Update.

2003-06-17  Paul Mackerras  <paulus@samba.org>

	* sysdeps/unix/sysv/linux/powerpc/powerpc32/getcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/ucontext_i.h: New file.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h: Adjust.

1 files changed, 233 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S
new file mode 100644
index 0000000000..88cf0dae8f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S
@@ -0,0 +1,233 @@
+/* Save current context and jump to a new context.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+
+#define __ASSEMBLY__
+#include <asm/ptrace.h>
+#include "ucontext_i.h"
+
+ENTRY(__swapcontext)
+	/* Save the current context */
+	stw	r0,_UC_GREGS+(PT_R0*4)(r3)
+	stw	r1,_UC_GREGS+(PT_R1*4)(r3)
+	mflr	r0
+	stwu	r1,-16(r1)
+	stw	r0,20(r1)
+	stw	r31,12(r1)
+	stw	r31,_UC_GREGS+(PT_R31*4)(r3)
+	mr	r31,r4			/* new context pointer */
+	stw	r0,_UC_GREGS+(PT_LNK*4)(r3)
+	stw	r0,_UC_GREGS+(PT_NIP*4)(r3)
+	stw	r2,_UC_GREGS+(PT_R2*4)(r3)
+	stw	r4,_UC_GREGS+(PT_R4*4)(r3)
+	stw	r5,_UC_GREGS+(PT_R5*4)(r3)
+	stw	r6,_UC_GREGS+(PT_R6*4)(r3)
+	stw	r7,_UC_GREGS+(PT_R7*4)(r3)
+	stw	r8,_UC_GREGS+(PT_R8*4)(r3)
+	stw	r9,_UC_GREGS+(PT_R9*4)(r3)
+	stw	r10,_UC_GREGS+(PT_R10*4)(r3)
+	stw	r11,_UC_GREGS+(PT_R11*4)(r3)
+	stw	r12,_UC_GREGS+(PT_R12*4)(r3)
+	stw	r13,_UC_GREGS+(PT_R13*4)(r3)
+	stw	r14,_UC_GREGS+(PT_R14*4)(r3)
+	stw	r15,_UC_GREGS+(PT_R15*4)(r3)
+	stw	r16,_UC_GREGS+(PT_R16*4)(r3)
+	stw	r17,_UC_GREGS+(PT_R17*4)(r3)
+	stw	r18,_UC_GREGS+(PT_R18*4)(r3)
+	stw	r19,_UC_GREGS+(PT_R19*4)(r3)
+	stw	r20,_UC_GREGS+(PT_R20*4)(r3)
+	stw	r21,_UC_GREGS+(PT_R21*4)(r3)
+	stw	r22,_UC_GREGS+(PT_R22*4)(r3)
+	stw	r23,_UC_GREGS+(PT_R23*4)(r3)
+	stw	r24,_UC_GREGS+(PT_R24*4)(r3)
+	stw	r25,_UC_GREGS+(PT_R25*4)(r3)
+	stw	r26,_UC_GREGS+(PT_R26*4)(r3)
+	stw	r27,_UC_GREGS+(PT_R27*4)(r3)
+	stw	r28,_UC_GREGS+(PT_R28*4)(r3)
+	stw	r29,_UC_GREGS+(PT_R29*4)(r3)
+	stw	r30,_UC_GREGS+(PT_R30*4)(r3)
+	mfctr	r0
+	stw	r0,_UC_GREGS+(PT_CTR*4)(r3)
+	mfxer	r0
+	stw	r0,_UC_GREGS+(PT_XER*4)(r3)
+	mfcr	r0
+	stw	r0,_UC_GREGS+(PT_CCR*4)(r3)
+
+	/* Set the return value of swapcontext to "success".  R3 is the only 
+	   register whose value is not preserved in the saved context.  */
+	li	r0,0
+	stw	r0,_UC_GREGS+(PT_R3*4)(r3)
+
+	/* Zero fill fields that can't be set in user state. */
