116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
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/****************************************************************
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* *
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* Copyright 2003, 2010 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_string.h"
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#include "urx.h"
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#include "rtnhdr.h"
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#include "stack_frame.h"
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#include "op.h"
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#include "auto_zlink.h"
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GBLREF unsigned char *obpt; /* output buffer index */
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GBLREF stack_frame *frame_pointer;
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IA64_ONLY(GBLREF uint8 imm14;)
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IA64_ONLY(GBLREF char asm_mode;)
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/* Due to the complex instruction set of x86_64, we require a function to implement the macro VALID_CALLING_SEQUENCE
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and this function will calculate both the offsets (rtnhdr & labaddr) and store them into these global variables */
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#if defined(__x86_64__) || defined(__MVS__) || defined(Linux390)
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GBLDEF int4 rtnhdr_off;
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GBLDEF int4 labaddr_off;
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#endif
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rhdtyp *auto_zlink(mach_inst *pc, lnr_tabent ***line)
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{
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lnk_tabent *A_rtnhdr;
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lnk_tabent *A_labaddr;
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mstr rname;
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mident_fixed rname_buff;
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mval rtn;
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rhdtyp *rhead;
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urx_rtnref *rtnurx;
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error_def (ERR_LABELUNKNOWN);
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error_def (ERR_ROUTINEUNKNOWN);
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/* (ASSUMPTION)
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* The instructions immediately preceding the current mpc form a transfer table call.
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* There will be two arguments to this call:
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* the address of a routine header and
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* the address of a pointer to a value which is the offset from the beginning of the routine header
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* to the address of the first instruction to be executed in the routine to be called, as
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* specified by the [label][+offset] field (or the beginning of the routine if label and
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* offset are not specified)
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* We compute the linkage table offsets of both parameters by disassembling the load instructions that were
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* generated to load arguments. The entire instruction sequence is platform dependent (see auto_zlink_sp.h).
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*
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* N.B., the instruction sequence above occurs in compiled object modules; in direct mode, the argument
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* registers are loaded via "load" instructions. However, this routine should never be invoked from direct
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* mode because the applicable routine should have been ZLINK'ed by prior calls to op_labaddr and op_rhdaddr.
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*/
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NON_IA64_ONLY(if (!VALID_CALLING_SEQUENCE(pc)))
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NON_IA64_ONLY(GTMASSERT;)
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/* Calling sequence O.K.; get address(address(routine header)) and address(address(label offset)). */
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# ifdef __ia64 /* __ia64 */
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{
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uint8 imm;
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int8 *buf2, i;
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ia64_bundle bundle;
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uint8 dummy, dummy2, dummy1;
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int isMovl = 0;
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RTNHDR_PV_OFF(pc,imm);
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A_rtnhdr = (lnk_tabent *)(imm + frame_pointer->ctxt);
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dummy1 = dummy; /* For silly compiler warning */
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LABADDR_PV_OFF(pc, imm);
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A_labaddr = (lnk_tabent *)(imm + frame_pointer->ctxt);
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}
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# endif /* __ia64 */
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NON_IA64_ONLY(A_rtnhdr = (lnk_tabent *)(RTNHDR_PV_OFF(pc) + frame_pointer->ctxt);)
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NON_IA64_ONLY(A_labaddr = (lnk_tabent *)(LABADDR_PV_OFF(pc) + frame_pointer->ctxt);)
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if (azl_geturxrtn((char *)A_rtnhdr, &rname, &rtnurx))
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{
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assert(rname.len <= MAX_MIDENT_LEN);
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assert(0 != rname.addr);
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/* Copy rname into local storage because azl_geturxrtn sets rname.addr to an address that is
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* free'd during op_zlink and before the call to find_rtn_hdr.
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*/
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memcpy(rname_buff.c, rname.addr, rname.len);
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rname.addr = rname_buff.c;
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assert(0 != rtnurx);
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assert(azl_geturxlab((char *)A_labaddr, rtnurx));
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assert(0 == find_rtn_hdr(&rname));
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rtn.mvtype = MV_STR;
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rtn.str.len = rname.len;
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rtn.str.addr = rname.addr;
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op_zlink(&rtn, 0);
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if (0 != (rhead = find_rtn_hdr(&rname)))
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{ /* Pull the linkage table reference out and return it to caller */
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*line = (lnr_tabent **)(A_labaddr->ext_ref);
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if (0 == *line)
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rts_error(VARLSTCNT(1) ERR_LABELUNKNOWN);
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return rhead;
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}
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}
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rts_error(VARLSTCNT(1) ERR_ROUTINEUNKNOWN);
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return NULL; /* Compiler happiness phase */
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}
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