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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [powerpc/] [kernel/] [module_32.c] - Blame information for rev 17

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/*  Kernel module help for PPC.
    Copyright (C) 2001 Rusty Russell.
 
    This program is free software; 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 2 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
    MERCHANTABILITY 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; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#include <linux/module.h>
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/cache.h>
#include <linux/bug.h>
 
#include "setup.h"
 
#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt , ...)
#endif
 
LIST_HEAD(module_bug_list);
 
void *module_alloc(unsigned long size)
{
        if (size == 0)
                return NULL;
        return vmalloc(size);
}
 
/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
        vfree(module_region);
        /* FIXME: If module_region == mod->init_region, trim exception
           table entries. */
}
 
/* Count how many different relocations (different symbol, different
   addend) */
static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num)
{
        unsigned int i, j, ret = 0;
 
        /* Sure, this is order(n^2), but it's usually short, and not
           time critical */
        for (i = 0; i < num; i++) {
                for (j = 0; j < i; j++) {
                        /* If this addend appeared before, it's
                           already been counted */
                        if (ELF32_R_SYM(rela[i].r_info)
                            == ELF32_R_SYM(rela[j].r_info)
                            && rela[i].r_addend == rela[j].r_addend)
                                break;
                }
                if (j == i) ret++;
        }
        return ret;
}
 
/* Get the potential trampolines size required of the init and
   non-init sections */
static unsigned long get_plt_size(const Elf32_Ehdr *hdr,
                                  const Elf32_Shdr *sechdrs,
                                  const char *secstrings,
                                  int is_init)
{
        unsigned long ret = 0;
        unsigned i;
 
        /* Everything marked ALLOC (this includes the exported
           symbols) */
        for (i = 1; i < hdr->e_shnum; i++) {
                /* If it's called *.init*, and we're not init, we're
                   not interested */
                if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)
                    != is_init)
                        continue;
 
                /* We don't want to look at debug sections. */
                if (strstr(secstrings + sechdrs[i].sh_name, ".debug") != 0)
                        continue;
 
                if (sechdrs[i].sh_type == SHT_RELA) {
                        DEBUGP("Found relocations in section %u\n", i);
                        DEBUGP("Ptr: %p.  Number: %u\n",
                               (void *)hdr + sechdrs[i].sh_offset,
                               sechdrs[i].sh_size / sizeof(Elf32_Rela));
                        ret += count_relocs((void *)hdr
                                             + sechdrs[i].sh_offset,
                                             sechdrs[i].sh_size
                                             / sizeof(Elf32_Rela))
                                * sizeof(struct ppc_plt_entry);
                }
        }
 
        return ret;
}
 
int module_frob_arch_sections(Elf32_Ehdr *hdr,
                              Elf32_Shdr *sechdrs,
                              char *secstrings,
                              struct module *me)
{
        unsigned int i;
 
        /* Find .plt and .init.plt sections */
        for (i = 0; i < hdr->e_shnum; i++) {
                if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0)
                        me->arch.init_plt_section = i;
                else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0)
                        me->arch.core_plt_section = i;
        }
        if (!me->arch.core_plt_section || !me->arch.init_plt_section) {
                printk("Module doesn't contain .plt or .init.plt sections.\n");
                return -ENOEXEC;
        }
 
        /* Override their sizes */
        sechdrs[me->arch.core_plt_section].sh_size
                = get_plt_size(hdr, sechdrs, secstrings, 0);
        sechdrs[me->arch.init_plt_section].sh_size
                = get_plt_size(hdr, sechdrs, secstrings, 1);
        return 0;
}
 
int apply_relocate(Elf32_Shdr *sechdrs,
                   const char *strtab,
                   unsigned int symindex,
                   unsigned int relsec,
                   struct module *module)
{
        printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n",
               module->name);
        return -ENOEXEC;
}
 
static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val)
{
        if (entry->jump[0] == 0x3d600000 + ((val + 0x8000) >> 16)
            && entry->jump[1] == 0x396b0000 + (val & 0xffff))
                return 1;
        return 0;
}
 
/* Set up a trampoline in the PLT to bounce us to the distant function */
static uint32_t do_plt_call(void *location,
                            Elf32_Addr val,
                            Elf32_Shdr *sechdrs,
                            struct module *mod)
{
        struct ppc_plt_entry *entry;
 
        DEBUGP("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location);
        /* Init, or core PLT? */
        if (location >= mod->module_core
            && location < mod->module_core + mod->core_size)
                entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;
        else
                entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;
 
