82 lines
3.4 KiB
C
82 lines
3.4 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2009 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 "error.h"
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#include "rtnhdr.h"
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#include "op.h"
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#include "i386.h"
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#include "inst_flush.h"
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#include "gtmci.h"
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#include "gtm_text_alloc.h"
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#define CALL_SIZE 5
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#define CODE_SIZE (3 * CALL_SIZE)
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#define CODE_LINES 3
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/* The code created and returned by make_cimode() is executed in the frame GTM$CI at level 1 of
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* every nested call-in environment. For every M routine being called-in from C, GTM$CI code
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* will setup argument registers/stack and executes the M routine. When the M routine returns
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* from its final QUIT, GTM$CI returns to gtm_ci(). make_cimode generates machine equivalents
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* for the following operations in that order:
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*
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* CALL ci_restart :setup register/stack arguments from 'param_list' and transfer control
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* to op_extcall/op_extexfun which return only after the M routine finishes and QUITs.
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* CALL ci_ret_code :transfer control from the M routine back to C (gtm_ci). Never returns.
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* CALL opp_ret :an implicit QUIT although it is never executed.
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*
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* Before GTM$CI executes, it is assumed that the global 'param_list' has been populated with
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* argument/return mval*.
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*/
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rhdtyp *make_cimode(void)
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{
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static rhdtyp *base_address = NULL;
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lab_tabent *lbl;
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int *lnr;
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unsigned char *code;
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if (NULL != base_address)
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return base_address;
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base_address = (rhdtyp *)GTM_TEXT_ALLOC(SIZEOF(rhdtyp) + CODE_SIZE + SIZEOF(lab_tabent) + CODE_LINES * SIZEOF(int4));
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memset(base_address,0,SIZEOF(rhdtyp) + CODE_SIZE + SIZEOF(lab_tabent) + CODE_LINES * SIZEOF(int4));
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base_address->routine_name.len = STR_LIT_LEN(GTM_CIMOD);
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base_address->routine_name.addr = GTM_CIMOD;
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base_address->ptext_ptr = SIZEOF(rhdtyp);
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base_address->vartab_ptr =
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base_address->labtab_ptr = SIZEOF(rhdtyp) + CODE_SIZE; /* hdr + code */
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base_address->lnrtab_ptr = SIZEOF(rhdtyp) + CODE_SIZE + SIZEOF(lab_tabent);
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base_address->labtab_len = 1;
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base_address->lnrtab_len = CODE_LINES;
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code = (unsigned char *) base_address + base_address->ptext_ptr;
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*code++ = I386_INS_CALL_Jv;
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*((int4 *)code) = (int4)((unsigned char *)ci_restart - (code + SIZEOF(int4)));
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code += SIZEOF(int4);
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*code++ = I386_INS_CALL_Jv; /* a CALL to return control from M to ci_ret_code() which in turn returns to gtm_ci() */
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*((int4 *)code) = (int4)((unsigned char *)ci_ret_code - (code + SIZEOF(int4)));
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code += SIZEOF(int4);
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*code++ = I386_INS_JMP_Jv;
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*((int4 *)code) = (int4)((unsigned char *)opp_ret - (code + SIZEOF(int4)));
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code += SIZEOF(int4);
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lbl = (lab_tabent *)((int) base_address + base_address->labtab_ptr);
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lbl->lab_ln_ptr = base_address->lnrtab_ptr;
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lnr = (int *)((int)base_address + base_address->lnrtab_ptr);
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*lnr++ = base_address->ptext_ptr;
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*lnr++ = base_address->ptext_ptr;
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*lnr++ = base_address->ptext_ptr + 2 * CALL_SIZE;
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assert(code - ((unsigned char *)base_address + base_address->ptext_ptr) == CODE_SIZE);
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zlput_rname(base_address);
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inst_flush(base_address, SIZEOF(rhdtyp) + CODE_SIZE + SIZEOF(lab_tabent) + CODE_LINES * SIZEOF(int4));
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return base_address;
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}
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