[PATCH 1/2] Make setjmp/longjmp code generic
Michael Ellerman
michael at ellerman.id.au
Thu Dec 13 09:56:55 EST 2007
On Wed, 2007-12-12 at 16:45 +1100, Michael Neuling wrote:
> This makes the setjmp/longjmp code used by xmon, generically available
> to other code. It also removes the requirement for debugger hooks to
> be only called on 0x300 (data storage) exception.
>
> Signed-off-by: Michael Neuling <mikey at neuling.org>
> ---
>
> arch/powerpc/kernel/misc_64.S | 124 ++++++++++++++++++++++++++++++++++++++
> arch/powerpc/mm/fault.c | 6 -
> arch/powerpc/xmon/Makefile | 2
> arch/powerpc/xmon/setjmp.S | 135 ------------------------------------------
> arch/powerpc/xmon/xmon.c | 10 ---
> include/asm-powerpc/setjmp.h | 12 +++
> 6 files changed, 142 insertions(+), 147 deletions(-)
>
> Index: linux-2.6-ozlabs/arch/powerpc/kernel/misc_64.S
> ===================================================================
> --- linux-2.6-ozlabs.orig/arch/powerpc/kernel/misc_64.S
> +++ linux-2.6-ozlabs/arch/powerpc/kernel/misc_64.S
> @@ -518,6 +518,130 @@ _GLOBAL(giveup_altivec)
>
> #endif /* CONFIG_ALTIVEC */
>
> +_GLOBAL(setjmp)
> + mflr r0
> + PPC_STL r0,0(r3)
> + PPC_STL r1,SZL(r3)
> + PPC_STL r2,2*SZL(r3)
> + mfcr r0
> + PPC_STL r0,3*SZL(r3)
> + PPC_STL r13,4*SZL(r3)
> + PPC_STL r14,5*SZL(r3)
> + PPC_STL r15,6*SZL(r3)
> + PPC_STL r16,7*SZL(r3)
> + PPC_STL r17,8*SZL(r3)
> + PPC_STL r18,9*SZL(r3)
> + PPC_STL r19,10*SZL(r3)
> + PPC_STL r20,11*SZL(r3)
> + PPC_STL r21,12*SZL(r3)
> + PPC_STL r22,13*SZL(r3)
> + PPC_STL r23,14*SZL(r3)
> + PPC_STL r24,15*SZL(r3)
> + PPC_STL r25,16*SZL(r3)
> + PPC_STL r26,17*SZL(r3)
> + PPC_STL r27,18*SZL(r3)
> + PPC_STL r28,19*SZL(r3)
> + PPC_STL r29,20*SZL(r3)
> + PPC_STL r30,21*SZL(r3)
> + PPC_STL r31,22*SZL(r3)
> + li r3,0
> + blr
> +
> +_GLOBAL(longjmp)
> + PPC_LCMPI r4,0
> + bne 1f
> + li r4,1
> +1: PPC_LL r13,4*SZL(r3)
> + PPC_LL r14,5*SZL(r3)
> + PPC_LL r15,6*SZL(r3)
> + PPC_LL r16,7*SZL(r3)
> + PPC_LL r17,8*SZL(r3)
> + PPC_LL r18,9*SZL(r3)
> + PPC_LL r19,10*SZL(r3)
> + PPC_LL r20,11*SZL(r3)
> + PPC_LL r21,12*SZL(r3)
> + PPC_LL r22,13*SZL(r3)
> + PPC_LL r23,14*SZL(r3)
> + PPC_LL r24,15*SZL(r3)
> + PPC_LL r25,16*SZL(r3)
> + PPC_LL r26,17*SZL(r3)
> + PPC_LL r27,18*SZL(r3)
> + PPC_LL r28,19*SZL(r3)
> + PPC_LL r29,20*SZL(r3)
> + PPC_LL r30,21*SZL(r3)
> + PPC_LL r31,22*SZL(r3)
> + PPC_LL r0,3*SZL(r3)
> + mtcrf 0x38,r0
> + PPC_LL r0,0(r3)
> + PPC_LL r1,SZL(r3)
> + PPC_LL r2,2*SZL(r3)
> + mtlr r0
> + mr r3,r4
> + blr
> +
> +#ifdef CONFIG_XMON
> +/*
> + * Grab the register values as they are now.
> + * This won't do a particularily good job because we really
> + * want our caller's caller's registers, and our caller has
> + * already executed its prologue.
> + * ToDo: We could reach back into the caller's save area to do
> + * a better job of representing the caller's state (note that
> + * that will be different for 32-bit and 64-bit, because of the
> + * different ABIs, though).
> + */
> +_GLOBAL(xmon_save_regs)
> + PPC_STL r0,0*SZL(r3)
> + PPC_STL r2,2*SZL(r3)
> + PPC_STL r3,3*SZL(r3)
> + PPC_STL r4,4*SZL(r3)
Does xmon_save_regs belong here?
cheers
--
Michael Ellerman
OzLabs, IBM Australia Development Lab
wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)
We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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