        /* Find this entry, or if that fails, the next avail. entry */
        while (entry->jump[0]) {
                if (entry_matches(entry, val)) return (uint32_t)entry;
                entry++;
        }
 
        /* Stolen from Paul Mackerras as well... */
        entry->jump[0] = 0x3d600000+((val+0x8000)>>16);  /* lis r11,sym@ha */
        entry->jump[1] = 0x396b0000 + (val&0xffff);     /* addi r11,r11,sym@l*/
        entry->jump[2] = 0x7d6903a6;                    /* mtctr r11 */
        entry->jump[3] = 0x4e800420;                    /* bctr */
 
        DEBUGP("Initialized plt for 0x%x at %p\n", val, entry);
        return (uint32_t)entry;
}
 
int apply_relocate_add(Elf32_Shdr *sechdrs,
                       const char *strtab,
                       unsigned int symindex,
                       unsigned int relsec,
                       struct module *module)
{
        unsigned int i;
        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
        Elf32_Sym *sym;
        uint32_t *location;
        uint32_t value;
 
        DEBUGP("Applying ADD relocate section %u to %u\n", relsec,
               sechdrs[relsec].sh_info);
        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
                /* This is where to make the change */
                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                        + rela[i].r_offset;
                /* This is the symbol it is referring to.  Note that all
                   undefined symbols have been resolved.  */
                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
                        + ELF32_R_SYM(rela[i].r_info);
                /* `Everything is relative'. */
                value = sym->st_value + rela[i].r_addend;
 
                switch (ELF32_R_TYPE(rela[i].r_info)) {
                case R_PPC_ADDR32:
                        /* Simply set it */
                        *(uint32_t *)location = value;
                        break;
 
                case R_PPC_ADDR16_LO:
                        /* Low half of the symbol */
                        *(uint16_t *)location = value;
                        break;
 
                case R_PPC_ADDR16_HI:
                        /* Higher half of the symbol */
                        *(uint16_t *)location = (value >> 16);
                        break;
 
                case R_PPC_ADDR16_HA:
                        /* Sign-adjusted lower 16 bits: PPC ELF ABI says:
                           (((x >> 16) + ((x & 0x8000) ? 1 : 0))) & 0xFFFF.
                           This is the same, only sane.
                         */
                        *(uint16_t *)location = (value + 0x8000) >> 16;
                        break;
 
                case R_PPC_REL24:
                        if ((int)(value - (uint32_t)location) < -0x02000000
                            || (int)(value - (uint32_t)location) >= 0x02000000)
                                value = do_plt_call(location, value,
                                                    sechdrs, module);
 
                        /* Only replace bits 2 through 26 */
                        DEBUGP("REL24 value = %08X. location = %08X\n",
                               value, (uint32_t)location);
                        DEBUGP("Location before: %08X.\n",
                               *(uint32_t *)location);
                        *(uint32_t *)location
                                = (*(uint32_t *)location & ~0x03fffffc)
                                | ((value - (uint32_t)location)
                                   & 0x03fffffc);
                        DEBUGP("Location after: %08X.\n",
                               *(uint32_t *)location);
                        DEBUGP("ie. jump to %08X+%08X = %08X\n",
                               *(uint32_t *)location & 0x03fffffc,
                               (uint32_t)location,
                               (*(uint32_t *)location & 0x03fffffc)
                               + (uint32_t)location);
                        break;
 
                case R_PPC_REL32:
                        /* 32-bit relative jump. */
                        *(uint32_t *)location = value - (uint32_t)location;
                        break;
 
                default:
                        printk("%s: unknown ADD relocation: %u\n",
                               module->name,
                               ELF32_R_TYPE(rela[i].r_info));
                        return -ENOEXEC;
                }
        }
        return 0;
}
 
static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
                                    const Elf_Shdr *sechdrs,
                                    const char *name)
{
        char *secstrings;
        unsigned int i;
 
        secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
        for (i = 1; i < hdr->e_shnum; i++)
                if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
                        return &sechdrs[i];
        return NULL;
}
 
int module_finalize(const Elf_Ehdr *hdr,
                    const Elf_Shdr *sechdrs,
                    struct module *me)
{
        const Elf_Shdr *sect;
        int err;
 
        err = module_bug_finalize(hdr, sechdrs, me);
        if (err)                /* never true, currently */
                return err;
 
