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[/] [zipcpu/] [trunk/] [sim/] [cpp/] [zipelf.cpp] - Blame information for rev 204

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///////////////////////////////////////////////////////////////////////////////
//
// Filename:    zipelf.cpp
//
// Project:     Zip CPU -- a small, lightweight, RISC CPU soft core
//
// Purpose:     
//
//
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//
//
///////////////////////////////////////////////////////////////////////////////
//
//
 
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <libelf.h>
#include <assert.h>
#include <gelf.h>
#include <string.h>
 
#include "zipelf.h"
 
bool
iself(const char *fname)
{
        FILE    *fp;
        bool    ret = true;
        fp = fopen(fname, "rb");
 
        if (!fp)        return false;
        if (0x7f != fgetc(fp))  ret = false;
        if ('E'  != fgetc(fp))  ret = false;
        if ('L'  != fgetc(fp))  ret = false;
        if ('F'  != fgetc(fp))  ret = false;
        fclose(fp);
        return  ret;
}
 
void    elfread(const char *fname, unsigned &entry, ELFSECTION **&sections)
{
        Elf     *e;
        int     fd, i;
        size_t  n;
        char    *id;
        Elf_Kind        ek;
        GElf_Ehdr       ehdr;
        GElf_Phdr       phdr;
        const   bool    dbg = false;
 
        if (elf_version(EV_CURRENT) == EV_NONE) {
                fprintf(stderr, "ELF library initialization err, %s\n", elf_errmsg(-1));
                perror("O/S Err:");
                exit(EXIT_FAILURE);
        } if ((fd = open(fname, O_RDONLY, 0)) < 0) {
                fprintf(stderr, "Could not open %s\n", fname);
                perror("O/S Err:");
                exit(EXIT_FAILURE);
        } if ((e = elf_begin(fd, ELF_C_READ, NULL))==NULL) {
                fprintf(stderr, "Could not run elf_begin, %s\n", elf_errmsg(-1));
                exit(EXIT_FAILURE);
        }
 
        ek = elf_kind(e);
        if (ek == ELF_K_ELF) {
                ; // This is the kind of file we should expect
        } else if (ek == ELF_K_AR) {
                fprintf(stderr, "Cannot run an archive!\n");
                exit(EXIT_FAILURE);
        } else if (ek == ELF_K_NONE) {
                ;
        } else {
                fprintf(stderr, "Unexpected ELF file kind!\n");
                exit(EXIT_FAILURE);
        }
 
        if (gelf_getehdr(e, &ehdr) == NULL) {
                fprintf(stderr, "getehdr() failed: %s\n", elf_errmsg(-1));
                exit(EXIT_FAILURE);
        } if ((i=gelf_getclass(e)) == ELFCLASSNONE) {
                fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));
                exit(EXIT_FAILURE);
        } if ((id = elf_getident(e, NULL)) == NULL) {
                fprintf(stderr, "getident() failed: %s\n", elf_errmsg(-1));
                exit(EXIT_FAILURE);
        } if (i != ELFCLASS32) {
                fprintf(stderr, "This is a 64-bit ELF file, ZipCPU ELF files are all 32-bit\n");
                exit(EXIT_FAILURE);
        }
 
        if (dbg) {
        printf("    %-20s 0x%jx\n", "e_type", (uintmax_t)ehdr.e_type);
        printf("    %-20s 0x%jx\n", "e_machine", (uintmax_t)ehdr.e_machine);
        printf("    %-20s 0x%jx\n", "e_version", (uintmax_t)ehdr.e_version);
        printf("    %-20s 0x%jx\n", "e_entry", (uintmax_t)ehdr.e_entry);
        printf("    %-20s 0x%jx\n", "e_phoff", (uintmax_t)ehdr.e_phoff);
        printf("    %-20s 0x%jx\n", "e_shoff", (uintmax_t)ehdr.e_shoff);
        printf("    %-20s 0x%jx\n", "e_flags", (uintmax_t)ehdr.e_flags);
        printf("    %-20s 0x%jx\n", "e_ehsize", (uintmax_t)ehdr.e_ehsize);
        printf("    %-20s 0x%jx\n", "e_phentsize", (uintmax_t)ehdr.e_phentsize);
        printf("    %-20s 0x%jx\n", "e_shentsize", (uintmax_t)ehdr.e_shentsize);
        printf("\n");
        }
 
