Update.

2003-01-16  Steven Munroe  <sjmunroe@us.ibm.com>

	* sysdeps/unix/sysv/linux/powerpc/powerpc64/getcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S: New file.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/ucontext_i.h: New file.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h: New file.
	* sysdeps/unix/sysv/linux/configure.in: Minimum kernel for PPC64
	is 2.4.21.

2003-01-16  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/generic/glob.c (glob): Assume sysconf() always returns
	values != -1 for _LIBC.  Use extend_alloca to reallocate alloca'ed
	buffers.

	* sysdeps/generic/sysconf.c: Unconditionally implement
	_SC_GETPW_R_SIZE_MAX and _SC_GETGR_R_SIZE_MAX.
	* sysdeps/posix/sysconf.c: Likewise.

1 files changed, 161 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
new file mode 100644
index 0000000000..29dd17ffe4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
@@ -0,0 +1,161 @@
+/* Create 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(__makecontext)
+  /* Save parameters into the parameter save area of callers frame.  */
+  std  r3,FRAME_PARM1_SAVE(r1) /* ucontext_t *ucp  */
+  std  r4,FRAME_PARM2_SAVE(r1) /* void (*func)(void)  */
+  std  r5,FRAME_PARM3_SAVE(r1) /* int argc  */
+  std  r6,FRAME_PARM4_SAVE(r1) /* ... */
+  std  r7,FRAME_PARM5_SAVE(r1)
+  std  r8,FRAME_PARM6_SAVE(r1)
+  std  r9,FRAME_PARM7_SAVE(r1)
+  std  r10,FRAME_PARM8_SAVE(r1)
+  mflr  r0
+  /* Get the address of the target functions first parameter.  */
+  addi  r6,r1,FRAME_PARM4_SAVE
+  std   r0,FRAME_LR_SAVE(r1)
+  stdu  r1,-128(r1)
+  
+  /* Get the ucontexts stack pointer and size.  Compute the top of stack
+     and round down to a quadword boundary.  Then stack a dummy frame 
+     with a null back chain.  We store the context pointer in the frames
+     "compiler double word" field so we can recover if is the function 
+     returns.  Finally save the callers link register and TOC pointer 
+     into this frame so the debugger can display a backtrace.
+  */
+  ld    r7,UCONTEXT_STACK_SP(r3)
+  ld    r0,UCONTEXT_STACK_SIZE(r3)
+  add   r7,r7,r0
+  clrrdi  r7,r7,4
+  li    r0,0
+  stdu  r0,-48(r7)
+  std   r3,24(r7)
+  mflr  r0
+  std   r2,FRAME_TOC_SAVE(r7)  /* Store the TOC pointer for later.  */
+  std   r0,FRAME_LR_SAVE(r7)
+  
+  /* Now we need to stack another frame to hold the parameter save area
+     for the function.  We need to allocate a frame with the minimum 48 
+     byte header and 8 parameter register.  However if there are more 
+     than 8 parameters addition space is need to hold all the parameters.
+     The total size it rounded up to a quadword multiple then a frame is 
+     stacked.  This address is stored in the ucontext as GPR 1.  */
+     
+  cmpdi cr1,r5,8  
+  sldi  r8,r5,3
+  bgt   cr1,L(gt8)
+  li    r8,64
+L(gt8):
+  addi  r8,r8,FRAME_PARM_SAVE+8 /* Add header plus rounding factor.  */
+  clrrdi  r8,r8,4  /* Round down to quadword.  */
+  
+  subf  r8,r8,r7
+  std   r7,0(r8)   /* Stack the frame.  */
+  std   r8,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3)
+  
+  /* Now we need to copy the target functions parameters.  The functions 
+     parameters are saved in the parameter save area.  We skip over the
+     first three parameters and copy up to 8 double word into the 
+     SIGCONTEXT_GP_REGS starting with R3.  If there are more than 8 
+     parameters then doublewords 8-N are copied into the parameter
+     save area of the context frame.  */ 
+  cmpdi r5,0
+  beq   L(noparms)
+  mr    r0,r5
+  ble   cr1,L(le8)
+  li    r0,8
+L(le8):    
+  mtctr r0
+  addi  r7,r6,-8
+  addi  r9,r3,(SIGCONTEXT_GP_REGS+(PT_R3*8)-8)
+L(parmloop2):
+  ldu   r0,8(r7)
+  stdu  r0,8(r9)
+  bdnz  L(parmloop2)
+  
+  addi  r0,r5,-8 
+  ble   cr1,L(noparms) 
+  mtctr r0
+  addi  r9,r8,FRAME_PARM9_SAVE-8
+L(parmloop):
+  ldu   r0,8(r7)
+  stdu  r0,8(r9)
+  bdnz  L(parmloop)
+  
+L(noparms):
+  
+  /* Load the function address and TOC from the function descriptor
+     and store them in the ucontext as NIP and r2.  Store the 3rd 
+     field of the function descriptor into the ucontext as r11 in case
+     the calling language needs the "environment pointer".  */
+  ld    r0,0(r4)
+  ld    r10,8(r4);
+  ld    r9,16(r4); 
+  std   r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)  
+  std   r10,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3) 
+  std   r9,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r3)
+  
+  /* If the target function returns we need to do some cleanup.  We use a
+     code trick to get the address of our cleanup function into the link
+     register.  Do not add any code between here and L(exitcode).  */
+  bl  L(gotexitcodeaddr);
+
+	/* This is the helper code which gets called if a function which
+	   is registered with 'makecontext' returns.  In this case we
+	   have to install the context listed in the uc_link element of
+	   the context 'makecontext' manipulated at the time of the
+	   'makecontext' call.  If the pointer is NULL the process must
+	   terminate.  */
+L(exitcode):
+   /* Recover the ucontext and TOC from the dummy frame.  */
+  ld    r1,FRAME_BACKCHAIN(r1)  /* Unstack the parameter save area frame.  */
+  ld    r3,FRAME_COMPILER_DW(r1)
+  ld    r2,FRAME_TOC_SAVE(r1)
+  ld    r3,UCONTEXT_LINK(r3)  /* Load the resume context.  */
+  cmpdi r3,0
+  beq   L(BADSTATUS)
+	bl    JUMPTARGET(__setcontext)
+	nop
+
+L(BADSTATUS):
+/* If setcontext returns (which can happen if the syscall fails) we will
+   exit the program with error status (-1).  */
+  li    r3,-1
+  b     JUMPTARGET(exit);
+  
+  /* The address of the exit code is in the link register.  Store the lr
+     in the ucontext as LNK so the target function will return to our 
+     exit code.  */
+L(gotexitcodeaddr):
+  mflr  r0
+  std   r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3)
+  ld    r0,128+FRAME_LR_SAVE(r1)  
+  addi  r1,r1,128
+  mtlr  r0
+  blr
+END(__makecontext)
+
+weak_alias(__makecontext, makecontext)