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Re: glibc 2.0 and glibc 2.1 ppc development
- To: philb@gnu.org
- Subject: Re: glibc 2.0 and glibc 2.1 ppc development
- From: Geoff Keating <geoffk@ozemail.com.au>
- Date: Mon, 10 Aug 1998 12:20:34 +1000
- CC: Franz.Sirl-kernel@lauterbach.com, kbhend@dogwood.tyler.wm.edu, libc-alpha@cygnus.com
- References: <E0z5YDj-0002lY-00@kings-cross.london.uk.eu.org>
> cc: "Kevin B. Hendricks" <kbhend@dogwood.tyler.wm.edu>, libc-alpha@cygnus.com
> Date: Sun, 09 Aug 1998 17:21:23 +0100
> From: Philip Blundell <philb@gnu.org>
> >as I don't think this is PPC specific, I cc'ed it to libc-alpha. A quick
> >browse in the glibc-2.1 sources showed that no platform seems to save the
> >condition code in jmp_buf. So this is probably a issue with kaffe on all
> >platforms.
>
> The ABI on many platforms states that the condition codes are not preserved
> across function calls, so there is no need to save them. On machines where
> the codes do have to be preserved they are indeed saved in the jmp_buf.
Patch for ppc follows. I haven't fully tested it yet.
--
Geoffrey Keating <geoffk@ozemail.com.au>
===File ~/patches/glibc-15.diff=============================
1998-08-07 Geoff Keating <geoffk@ozemail.com.au>
* sysdeps/powerpc/bits/setjmp.h: Use word to save condition
registers.
* sysdeps/powerpc/setjmp.S: Save condition registers.
* sysdeps/powerpc/__longjmp.S: Restore condition registers.
--- glibc-2.0.95/sysdeps/powerpc/bits/setjmp.h~ Sat May 9 05:23:45 1998
+++ glibc-2.0.95/sysdeps/powerpc/bits/setjmp.h Fri Aug 7 12:45:33 1998
@@ -28,11 +28,11 @@
either representation. */
#if defined __USE_MISC || defined _ASM
-# define JB_GPR1 0 /* also known as the stack pointer */
+# define JB_GPR1 0 /* Also known as the stack pointer */
# define JB_GPR2 1
-# define JB_LR 2
+# define JB_LR 2 /* The address we will return to */
# define JB_GPRS 3 /* GPRs 14 through 31 are saved, 18 in total */
-# define JB_UNUSED 21 /* it's sometimes faster to store doubles word-aligned */
+# define JB_CR 21 /* Condition code registers. */
# define JB_FPRS 22 /* FPRs 14 through 31 are saved, 18*2 words total */
#endif
--- glibc-2.0.95/sysdeps/powerpc/__longjmp.S~ Mon Dec 29 02:10:18 1997
+++ glibc-2.0.95/sysdeps/powerpc/__longjmp.S Fri Aug 7 12:56:02 1998
@@ -45,12 +45,14 @@ ENTRY (__longjmp)
lfd %f21,((JB_FPRS+7*2)*4)(%r3)
lwz %r22,((JB_GPRS+8)*4)(%r3)
lfd %f22,((JB_FPRS+8*2)*4)(%r3)
+ lwz %r0,(JB_CR*4)(%r3)
lwz %r23,((JB_GPRS+9)*4)(%r3)
lfd %f23,((JB_FPRS+9*2)*4)(%r3)
lwz %r24,((JB_GPRS+10)*4)(%r3)
lfd %f24,((JB_FPRS+10*2)*4)(%r3)
lwz %r25,((JB_GPRS+11)*4)(%r3)
lfd %f25,((JB_FPRS+11*2)*4)(%r3)
+ mtcrf 0xFF,%r0
lwz %r26,((JB_GPRS+12)*4)(%r3)
lfd %f26,((JB_FPRS+12*2)*4)(%r3)
lwz %r27,((JB_GPRS+13)*4)(%r3)
--- glibc-2.0.95/sysdeps/powerpc/setjmp.S~ Mon Dec 29 02:10:52 1997
+++ glibc-2.0.95/sysdeps/powerpc/setjmp.S Fri Aug 7 12:45:46 1998
@@ -31,8 +31,10 @@ ENTRY (__sigsetjmp)
stw %r0,(JB_LR*4)(3)
stw %r15,((JB_GPRS+1)*4)(3)
stfd %f15,((JB_FPRS+1*2)*4)(3)
+ mfcr %r0
stw %r16,((JB_GPRS+2)*4)(3)
stfd %f16,((JB_FPRS+2*2)*4)(3)
+ stw %r0,(JB_CR*4)(3)
stw %r17,((JB_GPRS+3)*4)(3)
stfd %f17,((JB_FPRS+3*2)*4)(3)
stw %r18,((JB_GPRS+4)*4)(3)
============================================================