diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/parisc/kernel/module.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/parisc/kernel/module.c')
-rw-r--r-- | arch/parisc/kernel/module.c | 822 |
1 files changed, 822 insertions, 0 deletions
diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c new file mode 100644 index 000000000000..f27cfe4771b8 --- /dev/null +++ b/arch/parisc/kernel/module.c @@ -0,0 +1,822 @@ +/* Kernel dynamically loadable module help for PARISC. + * + * The best reference for this stuff is probably the Processor- + * Specific ELF Supplement for PA-RISC: + * http://ftp.parisc-linux.org/docs/arch/elf-pa-hp.pdf + * + * Linux/PA-RISC Project (http://www.parisc-linux.org/) + * Copyright (C) 2003 Randolph Chung <tausq at debian . org> + * + * + * 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 + * + * + * Notes: + * - SEGREL32 handling + * We are not doing SEGREL32 handling correctly. According to the ABI, we + * should do a value offset, like this: + * if (is_init(me, (void *)val)) + * val -= (uint32_t)me->module_init; + * else + * val -= (uint32_t)me->module_core; + * However, SEGREL32 is used only for PARISC unwind entries, and we want + * those entries to have an absolute address, and not just an offset. + * + * The unwind table mechanism has the ability to specify an offset for + * the unwind table; however, because we split off the init functions into + * a different piece of memory, it is not possible to do this using a + * single offset. Instead, we use the above hack for now. + */ + +#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 <asm/unwind.h> + +#if 0 +#define DEBUGP printk +#else +#define DEBUGP(fmt...) +#endif + +#define CHECK_RELOC(val, bits) \ + if ( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \ + ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) { \ + printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \ + me->name, strtab + sym->st_name, (unsigned long)val, bits); \ + return -ENOEXEC; \ + } + +/* Maximum number of GOT entries. We use a long displacement ldd from + * the bottom of the table, which has a maximum signed displacement of + * 0x3fff; however, since we're only going forward, this becomes + * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have + * at most 1023 entries */ +#define MAX_GOTS 1023 + +/* three functions to determine where in the module core + * or init pieces the location is */ +static inline int is_init(struct module *me, void *loc) +{ + return (loc >= me->module_init && + loc <= (me->module_init + me->init_size)); +} + +static inline int is_core(struct module *me, void *loc) +{ + return (loc >= me->module_core && + loc <= (me->module_core + me->core_size)); +} + +static inline int is_local(struct module *me, void *loc) +{ + return is_init(me, loc) || is_core(me, loc); +} + + +#ifndef __LP64__ +struct got_entry { + Elf32_Addr addr; +}; + +#define Elf_Fdesc Elf32_Fdesc + +struct stub_entry { + Elf32_Word insns[2]; /* each stub entry has two insns */ +}; +#else +struct got_entry { + Elf64_Addr addr; +}; + +#define Elf_Fdesc Elf64_Fdesc + +struct stub_entry { + Elf64_Word insns[4]; /* each stub entry has four insns */ +}; +#endif + +/* Field selection types defined by hppa */ +#define rnd(x) (((x)+0x1000)&~0x1fff) +/* fsel: full 32 bits */ +#define fsel(v,a) ((v)+(a)) +/* lsel: select left 21 bits */ +#define lsel(v,a) (((v)+(a))>>11) +/* rsel: select right 11 bits */ +#define rsel(v,a) (((v)+(a))&0x7ff) +/* lrsel with rounding of addend to nearest 8k */ +#define lrsel(v,a) (((v)+rnd(a))>>11) +/* rrsel with rounding of addend to nearest 8k */ +#define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a))) + +#define mask(x,sz) ((x) & ~((1<<(sz))-1)) + + +/* The reassemble_* functions prepare an immediate value for + insertion into an opcode. pa-risc uses all sorts of weird bitfields + in the instruction to hold the value. */ +static inline int reassemble_14(int as14) +{ + return (((as14 & 0x1fff) << 1) | + ((as14 & 0x2000) >> 13)); +} + +static inline int reassemble_17(int as17) +{ + return (((as17 & 0x10000) >> 16) | + ((as17 & 0x0f800) << 5) | + ((as17 & 0x00400) >> 8) | + ((as17 & 0x003ff) << 3)); +} + +static