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[/] [zipcpu/] [trunk/] [sim/] [cpp/] [zipelf.cpp] - Blame information for rev 209

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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) 2015-2017, 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.
//
// You should have received a copy of the GNU General Public License along
// with this program.  (It's in the $(ROOT)/doc directory.  Run make with no
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// 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) {
        fprintf(stderr,"    %-20s 0x%jx\n","e_type", (uintmax_t)ehdr.e_type);
        fprintf(stderr,"    %-20s 0x%jx\n","e_machine", (uintmax_t)ehdr.e_machine);
        fprintf(stderr,"    %-20s 0x%jx\n","e_version", (uintmax_t)ehdr.e_version);
        fprintf(stderr,"    %-20s 0x%jx\n","e_entry",(uintmax_t)ehdr.e_entry);
        fprintf(stderr,"    %-20s 0x%jx\n","e_phoff",(uintmax_t)ehdr.e_phoff);
        fprintf(stderr,"    %-20s 0x%jx\n","e_shoff",(uintmax_t)ehdr.e_shoff);
        fprintf(stderr,"    %-20s 0x%jx\n","e_flags",(uintmax_t)ehdr.e_flags);
        fprintf(stderr,"    %-20s 0x%jx\n","e_ehsize",(uintmax_t)ehdr.e_ehsize);
        fprintf(stderr,"    %-20s 0x%jx\n","e_phentsize", (uintmax_t)ehdr.e_phentsize);
        fprintf(stderr,"    %-20s 0x%jx\n","e_shentsize", (uintmax_t)ehdr.e_shentsize);
        fprintf(stderr,"\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) {
                fprintf(stderr, "    %-20s 0x%x\n", "p_type",   phdr.p_type);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_offset", phdr.p_offset);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_vaddr",  phdr.p_vaddr);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_paddr",  phdr.p_paddr);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_memsz",  phdr.p_memsz);
                fprintf(stderr, "    %-20s 0x%x [", "p_flags",  phdr.p_flags);
 
                if (phdr.p_flags & PF_X)        fprintf(stderr, " Execute");
                if (phdr.p_flags & PF_R)        fprintf(stderr, " Read");
                if (phdr.p_flags & PF_W)        fprintf(stderr, " Write");
                fprintf(stderr, "]\n");
                fprintf(stderr, "    %-20s 0x%jx\n", "p_align", phdr.p_align);
                }
 
                total_octets += phdr.p_filesz;
        }
 
        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++) {
                if (dbg) fprintf(stderr, "Working with &d[%d]\n", current_offset);
                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) {
                fprintf(stderr, "    %-20s 0x%jx\n", "p_offset", phdr.p_offset);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_vaddr",  phdr.p_vaddr);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_paddr",  phdr.p_paddr);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);
                fprintf(stderr, "    %-20s 0x%jx\n", "p_memsz",  phdr.p_memsz);
                fprintf(stderr, "    %-20s 0x%x [", "p_flags",  phdr.p_flags);
 
                if (phdr.p_flags & PF_X)        fprintf(stderr, " Execute");
                if (phdr.p_flags & PF_R)        fprintf(stderr, " Read");
                if (phdr.p_flags & PF_W)        fprintf(stderr, " Write");
                fprintf(stderr, "]\n");
 
                fprintf(stderr, "    %-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;
                r[i]->m_vaddr = phdr.p_vaddr;
 
                current_offset += phdr.p_filesz + 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", (unsigned long)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);
}
 