+	stw	r0,_UC_GREGS+(PT_MSR*4)(r3)
+	stw	r0,_UC_GREGS+(PT_MQ*4)(r3)
+
+	/* Save the floating-point registers */
+	stfd	fp0,_UC_FREGS+(0*8)(r3)
+	stfd	fp1,_UC_FREGS+(1*8)(r3)
+	stfd	fp2,_UC_FREGS+(2*8)(r3)
+	stfd	fp3,_UC_FREGS+(3*8)(r3)
+	stfd	fp4,_UC_FREGS+(4*8)(r3)
+	stfd	fp5,_UC_FREGS+(5*8)(r3)
+	stfd	fp6,_UC_FREGS+(6*8)(r3)
+	stfd	fp7,_UC_FREGS+(7*8)(r3)
+	stfd	fp8,_UC_FREGS+(8*8)(r3)
+	stfd	fp9,_UC_FREGS+(9*8)(r3)
+	stfd	fp10,_UC_FREGS+(10*8)(r3)
+	stfd	fp11,_UC_FREGS+(11*8)(r3)
+	stfd	fp12,_UC_FREGS+(12*8)(r3)
+	stfd	fp13,_UC_FREGS+(13*8)(r3)
+	stfd	fp14,_UC_FREGS+(14*8)(r3)
+	stfd	fp15,_UC_FREGS+(15*8)(r3)
+	stfd	fp16,_UC_FREGS+(16*8)(r3)
+	stfd	fp17,_UC_FREGS+(17*8)(r3)
+	stfd	fp18,_UC_FREGS+(18*8)(r3)
+	stfd	fp19,_UC_FREGS+(19*8)(r3)
+	stfd	fp20,_UC_FREGS+(20*8)(r3)
+	stfd	fp21,_UC_FREGS+(21*8)(r3)
+	stfd	fp22,_UC_FREGS+(22*8)(r3)
+	stfd	fp23,_UC_FREGS+(23*8)(r3)
+	stfd	fp24,_UC_FREGS+(24*8)(r3)
+	stfd	fp25,_UC_FREGS+(25*8)(r3)
+	stfd	fp26,_UC_FREGS+(26*8)(r3)
+	stfd	fp27,_UC_FREGS+(27*8)(r3)
+	stfd	fp28,_UC_FREGS+(28*8)(r3)
+	stfd	fp29,_UC_FREGS+(29*8)(r3)
+	mffs	fp0
+	stfd	fp30,_UC_FREGS+(30*8)(r3)
+	stfd	fp31,_UC_FREGS+(31*8)(r3)
+	stfd	fp0,_UC_FREGS+(32*8)(r3)
+
+	addi	r5,r3,_UC_SIGMASK
+	addi	r4,r4,_UC_SIGMASK
+	li	r3,SIG_SETMASK
+	bl	JUMPTARGET(sigprocmask)
+	cmpwi	r3,0
+	bne	L(error_exit)
+
+	/*
+	 * If the new ucontext refers to the point where we were interrupted
+	 * by a signal, we have to use the rt_sigreturn system call to
+	 * return to the context so we get both LR and CTR restored.
+	 *
+	 * Otherwise, the context we are restoring is either just after
+	 * a procedure call (getcontext/swapcontext) or at the beginning
+	 * of a procedure call (makecontext), so we don't need to restore
+	 * r0, xer, ctr.  We don't restore r2 since it will be used as
+	 * the TLS pointer.
+	 */
+	lwz	r0,_UC_GREGS+(PT_MSR*4)(r31)
+	cmpwi	r0,0
+	bne	L(do_sigret)
+
+	/* Restore the floating-point registers */
+	lfd	fp31,_UC_FREGS+(32*8)(r31)
+	lfd	fp0,_UC_FREGS+(0*8)(r31)
+	mtfsf	0xff,fp31
+	lfd	fp1,_UC_FREGS+(1*8)(r31)
+	lfd	fp2,_UC_FREGS+(2*8)(r31)
+	lfd	fp3,_UC_FREGS+(3*8)(r31)
+	lfd	fp4,_UC_FREGS+(4*8)(r31)
+	lfd	fp5,_UC_FREGS+(5*8)(r31)
+	lfd	fp6,_UC_FREGS+(6*8)(r31)
+	lfd	fp7,_UC_FREGS+(7*8)(r31)
+	lfd	fp8,_UC_FREGS+(8*8)(r31)
+	lfd	fp9,_UC_FREGS+(9*8)(r31)