inline int reassemble_21(int as21) +{ + return (((as21 & 0x100000) >> 20) | + ((as21 & 0x0ffe00) >> 8) | + ((as21 & 0x000180) << 7) | + ((as21 & 0x00007c) << 14) | + ((as21 & 0x000003) << 12)); +} + +static inline int reassemble_22(int as22) +{ + return (((as22 & 0x200000) >> 21) | + ((as22 & 0x1f0000) << 5) | + ((as22 & 0x00f800) << 5) | + ((as22 & 0x000400) >> 8) | + ((as22 & 0x0003ff) << 3)); +} + +void *module_alloc(unsigned long size) +{ + if (size == 0) + return NULL; + return vmalloc(size); +} + +#ifndef __LP64__ +static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) +{ + return 0; +} + +static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) +{ + return 0; +} + +static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) +{ + unsigned long cnt = 0; + + for (; n > 0; n--, rela++) + { + switch (ELF32_R_TYPE(rela->r_info)) { + case R_PARISC_PCREL17F: + case R_PARISC_PCREL22F: + cnt++; + } + } + + return cnt; +} +#else +static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) +{ + unsigned long cnt = 0; + + for (; n > 0; n--, rela++) + { + switch (ELF64_R_TYPE(rela->r_info)) { + case R_PARISC_LTOFF21L: + case R_PARISC_LTOFF14R: + case R_PARISC_PCREL22F: + cnt++; + } + } + + return cnt; +} + +static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) +{ + unsigned long cnt = 0; + + for (; n > 0; n--, rela++) + { + switch (ELF64_R_TYPE(rela->r_info)) { + case R_PARISC_FPTR64: + cnt++; + } + } + + return cnt; +} + +static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) +{ + unsigned long cnt = 0; + + for (; n > 0; n--, rela++) + { + switch (ELF64_R_TYPE(rela->r_info)) { + case R_PARISC_PCREL22F: + cnt++; + } + } + + return cnt; +} +#endif + + +/* 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. */ +} + +#define CONST +int module_frob_arch_sections(CONST Elf_Ehdr *hdr, + CONST Elf_Shdr *sechdrs, + CONST char *secstrings, + struct module *me) +{ + unsigned long gots = 0, fdescs = 0, stubs = 0, init_stubs = 0; + unsigned int i; + + for (i = 1; i < hdr->e_shnum; i++) { + const Elf_Rela *rels = (void *)hdr + sechdrs[i].sh_offset; + unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels); + + if (strncmp(secstrings + sechdrs[i].sh_name, + ".PARISC.unwind", 14) == 0) + me->arch.unwind_section = i; + + if (sechdrs[i].sh_type != SHT_RELA) + continue; + + /* some of these are not relevant for 32-bit/64-bit + * we leave them here to make the code common. the + * compiler will do its thing and optimize out the + * stuff we don't need + */ + gots += count_gots(rels, nrels); + fdescs += count_fdescs(rels, nrels); + if(strncmp(secstrings + sechdrs[i].sh_name, + ".rela.init", 10) == 0) + init_stubs += count_stubs(rels, nrels); + else + stubs += count_stubs(rels, nrels); + } + + /* align things a bit */ + me->core_size = ALIGN(me->core_size, 16); + me->arch.got_offset = me->core_size; + me->core_size += gots * sizeof(struct got_entry); + + me->core_size = ALIGN(me->core_size, 16); + me->arch.fdesc_offset = me->core_size; + me->core_size += fdescs * sizeof(Elf_Fdesc); + + me->core_size = ALIGN(me->core_size, 16); + me->arch.stub_offset = me->core_size; + me->core_size += stubs * sizeof(struct stub_entry); + + me->init_size = ALIGN(me->init_size, 16); + me->arch.init_stub_offset = me->init_size; + me->init_size += init_stubs * sizeof(struct stub_entry); + + me->arch.got_max = gots; + me->arch.fdesc_max = fdescs; + me->arch.stub_max = stubs; + me->arch.init_stub_max = init_stubs; + + return 0; +} + +#ifdef __LP64__ +static Elf64_Word get_got(struct module *me, unsigned long value, long addend) +{ + unsigned int i; + struct got_entry *got; + + value += addend; + + BUG_ON(value == 0); + + got = me->module_core + me->arch.got_offset; + for (i = 0; got[i].addr; i++) + if (got[i].addr == value) + goto out; + + BUG_ON(++me->arch.got_count > me->arch.got_max); + + got[i].addr = value; + out: + DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry), + value); + return i * sizeof(struct got_entry); +} +#endif /* __LP64__ */ + +#ifdef __LP64__ +static Elf_Addr get_fdesc(struct module *me, unsigned long value) +{ + Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset; + + if (!value) { + printk(KERN_ERR "%s: zero OPD requested!