        /* Apply feature fixups */
        sect = find_section(hdr, sechdrs, "__ftr_fixup");
        if (sect != NULL)
                do_feature_fixups(cur_cpu_spec->cpu_features,
                                  (void *)sect->sh_addr,
                                  (void *)sect->sh_addr + sect->sh_size);
 
        return 0;
}
 
void module_arch_cleanup(struct module *mod)
{
        module_bug_cleanup(mod);
}
 
struct bug_entry *module_find_bug(unsigned long bugaddr)
{
        struct mod_arch_specific *mod;
        unsigned int i;
        struct bug_entry *bug;
 
        list_for_each_entry(mod, &module_bug_list, bug_list) {
                bug = mod->bug_table;
                for (i = 0; i < mod->num_bugs; ++i, ++bug)
                        if (bugaddr == bug->bug_addr)
                                return bug;
        }
        return NULL;
}

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Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [powerpc/] [kernel/] [module_32.c] - Blame information for rev 17

Line No.	Rev	Author	Line
1	3	xianfeng	`/* Kernel module help for PPC.`
2			`Copyright (C) 2001 Rusty Russell.`
3
4			`This program is free software; you can redistribute it and/or modify`
5			`it under the terms of the GNU General Public License as published by`
6			`the Free Software Foundation; either version 2 of the License, or`
7			`(at your option) any later version.`
8
9			`This program is distributed in the hope that it will be useful,`
10			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
11			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
12			`GNU General Public License for more details.`
13
14			`You should have received a copy of the GNU General Public License`
15			`along with this program; if not, write to the Free Software`
16			`Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA`
17			`*/`
18			`#include <linux/module.h>`
19			`#include <linux/moduleloader.h>`
20			`#include <linux/elf.h>`
21			`#include <linux/vmalloc.h>`
22			`#include <linux/fs.h>`
23			`#include <linux/string.h>`
24			`#include <linux/kernel.h>`
25			`#include <linux/cache.h>`
26			`#include <linux/bug.h>`
27
28			`#include "setup.h"`
29
30			`#if 0`
31			`#define DEBUGP printk`
32			`#else`
33			`#define DEBUGP(fmt , ...)`
34			`#endif`
35
36			`LIST_HEAD(module_bug_list);`
37
38			`void *module_alloc(unsigned long size)`
39			`{`
40			`if (size == 0)`
41			`return NULL;`
42			`return vmalloc(size);`
43			`}`
44
45			`/* Free memory returned from module_alloc */`
46			`void module_free(struct module mod, void module_region)`
47			`{`
48			`vfree(module_region);`
49			`/* FIXME: If module_region == mod->init_region, trim exception`
50			`table entries. */`
51			`}`
52
53			`/* Count how many different relocations (different symbol, different`
54			`addend) */`
55			`static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num)`
56			`{`
57			`unsigned int i, j, ret = 0;`
58
59			`/* Sure, this is order(n^2), but it's usually short, and not`
60			`time critical */`
61			`for (i = 0; i < num; i++) {`
62			`for (j = 0; j < i; j++) {`
63			`/* If this addend appeared before, it's`
64			`already been counted */`
65			`if (ELF32_R_SYM(rela[i].r_info)`
66			`== ELF32_R_SYM(rela[j].r_info)`
67			`&& rela[i].r_addend == rela[j].r_addend)`
68			`break;`
69			`}`
70			`if (j == i) ret++;`
71			`}`
72			`return ret;`
73			`}`
74
75			`/* Get the potential trampolines size required of the init and`
76			`non-init sections */`
77			`static unsigned long get_plt_size(const Elf32_Ehdr *hdr,`
78			`const Elf32_Shdr *sechdrs,`
79			`const char *secstrings,`
80			`int is_init)`
81			`{`
82			`unsigned long ret = 0;`
83			`unsigned i;`
84
85			`/* Everything marked ALLOC (this includes the exported`
86			`symbols) */`
87			`for (i = 1; i < hdr->e_shnum; i++) {`
88			`/* If it's called .init, and we're not init, we're`
89			`not interested */`
