2c25c3e944
WHAT'S NEW with version 0.0.2:
- Again thanks to Eric Youngdale for some very useful comments.
- The Windows startup code created by Micrsoft C 7.0 now runs
to completion.
- Added a new patch to the kernel to increase the usable size of
the ldt to the full 32 entries currently allowed.
- Imported name relocations are now supported.
- Source code for my infamous test program is now included.
- A handful of basic Windows functions are now emulated. See
"kernel.spec" for examples of how to use the build program.
WHAT'S NEW with version 0.0.1:
- Eric Youngdale contributed countless improvements in memory
efficiency, bug fixes, and relocation.
- The build program has been completed. It now lets you specify
how the main DLL entry point should interface to your emulation
library routines. A brief description of how to build these
specifications is included in the file "build-spec.txt".
- The code to dispatch builtin DLL calls is complete, but untested.
264 lines
6.4 KiB
C
264 lines
6.4 KiB
C
/* $Id: exedump.c,v 1.1 1993/06/09 03:28:10 root Exp root $
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*/
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/*
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* Copyright Robert J. Amstadt, 1993
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <linux/unistd.h>
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#include <linux/head.h>
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#include <linux/mman.h>
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#include <linux/a.out.h>
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#include <linux/ldt.h>
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#include <errno.h>
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#include "neexe.h"
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#include "segmem.h"
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#include "prototypes.h"
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struct segment_descriptor_s *SelectorTable;
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int SelectorTableLength;
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int EnvironmentSelectorIdx;
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int PSPSelectorIdx;
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unsigned short PSPSelector;
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extern void KERNEL_Ordinal_102();
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extern void UNIXLIB_Ordinal_0();
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/**********************************************************************
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* GetDOSEnvironment
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*/
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void *
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GetDOSEnvironment()
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{
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return SelectorTable[EnvironmentSelectorIdx].base_addr;
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}
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/**********************************************************************
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* CreateEnvironment
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*/
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void
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CreateEnvironment(int sel_idx, struct segment_descriptor_s *s, FILE *zfile)
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{
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char *p;
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EnvironmentSelectorIdx = sel_idx;
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/*
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* Create memory to hold environment.
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*/
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s->flags = NE_SEGFLAGS_DATA;
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s->selector = (sel_idx << 3) | 0x0007;
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s->length = PAGE_SIZE;
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s->base_addr = (void *) mmap((char *) (s->selector << 16),
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PAGE_SIZE,
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PROT_EXEC | PROT_READ | PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE, fileno(zfile), 0);
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/*
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* Fill environment with meaningless babble.
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*/
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p = (char *) s->base_addr;
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strcpy(p, "PATH=C:\\WINDOWS");
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p += strlen(p) + 1;
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*p++ = '\0';
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*p++ = 11;
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*p++ = 0;
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strcpy(p, "C:\\TEST.EXE");
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/*
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* Create entry in LDT for this segment.
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*/
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if (set_ldt_entry(sel_idx, (unsigned long) s->base_addr, s->length, 0,
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MODIFY_LDT_CONTENTS_DATA, 0, 0) < 0)
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{
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myerror("Could not create LDT entry for environment");
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}
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}
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/**********************************************************************
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* CreatePSP
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*/
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void
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CreatePSP(int sel_idx, struct segment_descriptor_s *s, FILE *zfile)
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{
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struct dos_psp_s *psp;
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unsigned short *usp;
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PSPSelectorIdx = sel_idx;
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/*
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* Create memory to hold PSP.
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*/
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s->flags = NE_SEGFLAGS_DATA;
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s->selector = (sel_idx << 3) | 0x0007;
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s->length = PAGE_SIZE;
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s->base_addr = (void *) mmap((char *) (s->selector << 16),
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PAGE_SIZE,
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PROT_EXEC | PROT_READ | PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE, fileno(zfile), 0);
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/*
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* Fill PSP
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*/
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PSPSelector = s->selector;
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psp = (struct dos_psp_s *) s->base_addr;
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psp->pspInt20 = 0x20cd;
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psp->pspDispatcher[0] = 0x9a;
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usp = (unsigned short *) &psp->pspDispatcher[1];
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*usp = (unsigned short) KERNEL_Ordinal_102;
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*(usp + 1) = 0x23;
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psp->pspTerminateVector = 0x00230000 | ((int) UNIXLIB_Ordinal_0 & 0xffff);
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psp->pspControlCVector = 0x00230000 | ((int) UNIXLIB_Ordinal_0 & 0xffff);
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psp->pspCritErrorVector = 0x00230000 | ((int) UNIXLIB_Ordinal_0 & 0xffff);
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psp->pspEnvironment = SelectorTable[EnvironmentSelectorIdx].selector;
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psp->pspCommandTailCount = 1;
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strcpy(psp->pspCommandTail, "\r");
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/*
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* Create entry in LDT for this segment.