Line No.	Rev	Author	Line
1	207	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
2	204	dgisselq	`//`
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	207	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
14	204	dgisselq	`//`
15	207	dgisselq	`// Copyright (C) 2015-2017, Gisselquist Technology, LLC`
16	204	dgisselq	`//`
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	207	dgisselq	`// You should have received a copy of the GNU General Public License along`
28			`// with this program. (It's in the $(ROOT)/doc directory. Run make with no`
29			`// target there if the PDF file isn't present.) If not, see`
30			`// <http://www.gnu.org/licenses/> for a copy.`
31			`//`
32	204	dgisselq	`// License: GPL, v3, as defined and found on www.gnu.org,`
33			`// http://www.gnu.org/licenses/gpl.html`
34			`//`
35			`//`
36	207	dgisselq	`////////////////////////////////////////////////////////////////////////////////`
37	204	dgisselq	`//`
38			`//`
39
40			`#include <stdlib.h>`
41			`#include <stdio.h>`
42			`#include <stdint.h>`
43			`#include <unistd.h>`
44			`#include <sys/types.h>`
45			`#include <sys/stat.h>`
46			`#include <fcntl.h>`
47			`#include <libelf.h>`
48			`#include <assert.h>`
49			`#include <gelf.h>`
50			`#include <string.h>`
51
52			`#include "zipelf.h"`
53
54			`bool`
55			`iself(const char *fname)`
56			`{`
57			`FILE *fp;`
58			`bool ret = true;`
59			`fp = fopen(fname, "rb");`
60
61			`if (!fp) return false;`
62			`if (0x7f != fgetc(fp)) ret = false;`
63			`if ('E' != fgetc(fp)) ret = false;`
64			`if ('L' != fgetc(fp)) ret = false;`
65			`if ('F' != fgetc(fp)) ret = false;`
66			`fclose(fp);`
67			`return ret;`
68			`}`
69
70			`void elfread(const char fname, unsigned &entry, ELFSECTION *&sections)`
71			`{`
72			`Elf *e;`
73			`int fd, i;`
74			`size_t n;`
75			`char *id;`
76			`Elf_Kind ek;`
77			`GElf_Ehdr ehdr;`
78			`GElf_Phdr phdr;`
79			`const bool dbg = false;`
80
81			`if (elf_version(EV_CURRENT) == EV_NONE) {`
82			`fprintf(stderr, "ELF library initialization err, %s\n", elf_errmsg(-1));`
83			`perror("O/S Err:");`
84			`exit(EXIT_FAILURE);`
85			`} if ((fd = open(fname, O_RDONLY, 0)) < 0) {`
86			`fprintf(stderr, "Could not open %s\n", fname);`
87			`perror("O/S Err:");`
88			`exit(EXIT_FAILURE);`
89			`} if ((e = elf_begin(fd, ELF_C_READ, NULL))==NULL) {`
90			`fprintf(stderr, "Could not run elf_begin, %s\n", elf_errmsg(-1));`
91			`exit(EXIT_FAILURE);`
92			`}`
93
94			`ek = elf_kind(e);`
95			`if (ek == ELF_K_ELF) {`
96			`; // This is the kind of file we should expect`
97			`} else if (ek == ELF_K_AR) {`
98			`fprintf(stderr, "Cannot run an archive!\n");`
99			`exit(EXIT_FAILURE);`
100			`} else if (ek == ELF_K_NONE) {`
101			`;`
102			`} else {`
103			`fprintf(stderr, "Unexpected ELF file kind!\n");`
104			`exit(EXIT_FAILURE);`
105			`}`
106
107			`if (gelf_getehdr(e, &ehdr) == NULL) {`
108			`fprintf(stderr, "getehdr() failed: %s\n", elf_errmsg(-1));`
109			`exit(EXIT_FAILURE);`