90			`if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)`
91			`!= is_init)`
92			`continue;`
93
94			`/* We don't want to look at debug sections. */`
95			`if (strstr(secstrings + sechdrs[i].sh_name, ".debug") != 0)`
96			`continue;`
97
98			`if (sechdrs[i].sh_type == SHT_RELA) {`
99			`DEBUGP("Found relocations in section %u\n", i);`
100			`DEBUGP("Ptr: %p. Number: %u\n",`
101			`(void *)hdr + sechdrs[i].sh_offset,`
102			`sechdrs[i].sh_size / sizeof(Elf32_Rela));`
103			`ret += count_relocs((void *)hdr`
104			`+ sechdrs[i].sh_offset,`
105			`sechdrs[i].sh_size`
106			`/ sizeof(Elf32_Rela))`
107			`* sizeof(struct ppc_plt_entry);`
108			`}`
109			`}`
110
111			`return ret;`
112			`}`
113
114			`int module_frob_arch_sections(Elf32_Ehdr *hdr,`
115			`Elf32_Shdr *sechdrs,`
116			`char *secstrings,`
117			`struct module *me)`
118			`{`
119			`unsigned int i;`
120
121			`/* Find .plt and .init.plt sections */`
122			`for (i = 0; i < hdr->e_shnum; i++) {`
123			`if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0)`
124			`me->arch.init_plt_section = i;`
125			`else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0)`
126			`me->arch.core_plt_section = i;`
127			`}`
128			`if (!me->arch.core_plt_section \|\| !me->arch.init_plt_section) {`
129			`printk("Module doesn't contain .plt or .init.plt sections.\n");`
130			`return -ENOEXEC;`
131			`}`
132
133			`/* Override their sizes */`
134			`sechdrs[me->arch.core_plt_section].sh_size`
135			`= get_plt_size(hdr, sechdrs, secstrings, 0);`
136			`sechdrs[me->arch.init_plt_section].sh_size`
137			`= get_plt_size(hdr, sechdrs, secstrings, 1);`
138			`return 0;`
139			`}`
140
141			`int apply_relocate(Elf32_Shdr *sechdrs,`
142			`const char *strtab,`
143			`unsigned int symindex,`
144			`unsigned int relsec,`
145			`struct module *module)`
146			`{`
147			`printk(KERN_ERR "%s: Non-ADD RELOCATION unsupported\n",`
148			`module->name);`
149			`return -ENOEXEC;`
150			`}`
151
152			`static inline int entry_matches(struct ppc_plt_entry *entry, Elf32_Addr val)`
153			`{`
154			`if (entry->jump[0] == 0x3d600000 + ((val + 0x8000) >> 16)`
155			`&& entry->jump[1] == 0x396b0000 + (val & 0xffff))`
156			`return 1;`
157			`return 0;`
158			`}`
159
160			`/* Set up a trampoline in the PLT to bounce us to the distant function */`
161			`static uint32_t do_plt_call(void *location,`
162			`Elf32_Addr val,`
163			`Elf32_Shdr *sechdrs,`
164			`struct module *mod)`
165			`{`
166			`struct ppc_plt_entry *entry;`
167
168			`DEBUGP("Doing plt for call to 0x%x at 0x%x\n", val, (unsigned int)location);`
169			`/* Init, or core PLT? */`
170			`if (location >= mod->module_core`
171			`&& location < mod->module_core + mod->core_size)`
172			`entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;`
173			`else`
174			`entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;`
175
176			`/* Find this entry, or if that fails, the next avail. entry */`
177			`while (entry->jump[0]) {`
178			`if (entry_matches(entry, val)) return (uint32_t)entry;`
179			`entry++;`
180			`}`
181
182			`/* Stolen from Paul Mackerras as well... */`
183			`entry->jump[0] = 0x3d600000+((val+0x8000)>>16); /* lis r11,sym@ha */`
184			`entry->jump[1] = 0x396b0000 + (val&0xffff); /* addi r11,r11,sym@l*/`
185			`entry->jump[2] = 0x7d6903a6; /* mtctr r11 */`
186			`entry->jump[3] = 0x4e800420; /* bctr */`
187
188			`DEBUGP("Initialized plt for 0x%x at %p\n", val, entry);`
189			`return (uint32_t)entry;`
190			`}`
191
192			`int apply_relocate_add(Elf32_Shdr *sechdrs,`
193			`const char *strtab,`
194			`unsigned int symindex,`
195			`unsigned int relsec,`
196			`struct module *module)`
197			`{`
198			`unsigned int i;`
199			`Elf32_Rela rela = (void )sechdrs[relsec].sh_addr;`
200			`Elf32_Sym *sym;`
201			`uint32_t *location;`
202			`uint32_t value;`
203
204			`DEBUGP("Applying ADD relocate section %u to %u\n", relsec,`
205			`sechdrs[relsec].sh_info);`