+	lfd	fp10,_UC_FREGS+(10*8)(r31)
+	lfd	fp11,_UC_FREGS+(11*8)(r31)
+	lfd	fp12,_UC_FREGS+(12*8)(r31)
+	lfd	fp13,_UC_FREGS+(13*8)(r31)
+	lfd	fp14,_UC_FREGS+(14*8)(r31)
+	lfd	fp15,_UC_FREGS+(15*8)(r31)
+	lfd	fp16,_UC_FREGS+(16*8)(r31)
+	lfd	fp17,_UC_FREGS+(17*8)(r31)
+	lfd	fp18,_UC_FREGS+(18*8)(r31)
+	lfd	fp19,_UC_FREGS+(19*8)(r31)
+	lfd	fp20,_UC_FREGS+(20*8)(r31)
+	lfd	fp21,_UC_FREGS+(21*8)(r31)
+	lfd	fp22,_UC_FREGS+(22*8)(r31)
+	lfd	fp23,_UC_FREGS+(23*8)(r31)
+	lfd	fp24,_UC_FREGS+(24*8)(r31)
+	lfd	fp25,_UC_FREGS+(25*8)(r31)
+	lfd	fp26,_UC_FREGS+(26*8)(r31)
+	lfd	fp27,_UC_FREGS+(27*8)(r31)
+	lfd	fp28,_UC_FREGS+(28*8)(r31)
+	lfd	fp29,_UC_FREGS+(29*8)(r31)
+	lfd	fp30,_UC_FREGS+(30*8)(r31)
+	lfd	fp31,_UC_FREGS+(31*8)(r31)
+
+	/* Restore LR and CCR, and set CTR to the NIP value */
+	lwz	r3,_UC_GREGS+(PT_LNK*4)(r31)
+	lwz	r4,_UC_GREGS+(PT_NIP*4)(r31)
+	lwz	r5,_UC_GREGS+(PT_CCR*4)(r31)
+	mtlr	r3
+	mtctr	r4
+	mtcr	r5
+
+	/* Restore the general registers */
+	lwz	r1,_UC_GREGS+(PT_R1*4)(r31)
+	lwz	r3,_UC_GREGS+(PT_R3*4)(r31)
+	lwz	r4,_UC_GREGS+(PT_R4*4)(r31)
+	lwz	r5,_UC_GREGS+(PT_R5*4)(r31)
+	lwz	r6,_UC_GREGS+(PT_R6*4)(r31)
+	lwz	r7,_UC_GREGS+(PT_R7*4)(r31)
+	lwz	r8,_UC_GREGS+(PT_R8*4)(r31)
+	lwz	r9,_UC_GREGS+(PT_R9*4)(r31)
+	lwz	r10,_UC_GREGS+(PT_R10*4)(r31)
+	lwz	r11,_UC_GREGS+(PT_R11*4)(r31)
+	lwz	r12,_UC_GREGS+(PT_R12*4)(r31)
+	lwz	r13,_UC_GREGS+(PT_R13*4)(r31)
+	lwz	r14,_UC_GREGS+(PT_R14*4)(r31)
+	lwz	r15,_UC_GREGS+(PT_R15*4)(r31)
+	lwz	r16,_UC_GREGS+(PT_R16*4)(r31)
+	lwz	r17,_UC_GREGS+(PT_R17*4)(r31)
+	lwz	r18,_UC_GREGS+(PT_R18*4)(r31)
+	lwz	r19,_UC_GREGS+(PT_R19*4)(r31)
+	lwz	r20,_UC_GREGS+(PT_R20*4)(r31)
+	lwz	r21,_UC_GREGS+(PT_R21*4)(r31)
+	lwz	r22,_UC_GREGS+(PT_R22*4)(r31)
+	lwz	r23,_UC_GREGS+(PT_R23*4)(r31)
+	lwz	r24,_UC_GREGS+(PT_R24*4)(r31)
+	lwz	r25,_UC_GREGS+(PT_R25*4)(r31)
+	lwz	r26,_UC_GREGS+(PT_R26*4)(r31)
+	lwz	r27,_UC_GREGS+(PT_R27*4)(r31)
+	lwz	r28,_UC_GREGS+(PT_R28*4)(r31)
+	lwz	r29,_UC_GREGS+(PT_R29*4)(r31)
+	lwz	r30,_UC_GREGS+(PT_R30*4)(r31)
+	lwz	r31,_UC_GREGS+(PT_R31*4)(r31)
+
+	bctr
+
+L(error_exit):
+	lwz	r31,12(r1)
+	lwz	r0,20(r1)
+	addi	r1,r1,16
+	mtlr	r0
+	blr
+
+L(do_sigret):
+	addi	r1,r31,-0xd0
+	li	r0,SYS_ify(rt_sigreturn)
+	sc
+	/* NOTREACHED */
+
+PSEUDO_END(__swapcontext)
+
+weak_alias(__swapcontext, swapcontext)