 
        // Check whether or not this is an ELF file for the ZipCPU ...
        if (ehdr.e_machine != 0x0dad1) {
                fprintf(stderr, "This is not a ZipCPU/8 ELF file\n");
                exit(EXIT_FAILURE);
        }
 
        // Get our entry address
        entry = ehdr.e_entry;
 
 
        // Now, let's go look at the program header
        if (elf_getphdrnum(e, &n) != 0) {
                fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));
                exit(EXIT_FAILURE);
        }
 
assert(n != 0);
 
        unsigned total_octets = 0, current_offset=0, current_section=0;
        for(i=0; i<(int)n; i++) {
                total_octets += sizeof(ELFSECTION *)+sizeof(ELFSECTION);
 
                if (gelf_getphdr(e, i, &phdr) != &phdr) {
                        fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
                        exit(EXIT_FAILURE);
                }
 
                if (dbg) {
                printf("    %-20s 0x%x\n", "p_type",   phdr.p_type);
                printf("    %-20s 0x%jx\n", "p_offset", phdr.p_offset);
                printf("    %-20s 0x%jx\n", "p_vaddr",  phdr.p_vaddr);
                printf("    %-20s 0x%jx\n", "p_paddr",  phdr.p_paddr);
                printf("    %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
                printf("    %-20s 0x%jx\n", "p_memsz",  phdr.p_memsz);
                printf("    %-20s 0x%x [", "p_flags",  phdr.p_flags);
 
                if (phdr.p_flags & PF_X)        printf(" Execute");
                if (phdr.p_flags & PF_R)        printf(" Read");
                if (phdr.p_flags & PF_W)        printf(" Write");
                printf("]\n");
                printf("    %-20s 0x%jx\n", "p_align", phdr.p_align);
                }
 
                total_octets += phdr.p_memsz;
        }
 
        char    *d = (char *)malloc(total_octets + sizeof(ELFSECTION)+sizeof(ELFSECTION *));
        memset(d, 0, total_octets);
 
        ELFSECTION **r = sections = (ELFSECTION **)d;
        current_offset = (n+1)*sizeof(ELFSECTION *);
        current_section = 0;
 
        for(i=0; i<(int)n; i++) {
                r[i] = (ELFSECTION *)(&d[current_offset]);
 
                if (gelf_getphdr(e, i, &phdr) != &phdr) {
                        fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));
                        exit(EXIT_FAILURE);
                }
 
                if (dbg) {
                printf("    %-20s 0x%jx\n", "p_offset", phdr.p_offset);
                printf("    %-20s 0x%jx\n", "p_vaddr",  phdr.p_vaddr);
                printf("    %-20s 0x%jx\n", "p_paddr",  phdr.p_paddr);
                printf("    %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
                printf("    %-20s 0x%jx\n", "p_memsz",  phdr.p_memsz);
                printf("    %-20s 0x%x [", "p_flags",  phdr.p_flags);
 
                if (phdr.p_flags & PF_X)        printf(" Execute");
                if (phdr.p_flags & PF_R)        printf(" Read");
                if (phdr.p_flags & PF_W)        printf(" Write");
                printf("]\n");
 
                printf("    %-20s 0x%jx\n", "p_align", phdr.p_align);
                }
 
                current_section++;
 
                r[i]->m_start = phdr.p_paddr;
                r[i]->m_len   = phdr.p_filesz;
 
                current_offset += phdr.p_memsz + sizeof(ELFSECTION);
 