110			`} if ((i=gelf_getclass(e)) == ELFCLASSNONE) {`
111			`fprintf(stderr, "getclass() failed: %s\n", elf_errmsg(-1));`
112			`exit(EXIT_FAILURE);`
113			`} if ((id = elf_getident(e, NULL)) == NULL) {`
114			`fprintf(stderr, "getident() failed: %s\n", elf_errmsg(-1));`
115			`exit(EXIT_FAILURE);`
116			`} if (i != ELFCLASS32) {`
117			`fprintf(stderr, "This is a 64-bit ELF file, ZipCPU ELF files are all 32-bit\n");`
118			`exit(EXIT_FAILURE);`
119			`}`
120
121			`if (dbg) {`
122	207	dgisselq	`fprintf(stderr," %-20s 0x%jx\n","e_type", (uintmax_t)ehdr.e_type);`
123			`fprintf(stderr," %-20s 0x%jx\n","e_machine", (uintmax_t)ehdr.e_machine);`
124			`fprintf(stderr," %-20s 0x%jx\n","e_version", (uintmax_t)ehdr.e_version);`
125			`fprintf(stderr," %-20s 0x%jx\n","e_entry",(uintmax_t)ehdr.e_entry);`
126			`fprintf(stderr," %-20s 0x%jx\n","e_phoff",(uintmax_t)ehdr.e_phoff);`
127			`fprintf(stderr," %-20s 0x%jx\n","e_shoff",(uintmax_t)ehdr.e_shoff);`
128			`fprintf(stderr," %-20s 0x%jx\n","e_flags",(uintmax_t)ehdr.e_flags);`
129			`fprintf(stderr," %-20s 0x%jx\n","e_ehsize",(uintmax_t)ehdr.e_ehsize);`
130			`fprintf(stderr," %-20s 0x%jx\n","e_phentsize", (uintmax_t)ehdr.e_phentsize);`
131			`fprintf(stderr," %-20s 0x%jx\n","e_shentsize", (uintmax_t)ehdr.e_shentsize);`
132			`fprintf(stderr,"\n");`
133	204	dgisselq	`}`
134
135
136			`// Check whether or not this is an ELF file for the ZipCPU ...`
137			`if (ehdr.e_machine != 0x0dad1) {`
138			`fprintf(stderr, "This is not a ZipCPU/8 ELF file\n");`
139			`exit(EXIT_FAILURE);`
140			`}`
141
142			`// Get our entry address`
143			`entry = ehdr.e_entry;`
144
145
146			`// Now, let's go look at the program header`
147			`if (elf_getphdrnum(e, &n) != 0) {`
148			`fprintf(stderr, "elf_getphdrnum() failed: %s\n", elf_errmsg(-1));`
149			`exit(EXIT_FAILURE);`
150			`}`
151
152			`assert(n != 0);`
153
154			`unsigned total_octets = 0, current_offset=0, current_section=0;`
155			`for(i=0; i<(int)n; i++) {`
156			`total_octets += sizeof(ELFSECTION *)+sizeof(ELFSECTION);`
157
158			`if (gelf_getphdr(e, i, &phdr) != &phdr) {`
159			`fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));`
160			`exit(EXIT_FAILURE);`
161			`}`
162
163			`if (dbg) {`
164	207	dgisselq	`fprintf(stderr, " %-20s 0x%x\n", "p_type", phdr.p_type);`
165			`fprintf(stderr, " %-20s 0x%jx\n", "p_offset", phdr.p_offset);`
166			`fprintf(stderr, " %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);`
167			`fprintf(stderr, " %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);`
168			`fprintf(stderr, " %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);`
169			`fprintf(stderr, " %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);`
170			`fprintf(stderr, " %-20s 0x%x [", "p_flags", phdr.p_flags);`
171	204	dgisselq
172	207	dgisselq	`if (phdr.p_flags & PF_X) fprintf(stderr, " Execute");`
173			`if (phdr.p_flags & PF_R) fprintf(stderr, " Read");`
174			`if (phdr.p_flags & PF_W) fprintf(stderr, " Write");`
175			`fprintf(stderr, "]\n");`
