92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2012 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 "i386.h"
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#include "urx.h"
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#include "rtnhdr.h"
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#include "op.h"
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#include "auto_zlink.h"
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#define PEA_SZ 5
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#define XFER_BYTE_SZ 3
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#define XFER_LONG_SZ 6
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#define INST_SZ 1
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error_def(ERR_LABELUNKNOWN);
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error_def(ERR_ROUTINEUNKNOWN);
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rhdtyp *auto_zlink (unsigned char *pc, int4 **line)
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{
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char *adj_pc; /* address of PEA rtnref offset */
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mstr rname;
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mident_fixed rname_local;
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urx_rtnref *rtnurx;
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mval rtn;
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rhdtyp *rhead;
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union
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{
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ModR_M modrm;
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unsigned char byte;
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} modrm_byte_byte, modrm_byte_long;
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/* ASSUMPTION -- The instruction previous to the current mpc is a transfer table jump.
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* This is either a byte or a int4 displacement off of ebx, instruction
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* size either 3 or 6 (prefix byte, ModR/M byte, 8- or 32-bit offset).
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*/
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modrm_byte_byte.modrm.reg_opcode = I386_INS_CALL_Ev;
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modrm_byte_byte.modrm.mod = I386_MOD32_BASE_DISP_8;
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modrm_byte_byte.modrm.r_m = I386_REG_EBX;
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modrm_byte_long.modrm.reg_opcode = I386_INS_CALL_Ev;
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modrm_byte_long.modrm.mod = I386_MOD32_BASE_DISP_32;
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modrm_byte_long.modrm.r_m = I386_REG_EBX;
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if ((*(pc - XFER_BYTE_SZ) == I386_INS_Grp5_Prefix) && (*(pc - XFER_BYTE_SZ + 1) == modrm_byte_byte.byte))
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{
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assert(*(pc - XFER_BYTE_SZ - PEA_SZ) == I386_INS_PUSH_Iv);
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adj_pc = (char *)pc - XFER_BYTE_SZ - PEA_SZ;
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} else if ((*(pc - XFER_LONG_SZ) == I386_INS_Grp5_Prefix) && (*(pc - XFER_LONG_SZ + 1) == modrm_byte_long.byte))
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{
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assert(*(pc - XFER_LONG_SZ - PEA_SZ) == I386_INS_PUSH_Iv);
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adj_pc = (char *)pc - XFER_LONG_SZ - PEA_SZ;
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} else
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GTMASSERT;
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if (azl_geturxrtn(adj_pc + INST_SZ, &rname, &rtnurx))
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{
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assert((0 <= rname.len) && (MAX_MIDENT_LEN >= rname.len));
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assert(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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* freed during op_zlink and before the call to find_rtn_hdr.
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*/
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memcpy(rname_local.c, rname.addr, rname.len);
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rname.addr = rname_local.c;
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assert(rtnurx);
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assert(*(adj_pc - PEA_SZ) == I386_INS_PUSH_Iv);
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assert(azl_geturxlab(adj_pc - PEA_SZ + INST_SZ, rtnurx));
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assert(!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))) /* note the assignment */
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{
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*line = *(int4 **)(adj_pc - PEA_SZ + INST_SZ);
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if (!(*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;
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}
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