124 lines
4.2 KiB
C
124 lines
4.2 KiB
C
/* Static condition handler for Alpha/VMS.
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Copyright (C) 2005-2013 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file implements __gcc_shell_handler, the static VMS condition handler
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used as the indirection wrapper around user level handlers installed with
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establish_vms_condition_handler GCC builtin.
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[ABI] in comments refers to the "HP OpenVMS calling standard" document
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dated January 2005. */
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#include <vms/chfdef.h>
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#include <vms/pdscdef.h>
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#include <vms/ssdef.h>
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typedef void * ADDR;
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typedef unsigned long long REG;
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#define REG_AT(addr) (*(REG *)(addr))
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/* Compute pointer to procedure descriptor (Procedure Value) from Frame
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Pointer FP, according to the rules in [ABI-3.5.1 Current Procedure]. */
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#define PV_FOR(FP) \
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(((FP) != 0) \
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? (((REG_AT (FP) & 0x7) == 0) ? *(PDSCDEF **)(FP) : (PDSCDEF *)(FP)) : 0)
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long
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__gcc_shell_handler (struct chf$signal_array *sig_arr,
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struct chf$mech_array *mech_arr);
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/* Helper for __gcc_shell_handler. Fetch the pointer to procedure currently
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registered as the VMS condition handler for the live function with a frame
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pointer FP. */
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static ADDR
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get_dyn_handler_pointer (REG fp)
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{
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/* From the frame pointer we find the procedure descriptor, and fetch
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the handler_data field from there. This field contains the offset
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from FP at which the address of the currently installed handler is
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to be found. */
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PDSCDEF * pd = PV_FOR (fp);
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/* Procedure descriptor pointer for the live subprogram with FP as the frame
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pointer, and to which _gcc_shell_handler is attached as a condition
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handler. */
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REG handler_slot_offset;
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/* Offset from FP at which the address of the currently established real
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condition handler is to be found. This offset is available from the
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handler_data field of the procedure descriptor. */
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REG handler_data_offset;
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/* The handler_data field position in the procedure descriptor, which
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depends on the kind of procedure at hand. */
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switch (pd->pdsc$w_flags & 0xf)
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{
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case PDSC$K_KIND_FP_STACK: /* [3.4.2 PD for stack frame procedures] */
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handler_data_offset = 40;
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break;
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case PDSC$K_KIND_FP_REGISTER: /* [3.4.5 PD for reg frame procedures] */
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handler_data_offset = 32;
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break;
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default:
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handler_data_offset = 0;
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break;
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}
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/* If we couldn't determine the handler_data field position, give up. */
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if (handler_data_offset == 0)
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return 0;
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/* Otherwise, fetch the fp offset at which the real handler address is to be
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found, then fetch and return the latter in turn. */
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handler_slot_offset = REG_AT ((REG)pd + handler_data_offset);
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return (ADDR) REG_AT (fp + handler_slot_offset);
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}
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/* The static VMS condition handler for GCC code. Fetch the address of the
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currently established condition handler, then resignal if there is none or
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call the handler with the VMS condition arguments. */
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long
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__gcc_shell_handler (struct chf$signal_array *sig_arr,
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struct chf$mech_array *mech_arr)
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{
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long ret;
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long (*user_handler) (struct chf$signal_array *, struct chf$mech_array *);
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user_handler = get_dyn_handler_pointer (mech_arr->chf$q_mch_frame);
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if (!user_handler)
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ret = SS$_RESIGNAL;
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else
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ret = user_handler (sig_arr, mech_arr);
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return ret;
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}
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