\n", me->name); + return 0; + } + + /* Look for existing fdesc entry. */ + while (fdesc->addr) { + if (fdesc->addr == value) + return (Elf_Addr)fdesc; + fdesc++; + } + + BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max); + + /* Create new one */ + fdesc->addr = value; + fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset; + return (Elf_Addr)fdesc; +} +#endif /* __LP64__ */ + +static Elf_Addr get_stub(struct module *me, unsigned long value, long addend, + int millicode, int init_section) +{ + unsigned long i; + struct stub_entry *stub; + + if(init_section) { + i = me->arch.init_stub_count++; + BUG_ON(me->arch.init_stub_count > me->arch.init_stub_max); + stub = me->module_init + me->arch.init_stub_offset + + i * sizeof(struct stub_entry); + } else { + i = me->arch.stub_count++; + BUG_ON(me->arch.stub_count > me->arch.stub_max); + stub = me->module_core + me->arch.stub_offset + + i * sizeof(struct stub_entry); + } + +#ifndef __LP64__ +/* for 32-bit the stub looks like this: + * ldil L'XXX,%r1 + * be,n R'XXX(%sr4,%r1) + */ + //value = *(unsigned long *)((value + addend) & ~3); /* why? */ + + stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */ + stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */ + + stub->insns[0] |= reassemble_21(lrsel(value, addend)); + stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4); + +#else +/* for 64-bit we have two kinds of stubs: + * for normal function calls: + * ldd 0(%dp),%dp + * ldd 10(%dp), %r1 + * bve (%r1) + * ldd 18(%dp), %dp + * + * for millicode: + * ldil 0, %r1 + * ldo 0(%r1), %r1 + * ldd 10(%r1), %r1 + * bve,n (%r1) + */ + if (!millicode) + { + stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */ + stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */ + stub->insns[2] = 0xe820d000; /* bve (%r1) */ + stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */ + + stub->insns[0] |= reassemble_14(get_got(me, value, addend) & 0x3fff); + } + else + { + stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ + stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ + stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */ + stub->insns[3] = 0xe820d002; /* bve,n (%r1) */ + + stub->insns[0] |= reassemble_21(lrsel(value, addend)); + stub->insns[1] |= reassemble_14(rrsel(value, addend)); + } +#endif + + return (Elf_Addr)stub; +} + +int apply_relocate(Elf_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + /* parisc should not need this ... */ + printk(KERN_ERR "module %s: RELOCATION unsupported\n", + me->name); + return -ENOEXEC; +} + +#ifndef __LP64__ +int apply_relocate_add(Elf_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + int i; + Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; + Elf32_Sym *sym; + Elf32_Word *loc; + Elf32_Addr val; + Elf32_Sword addend; + Elf32_Addr dot; + //unsigned long dp = (unsigned long)$global$; + register unsigned long dp asm ("r27"); + + DEBUGP("Applying relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + /* This is where to make the change */ + loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rel[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM(rel[i].r_info); + if (!sym->st_value) { + printk(KERN_WARNING "%s: Unknown symbol %s\n", + me->name, strtab + sym->st_name); + return -ENOENT; + } + //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; + dot = (Elf32_Addr)loc & ~0x03; + + val = sym->st_value; + addend = rel[i].r_addend; + +#if 0 +#define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t : + DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n", + strtab + sym->st_name, + (uint32_t)loc, val, addend, + r(R_PARISC_PLABEL32) + r(R_PARISC_DIR32) + r(R_PARISC_DIR21L) + r(R_PARISC_DIR14R) + r(R_PARISC_SEGREL32) + r(R_PARISC_DPREL21L) + r(R_PARISC_DPREL14R) + r(R_PARISC_PCREL17F) + r(R_PARISC_PCREL22F) + "UNKNOWN"); +#undef r +#endif + + switch (ELF32_R_TYPE(rel[i].r_info)) { + case R_PARISC_PLABEL32: + /* 32-bit function address */ + /* no function descriptors... */ + *loc = fsel(val, addend); + break; + case R_PARISC_DIR32: + /* direct 32-bit ref */ + *loc = fsel(val, addend); + break; + case R_PARISC_DIR21L: + /* left 21 bits