diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S deleted file mode 100644 index ff2ed265ee..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S +++ /dev/null @@ -1,187 +0,0 @@ -/* Create new context. - Copyright (C) 2002-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#include <sysdep.h> - -#define __ASSEMBLY__ -#include <asm/ptrace.h> -#include "ucontext_i.h" -#include <asm/errno.h> - -ENTRY(__makecontext) - CALL_MCOUNT 3 - /* 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) - cfi_offset (lr, FRAME_LR_SAVE) - stdu r1,-128(r1) - cfi_adjust_cfa_offset (128) - - /* 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,-64(r7) - std r3,FRAME_PARM1_SAVE(r7) /* Store context in dummy parm1. */ - 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): - -#if _CALL_ELF != 2 - /* 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) -#else - /* In the ELFv2 ABI, the function pointer is already the address. - Store it as NIP and r12 as required by the ABI. */ - std r4,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3) - std r4,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r3) -#endif - - /* 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). - Use this conditional form of branch and link to avoid destroying - the cpu link stack used to predict blr return addresses. */ - bcl 20,31,L(gotexitcodeaddr); - - /* End FDE now, because while executing on the context's stack - the unwind info would be wrong otherwise. */ - cfi_endproc - - /* 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_PARM1_SAVE(r1) - ld r2,FRAME_TOC_SAVE(r1) - ld r3,UCONTEXT_LINK(r3) /* Load the resume context. */ - cmpdi r3,0 - beq L(do_exit) - bl JUMPTARGET(__setcontext) - nop - /* If setcontext returns (which can happen if the syscall fails) we will - exit the program with error status (-1). */ - li r3,-1 -L(do_exit): -#ifdef SHARED - b JUMPTARGET(__GI_exit); -#else - b JUMPTARGET(exit); - nop -#endif - b L(do_exit) - - /* Re-establish FDE for the rest of the actual makecontext routine. */ - cfi_startproc - cfi_offset (lr, FRAME_LR_SAVE) - cfi_adjust_cfa_offset (128) - - /* 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) |