                // Now, let's read in our section ...
                if (lseek(fd, phdr.p_offset, SEEK_SET) < 0) {
                        fprintf(stderr, "Could not seek to file position %08lx\n", phdr.p_offset);
                        perror("O/S Err:");
                        exit(EXIT_FAILURE);
                } if (phdr.p_filesz > phdr.p_memsz)
                        phdr.p_filesz = 0;
                if (read(fd, r[i]->m_data, phdr.p_filesz) != (int)phdr.p_filesz) {
                        fprintf(stderr, "Didnt read entire section\n");
                        perror("O/S Err:");
                        exit(EXIT_FAILURE);
                }
 
                /*
                // Next, we need to byte swap it from big to little endian
                for(unsigned j=0; j<r[i]->m_len; j++)
                        r[i]->m_data[j] = byteswap(r[i]->m_data[j]);
                */
 
                if (dbg) for(unsigned j=0; j<r[i]->m_len; j++)
                        fprintf(stderr, "ADR[%04x] = %02x\n", r[i]->m_start+j,
                                r[i]->m_data[j] & 0x0ff);
        }
 
        r[i] = (ELFSECTION *)(&d[current_offset]);
        r[current_section]->m_start = 0;
        r[current_section]->m_len   = 0;
 
        elf_end(e);
        close(fd);
}
 

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[/] [zipcpu/] [trunk/] [sim/] [cpp/] [zipelf.cpp] - Blame information for rev 204