of effective address */ + val = lrsel(val, addend); + *loc = mask(*loc, 21) | reassemble_21(val); + break; + case R_PARISC_DIR14R: + /* right 14 bits of effective address */ + val = rrsel(val, addend); + *loc = mask(*loc, 14) | reassemble_14(val); + break; + case R_PARISC_SEGREL32: + /* 32-bit segment relative address */ + /* See note about special handling of SEGREL32 at + * the beginning of this file. + */ + *loc = fsel(val, addend); + break; + case R_PARISC_DPREL21L: + /* left 21 bit of relative address */ + val = lrsel(val - dp, addend); + *loc = mask(*loc, 21) | reassemble_21(val); + break; + case R_PARISC_DPREL14R: + /* right 14 bit of relative address */ + val = rrsel(val - dp, addend); + *loc = mask(*loc, 14) | reassemble_14(val); + break; + case R_PARISC_PCREL17F: + /* 17-bit PC relative address */ + val = get_stub(me, val, addend, 0, is_init(me, loc)); + val = (val - dot - 8)/4; + CHECK_RELOC(val, 17) + *loc = (*loc & ~0x1f1ffd) | reassemble_17(val); + break; + case R_PARISC_PCREL22F: + /* 22-bit PC relative address; only defined for pa20 */ + val = get_stub(me, val, addend, 0, is_init(me, loc)); + DEBUGP("STUB FOR %s loc %lx+%lx at %lx\n", + strtab + sym->st_name, (unsigned long)loc, addend, + val) + val = (val - dot - 8)/4; + CHECK_RELOC(val, 22); + *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); + break; + + default: + printk(KERN_ERR "module %s: Unknown relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } + } + + return 0; +} + +#else +int apply_relocate_add(Elf_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, + unsigned int relsec, + struct module *me) +{ + int i; + Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; + Elf64_Sym *sym; + Elf64_Word *loc; + Elf64_Xword *loc64; + Elf64_Addr val; + Elf64_Sxword addend; + Elf64_Addr dot; + + DEBUGP("Applying relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { + /* This is where to make the change */ + loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rel[i].r_offset; + /* This is the symbol it is referring to */ + sym = (Elf64_Sym *)sechdrs[symindex].sh_addr + + ELF64_R_SYM(rel[i].r_info); + if (!sym->st_value) { + printk(KERN_WARNING "%s: Unknown symbol %s\n", + me->name, strtab + sym->st_name); + return -ENOENT; + } + //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; + dot = (Elf64_Addr)loc & ~0x03; + loc64 = (Elf64_Xword *)loc; + + val = sym->st_value; + addend = rel[i].r_addend; + +#if 0 +#define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t : + printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n", + strtab + sym->st_name, + loc, val, addend, + r(R_PARISC_LTOFF14R) + r(R_PARISC_LTOFF21L) + r(R_PARISC_PCREL22F) + r(R_PARISC_DIR64) + r(R_PARISC_SEGREL32) + r(R_PARISC_FPTR64) + "UNKNOWN"); +#undef r +#endif + + switch (ELF64_R_TYPE(rel[i].r_info)) { + case R_PARISC_LTOFF21L: + /* LT-relative; left 21 bits */ + val = get_got(me, val, addend); + DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n", + strtab + sym->st_name, + loc, val); + val = lrsel(val, 0); + *loc = mask(*loc, 21) | reassemble_21(val); + break; + case R_PARISC_LTOFF14R: + /* L(ltoff(val+addend)) */ + /* LT-relative; right 14 bits */ + val = get_got(me, val, addend); + val = rrsel(val, 0); + DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n", + strtab + sym->st_name, + loc, val); + *loc = mask(*loc, 14) | reassemble_14(val); + break; + case R_PARISC_PCREL22F: + /* PC-relative; 22 bits */ + DEBUGP("PCREL22F Symbol %s loc %p val %lx\n", + strtab + sym->st_name, + loc, val); + /* can we reach it locally? */ + if(!is_local(me, (void *)val)) { + if (strncmp(strtab + sym->st_name, "$$", 2) + == 0) + val = get_stub(me, val, addend, 1, + is_init(me, loc)); + else + val = get_stub(me, val, addend, 0, + is_init(me, loc)); + } + DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n", + strtab + sym->st_name, loc, sym->st_value, + addend, val); + /* FIXME: local symbols work as long as the + * core and init pieces aren't separated too + * far. If this is ever broken, you will trip + * the check below. The way to fix it would + * be to generate local stubs to go between init + * and core */ + if((Elf64_Sxword)(val - dot - 8) > 