diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S | 66 |
1 files changed, 35 insertions, 31 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S index bad67193d8..adfeb3ee72 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S @@ -41,12 +41,12 @@ ENTRY(__makecontext) 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 + 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 + "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) @@ -59,38 +59,38 @@ ENTRY(__makecontext) 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 + 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 + 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 + + 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 + + /* 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 + 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. */ + save area of the context frame. */ cmpdi r5,0 beq L(noparms) mr r0,r5 ble cr1,L(le8) li r0,8 -L(le8): +L(le8): mtctr r0 addi r7,r6,-8 addi r9,r3,(SIGCONTEXT_GP_REGS+(PT_R3*8)-8) @@ -98,29 +98,29 @@ L(parmloop2): ldu r0,8(r7) stdu r0,8(r9) bdnz L(parmloop2) - - addi r0,r5,-8 - ble cr1,L(noparms) + + 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 + 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) + 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). */ @@ -147,15 +147,19 @@ L(BADSTATUS): /* If setcontext returns (which can happen if the syscall fails) we will exit the program with error status (-1). */ li r3,-1 +#ifdef SHARED + b JUMPTARGET(__GI_exit); +#else b JUMPTARGET(exit); - +#endif + /* 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 + 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) + ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 blr @@ -168,7 +172,7 @@ L(gotexitcodeaddr): bl JUMPTARGET(__syscall_error) nop li r3,-1 - ld r0,128+FRAME_LR_SAVE(r1) + ld r0,128+FRAME_LR_SAVE(r1) addi r1,r1,128 mtlr r0 blr |