diff options
Diffstat (limited to 'private/crt32/misc/alpha/otsjmp.s')
| -rw-r--r-- | private/crt32/misc/alpha/otsjmp.s | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/private/crt32/misc/alpha/otsjmp.s b/private/crt32/misc/alpha/otsjmp.s new file mode 100644 index 000000000..9c49751f9 --- /dev/null +++ b/private/crt32/misc/alpha/otsjmp.s @@ -0,0 +1,117 @@ +// TITLE("Set Jump") +//++ +// +// Copyright (c) 1993 Digital Equipment Corporation +// +// Module Name: +// +// otsjmp.s +// +// Abstract: +// +// This module implements the Alpha C8/GEM C compiler specific routine to +// perform a setjmp. +// +// N.B. This module conditionally provides UNSAFE handling of setjmp and +// which is NOT integrated with structured exception handling. The +// determination is made based on whether an uninitialized variable +// has been set to a nonzero value. +// +// Author: +// +// Thomas Van Baak (tvb) 22-Apr-1993 +// +// Environment: +// +// Any mode. +// +// Revision History: +// +//-- + +#include "ksalpha.h" + +// +// Define variable that will cause setjmp/longjmp to be safe or unsafe with +// respect to structured exception handling. +// + + .globl _Otssetjmpexused + .comm _Otssetjmpexused, 4 + + SBTTL("Set Jump - GEM version") +//++ +// +// int +// _Otssetjmp3 ( +// IN OUT jmp_buf JumpBuffer, +// IN PVOID RealFramePointer, +// IN PVOID SebPointer +// ) +// +// Routine Description: +// +// This function saves the current nonvolatile register state in the +// specified jump buffer and returns a function value of zero. +// +// N.B. The name `_Otssetjmp3' was chosen to avoid collision with an +// earlier implementation named _Otssetjmp. This version has three +// arguments. +// +// Arguments: +// +// JumpBuffer (a0) - Supplies the address of a jump buffer to store the +// jump information. +// +// RealFramePointer (a1) - Supplies the real frame pointer value. +// +// SebPointer (a2) - Supplies the pointer to the current SEB or NULL +// if the call was made outside of any SEH scope. +// +// Return Value: +// +// A value of zero is returned. +// +//-- + + LEAF_ENTRY(_Otssetjmp3) + + ldl v0, _Otssetjmpexused // get value of switch variable + bne v0, 10f // if ne, provide safe setjmp + +// +// Provide unsafe handling of setjmp. +// + + stt f2, JbFltF2(a0) // save floating registers f2 - f9 + stt f3, JbFltF3(a0) // + stt f4, JbFltF4(a0) // + stt f5, JbFltF5(a0) // + stt f6, JbFltF6(a0) // + stt f7, JbFltF7(a0) // + stt f8, JbFltF8(a0) // + stt f9, JbFltF9(a0) // + + stq s0, JbIntS0(a0) // save integer registers s0 - s6/fp + stq s1, JbIntS1(a0) // + stq s2, JbIntS2(a0) // + stq s3, JbIntS3(a0) // + stq s4, JbIntS4(a0) // + stq s5, JbIntS5(a0) // + stq fp, JbIntS6(a0) // + + ldil t0, 1 // get unsafe setjmp flag + stl t0, JbType(a0) // set jump buffer context type + stq sp, JbIntSp(a0) // save stack pointer + stq ra, JbFir(a0) // get setjmp return address + + mov zero, v0 // set zero return value + ret zero, (ra) // return + +// +// Provide safe handling of setjmp. +// + +10: jmp zero, (v0) // finish in _setjmpex code + + .end _Otssetjmp3 |