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*/
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if (set_ldt_entry(sel_idx, (unsigned long) s->base_addr, s->length, 0,
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MODIFY_LDT_CONTENTS_DATA, 0, 0) < 0)
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{
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myerror("Could not create LDT entry for PSP");
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}
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}
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/**********************************************************************
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* CreateSelectors
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*/
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struct segment_descriptor_s *
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CreateSelectors(int fd, struct ne_segment_table_entry_s *seg_table,
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struct ne_header_s *ne_header)
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{
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struct segment_descriptor_s *selectors, *s;
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int contents, read_only;
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int i;
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int status;
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FILE * zfile;
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int old_length;
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/*
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* Allocate memory for the table to keep track of all selectors.
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*/
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SelectorTableLength = ne_header->n_segment_tab + 2;
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selectors = malloc(SelectorTableLength * sizeof(*selectors));
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if (selectors == NULL)
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return NULL;
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SelectorTable = selectors;
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/*
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* Step through the segment table in the exe header.
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*/
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s = selectors;
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zfile = fopen("/dev/zero","r");
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for (i = 0; i < ne_header->n_segment_tab; i++, s++)
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{
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/*
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* Store the flags in our table.
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*/
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s->flags = seg_table[i].seg_flags;
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s->selector = (i << 3) | 0x0007;
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/*
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* Is there an image for this segment in the file?
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*/
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if (seg_table[i].seg_data_offset == 0)
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{
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/*
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* No image in exe file, let's allocate some memory for it.
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*/
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s->length = seg_table[i].min_alloc;
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}
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else
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{
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/*
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* Image in file, let's just point to the image in memory.
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*/
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s->length = seg_table[i].seg_data_length;
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}
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if (s->length == 0)
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s->length = 0x10000;
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old_length = s->length;
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/*
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* If this is the automatic data segment, its size must be adjusted.
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* First we need to check for local heap. Second we nee to see if
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* this is also the stack segment.
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*/
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if (i + 1 == ne_header->auto_data_seg)
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{
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s->length += ne_header->local_heap_length;
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if (i + 1 == ne_header->ss)
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{
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s->length += ne_header->stack_length;
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ne_header->sp = s->length;
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}
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}
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/*
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* Is this a DATA or CODE segment?
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*/
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read_only = 0;
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if (s->flags & NE_SEGFLAGS_DATA)
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{
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contents = MODIFY_LDT_CONTENTS_DATA;
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if (s->flags & NE_SEGFLAGS_READONLY)
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read_only = 1;
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}
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else
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{
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contents = MODIFY_LDT_CONTENTS_CODE;
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if (s->flags & NE_SEGFLAGS_EXECUTEONLY)
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read_only = 1;
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}
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s->base_addr =
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(void *) mmap((char *) (s->selector << 16),
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(s->length + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1),
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PROT_EXEC | PROT_READ | PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE, fileno(zfile), 0);
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if (seg_table[i].seg_data_offset != 0)
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{
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/*
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* Image in file.
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*/
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status = lseek(fd, seg_table[i].seg_data_offset * 512, SEEK_SET);
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if(read(fd, s->base_addr, old_length) != old_length)
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myerror("Unable to read segment from file");
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}
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/*
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* Create entry in LDT for this segment.
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*/
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if (set_ldt_entry(i, (unsigned long) s->base_addr, s->length, 0,
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contents, read_only, 0) < 0)
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{
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free(selectors);
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return NULL;
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}
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/*
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* If this is the automatic data segment, then we must initialize
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* the local heap.
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*/
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if (i + 1 == ne_header->auto_data_seg)
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{
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HEAP_LocalInit(s->base_addr + old_length,
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ne_header->local_heap_length);
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}
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}
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CreateEnvironment(i++, s++, zfile);
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CreatePSP(i++, s++, zfile);
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fclose(zfile);
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return selectors;
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}
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