Line No.	Rev	Author	Line
1	204	dgisselq	`///////////////////////////////////////////////////////////////////////////////`
2			`//`
3			`// Filename: zipelf.cpp`
4			`//`
5			`// Project: Zip CPU -- a small, lightweight, RISC CPU soft core`
6			`//`
7			`// Purpose:`
8			`//`
9			`//`
10			`// Creator: Dan Gisselquist, Ph.D.`
11			`// Gisselquist Technology, LLC`
12			`//`
13			`///////////////////////////////////////////////////////////////////////////////`
14			`//`
15			`// Copyright (C) 2015-2016, Gisselquist Technology, LLC`
16			`//`
17			`// This program is free software (firmware): you can redistribute it and/or`
18			`// modify it under the terms of the GNU General Public License as published`
19			`// by the Free Software Foundation, either version 3 of the License, or (at`
20			`// your option) any later version.`
21			`//`
22			`// This program is distributed in the hope that it will be useful, but WITHOUT`
23			`// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or`
24			`// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
25			`// for more details.`
26			`//`
27			`// License: GPL, v3, as defined and found on www.gnu.org,`
28			`// http://www.gnu.org/licenses/gpl.html`
29			`//`
30			`//`
31			`///////////////////////////////////////////////////////////////////////////////`
32			`//`
33			`//`
34
35			`#include <stdlib.h>`
36			`#include <stdio.h>`
37			`#include <stdint.h>`
38			`#include <unistd.h>`
39			`#include <sys/types.h>`
40			`#include <sys/stat.h>`
41			`#include <fcntl.h>`
42			`#include <libelf.h>`
43			`#include <assert.h>`
44			`#include <gelf.h>`
45			`#include <string.h>`
46
47			`#include "zipelf.h"`
48
49			`bool`
50			`iself(const char *fname)`
51			`{`
52			`FILE *fp;`
53			`bool ret = true;`
54			`fp = fopen(fname, "rb");`
55
56			`if (!fp) return false;`
57			`if (0x7f != fgetc(fp)) ret = false;`
58			`if ('E' != fgetc(fp)) ret = false;`
59			`if ('L' != fgetc(fp)) ret = false;`
60			`if ('F' != fgetc(fp)) ret = false;`
61			`fclose(fp);`
62			`return ret;`
63			`}`
64
65			`void elfread(const char fname, unsigned &entry, ELFSECTION *&sections)`
66			`{`
67			`Elf *e;`
68			`int fd, i;`
69			`size_t n;`
70			`char *id;`
71			`Elf_Kind ek;`
72			`GElf_Ehdr ehdr;`
73			`GElf_Phdr phdr;`
74			`const bool dbg = false;`
75
76			`if (elf_version(EV_CURRENT) == EV_NONE) {`
77			`fprintf(stderr, "ELF library initialization err, %s\n", elf_errmsg(-1));`
78			`perror("O/S Err:");`
79			`exit(EXIT_FAILURE);`
80			`} if ((fd = open(fname, O_RDONLY, 0)) < 0) {`
81			`fprintf(stderr, "Could not open %s\n", fname);`
82			`perror("O/S Err:");`
83			`exit(EXIT_FAILURE);`
84			`} if ((e = elf_begin(fd, ELF_C_READ, NULL))==NULL) {`
85			`fprintf(stderr, "Could not run elf_begin, %s\n", elf_errmsg(-1));`
86			`exit(EXIT_FAILURE);`
87			`}`
88
89			`ek = elf_kind(e);`
90			`if (ek == ELF_K_ELF) {`
91			`; // This is the kind of file we should expect`
92			`} else if (ek == ELF_K_AR) {`
93			`fprintf(stderr, "Cannot run an archive!\n");`
94			`exit(EXIT_FAILURE);`
95			`} else if (ek == ELF_K_NONE) {`
96			`;`
97			`} else {`
98			`fprintf(stderr, "Unexpected ELF file kind!\n");`
99			`exit(EXIT_FAILURE);`
100			`}`
101
102			`if (gelf_getehdr(e, &ehdr) == NULL) {`
103			`fprintf(stderr, "getehdr() failed: %s\n", elf_errmsg(-1));`
104			`exit(EXIT_FAILURE);`
105			`} if ((i=gelf_getclass(e)) == ELFCLASSNONE) {`
106			`fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));`
107			`exit(EXIT_FAILURE);`
108			`} if ((id = elf_getident(e, NULL)) == NULL) {`
109			`fprintf(stderr, "getident() failed: %s\n", elf_errmsg(-1));`
110			`exit(EXIT_FAILURE);`
111			`} if (i != ELFCLASS32) {`
112			`fprintf(stderr, "This is a 64-bit ELF file, ZipCPU ELF files are all 32-bit\n");`
113			`exit(EXIT_FAILURE);`
114			`}`
115
116			`if (dbg) {`
117			`printf(" %-20s 0x%jx\n", "e_type", (uintmax_t)ehdr.e_type);`
118			`printf(" %-20s 0x%jx\n", "e_machine", (uintmax_t)ehdr.e_machine);`
119			`printf(" %-20s 0x%jx\n", "e_version", (uintmax_t)ehdr.e_version);`
120			`printf(" %-20s 0x%jx\n", "e_entry", (uintmax_t)ehdr.e_entry);`
121			`printf(" %-20s 0x%jx\n", "e_phoff", (uintmax_t)ehdr.e_phoff);`
122			`printf(" %-20s 0x%jx\n", "e_shoff", (uintmax_t)ehdr.e_shoff);`
123			`printf(" %-20s 0x%jx\n", "e_flags", (uintmax_t)ehdr.e_flags);`