206			`for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {`
207			`/* This is where to make the change */`
208			`location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr`
209			`+ rela[i].r_offset;`
210			`/* This is the symbol it is referring to. Note that all`
211			`undefined symbols have been resolved. */`
212			`sym = (Elf32_Sym *)sechdrs[symindex].sh_addr`
213			`+ ELF32_R_SYM(rela[i].r_info);`
214			/* `Everything is relative'. */
215			`value = sym->st_value + rela[i].r_addend;`
216
217			`switch (ELF32_R_TYPE(rela[i].r_info)) {`
218			`case R_PPC_ADDR32:`
219			`/* Simply set it */`
220			`(uint32_t )location = value;`
221			`break;`
222
223			`case R_PPC_ADDR16_LO:`
224			`/* Low half of the symbol */`
225			`(uint16_t )location = value;`
226			`break;`
227
228			`case R_PPC_ADDR16_HI:`
229			`/* Higher half of the symbol */`
230			`(uint16_t )location = (value >> 16);`
231			`break;`
232
233			`case R_PPC_ADDR16_HA:`
234			`/* Sign-adjusted lower 16 bits: PPC ELF ABI says:`
235			`(((x >> 16) + ((x & 0x8000) ? 1 : 0))) & 0xFFFF.`
236			`This is the same, only sane.`
237			`*/`
238			`(uint16_t )location = (value + 0x8000) >> 16;`
239			`break;`
240
241			`case R_PPC_REL24:`
242			`if ((int)(value - (uint32_t)location) < -0x02000000`
243			`\|\| (int)(value - (uint32_t)location) >= 0x02000000)`
244			`value = do_plt_call(location, value,`
245			`sechdrs, module);`
246
247			`/* Only replace bits 2 through 26 */`
248			`DEBUGP("REL24 value = %08X. location = %08X\n",`
249			`value, (uint32_t)location);`
250			`DEBUGP("Location before: %08X.\n",`
251			`(uint32_t )location);`
252			`(uint32_t )location`
253			`= ((uint32_t )location & ~0x03fffffc)`
254			`\| ((value - (uint32_t)location)`
255			`& 0x03fffffc);`
256			`DEBUGP("Location after: %08X.\n",`
257			`(uint32_t )location);`
258			`DEBUGP("ie. jump to %08X+%08X = %08X\n",`
259			`(uint32_t )location & 0x03fffffc,`
260			`(uint32_t)location,`
261			`((uint32_t )location & 0x03fffffc)`
262			`+ (uint32_t)location);`
263			`break;`
264
265			`case R_PPC_REL32:`
266			`/* 32-bit relative jump. */`
267			`(uint32_t )location = value - (uint32_t)location;`
268			`break;`
269
270			`default:`
271			`printk("%s: unknown ADD relocation: %u\n",`
272			`module->name,`
273			`ELF32_R_TYPE(rela[i].r_info));`
274			`return -ENOEXEC;`
275			`}`
276			`}`
277			`return 0;`
278			`}`
279
280			`static const Elf_Shdr find_section(const Elf_Ehdr hdr,`
281			`const Elf_Shdr *sechdrs,`
282			`const char *name)`
283			`{`
284			`char *secstrings;`
285			`unsigned int i;`
286
287			`secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;`
288			`for (i = 1; i < hdr->e_shnum; i++)`
289			`if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)`
290			`return &sechdrs[i];`
291			`return NULL;`
292			`}`
293
294			`int module_finalize(const Elf_Ehdr *hdr,`
295			`const Elf_Shdr *sechdrs,`
296			`struct module *me)`
297			`{`
298			`const Elf_Shdr *sect;`
299			`int err;`
300
301			`err = module_bug_finalize(hdr, sechdrs, me);`
302			`if (err) /* never true, currently */`
303			`return err;`
304
305			`/* Apply feature fixups */`
306			`sect = find_section(hdr, sechdrs, "__ftr_fixup");`
307			`if (sect != NULL)`
308			`do_feature_fixups(cur_cpu_spec->cpu_features,`
309			`(void *)sect->sh_addr,`
310			`(void *)sect->sh_addr + sect->sh_size);`
311
312			`return 0;`
313			`}`
314
315			`void module_arch_cleanup(struct module *mod)`
316			`{`
317			`module_bug_cleanup(mod);`
318			`}`
319
320			`struct bug_entry *module_find_bug(unsigned long bugaddr)`
321			`{`
322			`struct mod_arch_specific *mod;`
323			`unsigned int i;`
324			`struct bug_entry *bug;`
325
326			`list_for_each_entry(mod, &module_bug_list, bug_list) {`
327			`bug = mod->bug_table;`
328			`for (i = 0; i < mod->num_bugs; ++i, ++bug)`
329			`if (bugaddr == bug->bug_addr)`
330			`return bug;`
331			`}`
332			`return NULL;`
333			`}`