176			`fprintf(stderr, " %-20s 0x%jx\n", "p_align", phdr.p_align);`
177	204	dgisselq	`}`
178
179	207	dgisselq	`total_octets += phdr.p_filesz;`
180	204	dgisselq	`}`
181
182			`char d = (char )malloc(total_octets + sizeof(ELFSECTION)+sizeof(ELFSECTION *));`
183			`memset(d, 0, total_octets);`
184
185			`ELFSECTION r = sections = (ELFSECTION )d;`
186			`current_offset = (n+1)sizeof(ELFSECTION );`
187			`current_section = 0;`
188
189			`for(i=0; i<(int)n; i++) {`
190	207	dgisselq	`if (dbg) fprintf(stderr, "Working with &d[%d]\n", current_offset);`
191	204	dgisselq	`r[i] = (ELFSECTION *)(&d[current_offset]);`
192
193			`if (gelf_getphdr(e, i, &phdr) != &phdr) {`
194			`fprintf(stderr, "getphdr() failed: %s\n", elf_errmsg(-1));`
195			`exit(EXIT_FAILURE);`
196			`}`
197
198			`if (dbg) {`
199	207	dgisselq	`fprintf(stderr, " %-20s 0x%jx\n", "p_offset", phdr.p_offset);`
200			`fprintf(stderr, " %-20s 0x%jx\n", "p_vaddr", phdr.p_vaddr);`
201			`fprintf(stderr, " %-20s 0x%jx\n", "p_paddr", phdr.p_paddr);`
202			`fprintf(stderr, " %-20s 0x%jx\n", "p_filesz", phdr.p_filesz);`
203			`fprintf(stderr, " %-20s 0x%jx\n", "p_memsz", phdr.p_memsz);`
204			`fprintf(stderr, " %-20s 0x%x [", "p_flags", phdr.p_flags);`
205	204	dgisselq
206	207	dgisselq	`if (phdr.p_flags & PF_X) fprintf(stderr, " Execute");`
207			`if (phdr.p_flags & PF_R) fprintf(stderr, " Read");`
208			`if (phdr.p_flags & PF_W) fprintf(stderr, " Write");`
209			`fprintf(stderr, "]\n");`
210	204	dgisselq
211	207	dgisselq	`fprintf(stderr, " %-20s 0x%jx\n", "p_align", phdr.p_align);`
212	204	dgisselq	`}`
213
214			`current_section++;`
215
216			`r[i]->m_start = phdr.p_paddr;`
217			`r[i]->m_len = phdr.p_filesz;`
218	209	dgisselq	`r[i]->m_vaddr = phdr.p_vaddr;`
219	204	dgisselq
220	207	dgisselq	`current_offset += phdr.p_filesz + sizeof(ELFSECTION);`
221	204	dgisselq
222			`// Now, let's read in our section ...`
223			`if (lseek(fd, phdr.p_offset, SEEK_SET) < 0) {`
224	209	dgisselq	`fprintf(stderr, "Could not seek to file position %08lx\n", (unsigned long)phdr.p_offset);`
225	204	dgisselq	`perror("O/S Err:");`
226			`exit(EXIT_FAILURE);`
227			`} if (phdr.p_filesz > phdr.p_memsz)`
228			`phdr.p_filesz = 0;`
229			`if (read(fd, r[i]->m_data, phdr.p_filesz) != (int)phdr.p_filesz) {`
230			`fprintf(stderr, "Didnt read entire section\n");`
231			`perror("O/S Err:");`
232			`exit(EXIT_FAILURE);`
233			`}`
234
235			`/*`
236			`// Next, we need to byte swap it from big to little endian`
237			`for(unsigned j=0; j<r[i]->m_len; j++)`
238			`r[i]->m_data[j] = byteswap(r[i]->m_data[j]);`
239			`*/`
240
241			`if (dbg) for(unsigned j=0; j<r[i]->m_len; j++)`
242			`fprintf(stderr, "ADR[%04x] = %02x\n", r[i]->m_start+j,`
243			`r[i]->m_data[j] & 0x0ff);`
244			`}`
245
246			`r[i] = (ELFSECTION *)(&d[current_offset]);`
247			`r[current_section]->m_start = 0;`
248			`r[current_section]->m_len = 0;`
249
250			`elf_end(e);`
251			`close(fd);`
252			`}`
253

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