86 lines
2.6 KiB
C
86 lines
2.6 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 "xfer_enum.h"
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#include "i386.h"
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#include "rtnhdr.h" /* Needed by zbreak.h */
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#include "zbreak.h"
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zb_code *find_line_call(void *addr)
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{
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unsigned char *call_addr;
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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;
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call_addr = (unsigned char *)addr;
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modrm_byte.byte = *(call_addr + 1);
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if ((I386_INS_Grp5_Prefix == *call_addr) && (I386_INS_CALL_Ev == modrm_byte.modrm.reg_opcode))
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{
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call_addr++;
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assert(I386_REG_EBX == modrm_byte.modrm.r_m);
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call_addr++;
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if (I386_MOD32_BASE_DISP_8 == modrm_byte.modrm.mod)
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{
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if ((xf_linestart * SIZEOF(int4) == *call_addr) ||
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(xf_zbstart * SIZEOF(int4) == *call_addr))
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return (zb_code *)call_addr;
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call_addr++;
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} else
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{
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assert (I386_MOD32_BASE_DISP_32 == modrm_byte.modrm.mod);
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return (zb_code *)addr;
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}
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}
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modrm_byte.byte = *(call_addr + 1);
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if ((I386_INS_PUSH_Ib == *call_addr) || (I386_INS_PUSH_Iv == *call_addr))
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{
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while ((I386_INS_PUSH_Ib == *call_addr) || (I386_INS_PUSH_Iv == *call_addr))
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{
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if (I386_INS_PUSH_Ib == *call_addr)
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call_addr += 1 + SIZEOF(unsigned char);
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else
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{
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assert(I386_INS_PUSH_Iv == *call_addr);
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call_addr += 1 + SIZEOF(int4);
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}
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}
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modrm_byte.byte = *(call_addr + 1);
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if ((I386_INS_Grp5_Prefix != *call_addr++) || (I386_INS_CALL_Ev != modrm_byte.modrm.reg_opcode))
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return (zb_code *)addr;
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assert((I386_MOD32_BASE_DISP_8 == modrm_byte.modrm.mod) || (I386_MOD32_BASE_DISP_32 == modrm_byte.modrm.mod));
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assert(I386_REG_EBX == modrm_byte.modrm.r_m);
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call_addr++;
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if (I386_MOD32_BASE_DISP_8 == modrm_byte.modrm.mod)
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{
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if ((xf_linefetch * SIZEOF(int4) != *call_addr) && (xf_zbfetch * SIZEOF(int4) != *call_addr))
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return (zb_code *)addr;
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}
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}
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else if ((I386_INS_Grp5_Prefix == *call_addr) && (I386_INS_CALL_Ev != modrm_byte.modrm.reg_opcode))
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{
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call_addr++;
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assert((I386_MOD32_BASE_DISP_8 == modrm_byte.modrm.mod) || (I386_MOD32_BASE_DISP_32 == modrm_byte.modrm.mod));
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assert(I386_REG_EBX == modrm_byte.modrm.r_m);
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call_addr++;
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if (I386_MOD32_BASE_DISP_8 == modrm_byte.modrm.mod)
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{
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if ((xf_linestart * SIZEOF(int4) != *call_addr) && (xf_zbstart * SIZEOF(int4) != *call_addr))
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return (zb_code *)addr;
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}
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}
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return (zb_code *)call_addr;
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}
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