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authorUlrich Drepper <drepper@redhat.com>2003-01-17 01:02:24 +0000
committerUlrich Drepper <drepper@redhat.com>2003-01-17 01:02:24 +0000
commit609b4783564008cafdeb947bfd613a1bcb5946f6 (patch)
treeec4d830d2bf9d55decdf5bc941ececfe91e71d7d /sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
parent7b7b9e70ea0d820c863c78fbf84fe52626a408d6 (diff)
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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.
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S')
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S161
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
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+++ 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)