4);						\
+  rsave (118, VREGS + 5*4);						\
+  rsave (119, VREGS + 6*4);						\
+  rsave (120, VREGS + 7*4);						\
+  rsave (121, VREGS + 8*4);						\
+  rsave (122, VREGS + 9*4);						\
+  rsave (123, VREGS + 10*4);						\
+  rsave (124, VREGS + 11*4);						\
+  rsave (125, VREGS + 12*4);						\
+  rsave (126, VREGS + 13*4);						\
+  rsave (127, VREGS + 14*4);						\
+  rsave (128, VREGS + 15*4);						\
+  rsave (129, VREGS + 16*4);						\
+  rsave (130, VREGS + 17*4);						\
+  rsave (131, VREGS + 18*4);						\
+  rsave (132, VREGS + 19*4);						\
+  rsave (133, VREGS + 20*4);						\
+  rsave (134, VREGS + 21*4);						\
+  rsave (135, VREGS + 22*4);						\
+  rsave (136, VREGS + 23*4);						\
+  rsave (137, VREGS + 24*4);						\
+  rsave (138, VREGS + 25*4);						\
+  rsave (139, VREGS + 26*4);						\
+  rsave (140, VREGS + 27*4);						\
+  rsave (141, VREGS + 28*4);						\
+  rsave (142, VREGS + 29*4);						\
+  rsave (143, VREGS + 30*4);						\
+  rsave (144, VREGS + 31*4);
 #else
 #define EH_FRAME_VMX
 #endif
-- 
1.6.0.2.GIT

Re: [PATCH] Add unwind information for SPE registers of E500 core

[Kumar Gala]

On Mar 3, 2009, at 10:51 PM, Liming Wang wrote:

> SPE registers use the high part bit0~bit31 of E500 GPR0~GPR31.
> The unwind information in "eh_frame" section is used during exception
> handling and describes register information in the signal frame. But
> current unwind information doesn't cover SPE registers, which have
> been saved in the signal frame. This patch adds this unwind  
> information
> to "eh_frame" section.
>
> SPE registers use register number 1200+N to identify register 'N', but
> they start from 113 in unwind column, which is computed from gcc
> source code, macro DWARF_REG_TO_UNWIND_COLUMN:
>
> 	#define FIRST_PSEUDO_REGISTER 114
> 	#define DWARF_REG_TO_UNWIND_COLUMN(r) \
>  	  ((r) > 1200 ? ((r) - 1200 + FIRST_PSEUDO_REGISTER - 1) : (r))
>
> Signed-off-by: Liming Wang <liming.wang@windriver.com>
> ---
> arch/powerpc/kernel/vdso32/sigtramp.S |   34 ++++++++++++++++++++++++ 
> +++++++++
> 1 files changed, 34 insertions(+), 0 deletions(-)

What about SPEFSCR & the accumulator?  Are they not part of the  
frame?  They probably should be.

> diff --git a/arch/powerpc/kernel/vdso32/sigtramp.S b/arch/powerpc/ 
> kernel/vdso32/sigtramp.S
> index 68d49dd..789a343 100644
> --- a/arch/powerpc/kernel/vdso32/sigtramp.S
> +++ b/arch/powerpc/kernel/vdso32/sigtramp.S
> @@ -251,6 +251,40 @@ V_FUNCTION_END(__kernel_sigtramp_rt32)
>   vsave_msr1 (31);							\
>   vsave_msr2 (33, 32*16+12);						\
>   vsave      (32, 32*16)
> +#elif defined(CONFIG_SPE)
> +#define EH_FRAME_VMX \

introduce EH_FRAME_SPE.

> +  rsave (113, VREGS);							\

we should probably be doing the same thing as vsave_msr1()

- k