124			`printf(" %-20s 0x%jx\n", "e_ehsize", (uintmax_t)ehdr.e_ehsize);`
125			`printf(" %-20s 0x%jx\n", "e_phentsize", (uintmax_t)ehdr.e_phentsize);`
126			`printf(" %-20s 0x%jx\n", "e_shentsize", (uintmax_t)ehdr.e_shentsize);`
127			`printf("\n");`
128			`}`
129
130
131			`// Check whether or not this is an ELF file for the ZipCPU ...`
132			`if (ehdr.e_machine != 0x0dad1) {`
133			`fprintf(stderr, "This is not a ZipCPU/8 ELF file\n");`
134			`exit(EXIT_FAILURE);`
135			`}`
136
137			`// Get our entry address`
138			`entry = ehdr.e_entry;`
139
140
141			`// Now, let's go look at the program header`
142			`if (elf_getphdrnum(e, &n) != 0) {`
143			`fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));`
144			`exit(EXIT_FAILURE);`
145			`}`
146
147			`assert(n != 0);`
148
149			`unsigned total_octets = 0, current_offset=0, current_section=0;`
150			`for(i=0; i<(int)n; i++) {`
151			`total_octets += sizeof(ELFSECTION *)+sizeof(ELFSECTION);`
152
153			`if (gelf_getphdr(e, i, &phdr) != &phdr) {`
154			`fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));`
155			`exit(EXIT_FAILURE);`
156			`}`
157
158			`if (dbg) {`
159			`printf(" %-20s 0x%x\n", "p_type", phdr.p_type);`
160			`printf(" %-20s 0x%jx\n", "p_offset", phdr.p_offset);`
161			`printf(" %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);`
162			`printf(" %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);`
163			`printf(" %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);`
164			`printf(" %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);`
165			`printf(" %-20s 0x%x [", "p_flags", phdr.p_flags);`
166
167			`if (phdr.p_flags & PF_X) printf(" Execute");`
168			`if (phdr.p_flags & PF_R) printf(" Read");`
169			`if (phdr.p_flags & PF_W) printf(" Write");`
170			`printf("]\n");`
171			`printf(" %-20s 0x%jx\n", "p_align", phdr.p_align);`
172			`}`
173
174			`total_octets += phdr.p_memsz;`
175			`}`
176
177			`char d = (char )malloc(total_octets + sizeof(ELFSECTION)+sizeof(ELFSECTION *));`
178			`memset(d, 0, total_octets);`
179
180			`ELFSECTION r = sections = (ELFSECTION )d;`
181			`current_offset = (n+1)sizeof(ELFSECTION );`
182			`current_section = 0;`
183
184			`for(i=0; i<(int)n; i++) {`
185			`r[i] = (ELFSECTION *)(&d[current_offset]);`
186
187			`if (gelf_getphdr(e, i, &phdr) != &phdr) {`
188			`fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));`
189			`exit(EXIT_FAILURE);`
190			`}`
191
192			`if (dbg) {`
193			`printf(" %-20s 0x%jx\n", "p_offset", phdr.p_offset);`
194			`printf(" %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);`
195			`printf(" %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);`
196			`printf(" %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);`
197			`printf(" %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);`
198			`printf(" %-20s 0x%x [", "p_flags", phdr.p_flags);`
199
200			`if (phdr.p_flags & PF_X) printf(" Execute");`
201			`if (phdr.p_flags & PF_R) printf(" Read");`
202			`if (phdr.p_flags & PF_W) printf(" Write");`
203			`printf("]\n");`
204
205			`printf(" %-20s 0x%jx\n", "p_align", phdr.p_align);`
206			`}`
207
208			`current_section++;`
209
210			`r[i]->m_start = phdr.p_paddr;`
211			`r[i]->m_len = phdr.p_filesz;`
212
213			`current_offset += phdr.p_memsz + sizeof(ELFSECTION);`
214
215			`// Now, let's read in our section ...`
216			`if (lseek(fd, phdr.p_offset, SEEK_SET) < 0) {`
217			`fprintf(stderr, "Could not seek to file position %08lx\n", phdr.p_offset);`
218			`perror("O/S Err:");`
219			`exit(EXIT_FAILURE);`
220			`} if (phdr.p_filesz > phdr.p_memsz)`
221			`phdr.p_filesz = 0;`
222			`if (read(fd, r[i]->m_data, phdr.p_filesz) != (int)phdr.p_filesz) {`
223			`fprintf(stderr, "Didnt read entire section\n");`
224			`perror("O/S Err:");`
225			`exit(EXIT_FAILURE);`
226			`}`
227
228			`/*`
229			`// Next, we need to byte swap it from big to little endian`
230			`for(unsigned j=0; j<r[i]->m_len; j++)`
231			`r[i]->m_data[j] = byteswap(r[i]->m_data[j]);`
232			`*/`
233
234			`if (dbg) for(unsigned j=0; j<r[i]->m_len; j++)`
235			`fprintf(stderr, "ADR[%04x] = %02x\n", r[i]->m_start+j,`
236			`r[i]->m_data[j] & 0x0ff);`
237			`}`
238
239			`r[i] = (ELFSECTION *)(&d[current_offset]);`
240			`r[current_section]->m_start = 0;`
241			`r[current_section]->m_len = 0;`
242
243			`elf_end(e);`
244			`close(fd);`
245			`}`
246