0x800000 -1 || + (Elf64_Sxword)(val - dot - 8) < -0x800000) { + printk(KERN_ERR "Module %s, symbol %s is out of range for PCREL22F relocation\n", + me->name, strtab + sym->st_name); + return -ENOEXEC; + } + val = (val - dot - 8)/4; + *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); + break; + case R_PARISC_DIR64: + /* 64-bit effective address */ + *loc64 = val + addend; + break; + case R_PARISC_SEGREL32: + /* 32-bit segment relative address */ + /* See note about special handling of SEGREL32 at + * the beginning of this file. + */ + *loc = fsel(val, addend); + break; + case R_PARISC_FPTR64: + /* 64-bit function address */ + if(is_local(me, (void *)(val + addend))) { + *loc64 = get_fdesc(me, val+addend); + DEBUGP("FDESC for %s at %p points to %lx\n", + strtab + sym->st_name, *loc64, + ((Elf_Fdesc *)*loc64)->addr); + } else { + /* if the symbol is not local to this + * module then val+addend is a pointer + * to the function descriptor */ + DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n", + strtab + sym->st_name, + loc, val); + *loc64 = val + addend; + } + break; + + default: + printk(KERN_ERR "module %s: Unknown relocation: %Lu\n", + me->name, ELF64_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } + } + return 0; +} +#endif + +static void +register_unwind_table(struct module *me, + const Elf_Shdr *sechdrs) +{ + unsigned char *table, *end; + unsigned long gp; + + if (!me->arch.unwind_section) + return; + + table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr; + end = table + sechdrs[me->arch.unwind_section].sh_size; + gp = (Elf_Addr)me->module_core + me->arch.got_offset; + + DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n", + me->arch.unwind_section, table, end, gp); + me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end); +} + +static void +deregister_unwind_table(struct module *me) +{ + if (me->arch.unwind) + unwind_table_remove(me->arch.unwind); +} + +int module_finalize(const Elf_Ehdr *hdr, + const Elf_Shdr *sechdrs, + struct module *me) +{ + int i; + unsigned long nsyms; + const char *strtab = NULL; + Elf_Sym *newptr, *oldptr; + Elf_Shdr *symhdr = NULL; +#ifdef DEBUG + Elf_Fdesc *entry; + u32 *addr; + + entry = (Elf_Fdesc *)me->init; + printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry, + entry->gp, entry->addr); + addr = (u32 *)entry->addr; + printk("INSNS: %x %x %x %x\n", + addr[0], addr[1], addr[2], addr[3]); + printk("stubs used %ld, stubs max %ld\n" + "init_stubs used %ld, init stubs max %ld\n" + "got entries used %ld, gots max %ld\n" + "fdescs used %ld, fdescs max %ld\n", + me->arch.stub_count, me->arch.stub_max, + me->arch.init_stub_count, me->arch.init_stub_max, + me->arch.got_count, me->arch.got_max, + me->arch.fdesc_count, me->arch.fdesc_max); +#endif + + register_unwind_table(me, sechdrs); + + /* haven't filled in me->symtab yet, so have to find it + * ourselves */ + for (i = 1; i < hdr->e_shnum; i++) { + if(sechdrs[i].sh_type == SHT_SYMTAB + && (sechdrs[i].sh_type & SHF_ALLOC)) { + int strindex = sechdrs[i].sh_link; + /* FIXME: AWFUL HACK + * The cast is to drop the const from + * the sechdrs pointer */ + symhdr = (Elf_Shdr *)&sechdrs[i]; + strtab = (char *)sechdrs[strindex].sh_addr; + break; + } + } + + DEBUGP("module %s: strtab %p, symhdr %p\n", + me->name, strtab, symhdr); + + if(me->arch.got_count > MAX_GOTS) { + printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d\n", me->name, me->arch.got_count, MAX_GOTS); + return -EINVAL; + } + + /* no symbol table */ + if(symhdr == NULL) + return 0; + + oldptr = (void *)symhdr->sh_addr; + newptr = oldptr + 1; /* we start counting at 1 */ + nsyms = symhdr->sh_size / sizeof(Elf_Sym); + DEBUGP("OLD num_symtab %lu\n", nsyms); + + for (i = 1; i < nsyms; i++) { + oldptr++; /* note, count starts at 1 so preincrement */ + if(strncmp(strtab + oldptr->st_name, + ".L", 2) == 0) + continue; + + if(newptr != oldptr) + *newptr++ = *oldptr; + else + newptr++; + + } + nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; + DEBUGP("NEW num_symtab %lu\n", nsyms); + symhdr->sh_size = nsyms * sizeof(Elf_Sym); + return 0; +} + +void module_arch_cleanup(struct module *mod) +{ + deregister_unwind_table(mod); +} |