From 90fe7fea10b69d85c4d53e7061aaf85657136530 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Tue, 20 Feb 2001 20:47:08 +0000 Subject: Apply a patch from Magnus Damm to support powerpc with busybox insmod -Erik --- modutils/insmod.c | 199 +++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 161 insertions(+), 38 deletions(-) (limited to 'modutils') diff --git a/modutils/insmod.c b/modutils/insmod.c index 166f0fc4b..7af135902 100644 --- a/modutils/insmod.c +++ b/modutils/insmod.c @@ -14,6 +14,12 @@ * very minor changes required to also work with StrongArm and presumably * all ARM based systems. * + * Magnus Damm added PowerPC support 20-Feb-2001. + * PowerPC specific code stolen from modutils-2.3.16, + * written by Paul Mackerras, Copyright 1996, 1997 Linux International. + * I've only tested the code on mpc8xx platforms in big-endian mode. + * Did some cleanup and added BB_USE_xxx_ENTRIES... + * * Based almost entirely on the Linux modutils-2.3.11 implementation. * Copyright 1996, 1997 Linux International. * New implementation contributed by Richard Henderson @@ -52,6 +58,28 @@ #include #include "busybox.h" +#if defined(__powerpc__) +#define BB_USE_PLT_ENTRIES +#define BB_PLT_ENTRY_SIZE 16 +#endif + +#if defined(__arm__) +#define BB_USE_PLT_ENTRIES +#define BB_PLT_ENTRY_SIZE 8 +#define BB_USE_GOT_ENTRIES +#define BB_GOT_ENTRY_SIZE 8 +#endif + +#if defined(__sh__) +#define BB_USE_GOT_ENTRIES +#define BB_GOT_ENTRY_SIZE 4 +#endif + +#if defined(__i386__) +#define BB_USE_GOT_ENTRIES +#define BB_GOT_ENTRY_SIZE 4 +#endif + //---------------------------------------------------------------------------- //--------modutils module.h, lines 45-242 //---------------------------------------------------------------------------- @@ -81,7 +109,7 @@ #ifndef MODUTILS_MODULE_H static const int MODUTILS_MODULE_H = 1; -#ident "$Id: insmod.c,v 1.48 2001/02/20 06:14:07 andersen Exp $" +#ident "$Id: insmod.c,v 1.49 2001/02/20 20:47:08 andersen Exp $" /* This file contains the structures used by the 2.0 and 2.1 kernels. We do not use the kernel headers directly because we do not wish @@ -287,7 +315,7 @@ int delete_module(const char *); #ifndef MODUTILS_OBJ_H static const int MODUTILS_OBJ_H = 1; -#ident "$Id: insmod.c,v 1.48 2001/02/20 06:14:07 andersen Exp $" +#ident "$Id: insmod.c,v 1.49 2001/02/20 20:47:08 andersen Exp $" /* The relocatable object is manipulated using elfin types. */ @@ -311,21 +339,27 @@ static const int MODUTILS_OBJ_H = 1; #endif #define ELFCLASSM ELFCLASS32 -#define ELFDATAM ELFDATA2LSB - - #if defined(__sh__) #define MATCH_MACHINE(x) (x == EM_SH) #define SHT_RELM SHT_RELA #define Elf32_RelM Elf32_Rela +#define ELFDATAM ELFDATA2LSB #elif defined(__arm__) #define MATCH_MACHINE(x) (x == EM_ARM) #define SHT_RELM SHT_REL #define Elf32_RelM Elf32_Rel +#define ELFDATAM ELFDATA2LSB + +#elif defined(__powerpc__) + +#define MATCH_MACHINE(x) (x == EM_PPC) +#define SHT_RELM SHT_RELA +#define Elf32_RelM Elf32_Rela +#define ELFDATAM ELFDATA2MSB #elif defined(__i386__) @@ -340,6 +374,7 @@ static const int MODUTILS_OBJ_H = 1; #define SHT_RELM SHT_REL #define Elf32_RelM Elf32_Rel +#define ELFDATAM ELFDATA2LSB #else #error Sorry, but insmod.c does not yet support this architecture... @@ -540,8 +575,10 @@ int flag_export = 1; /* Done ;-) */ -#if defined(__arm__) -struct arm_plt_entry + + +#if defined(BB_USE_PLT_ENTRIES) +struct arch_plt_entry { int offset; int allocated:1; @@ -549,26 +586,32 @@ struct arm_plt_entry }; #endif +#if defined(BB_USE_GOT_ENTRIES) struct arch_got_entry { int offset; unsigned offset_done:1; unsigned reloc_done:1; }; +#endif struct arch_file { struct obj_file root; -#if defined(__arm__) - struct obj_section *plt; +#if defined(BB_USE_PLT_ENTRIES) + struct obj_section *plt; #endif +#if defined(BB_USE_GOT_ENTRIES) struct obj_section *got; +#endif }; struct arch_symbol { struct obj_symbol root; -#if defined(__arm__) - struct arm_plt_entry pltent; +#if defined(BB_USE_PLT_ENTRIES) + struct arch_plt_entry pltent; #endif +#if defined(BB_USE_GOT_ENTRIES) struct arch_got_entry gotent; +#endif }; @@ -618,7 +661,8 @@ extern int delete_module(const char *); _syscall1(int, get_kernel_syms, struct old_kernel_sym *, ks) #endif -#if defined(__i386__) || defined(__m68k__) || defined(__arm__) +#if defined(__i386__) || defined(__m68k__) || defined(__arm__) \ + || defined(__powerpc__) /* Jump through hoops to fixup error return codes */ #define __NR__create_module __NR_create_module static inline _syscall2(long, _create_module, const char *, name, size_t, @@ -673,7 +717,14 @@ struct obj_file *arch_new_file(void) { struct arch_file *f; f = xmalloc(sizeof(*f)); + +#if defined(BB_USE_PLT_ENTRIES) + f->plt = NULL; +#endif +#if defined(BB_USE_GOT_ENTRIES) f->got = NULL; +#endif + return &f->root; } @@ -686,7 +737,14 @@ struct obj_symbol *arch_new_symbol(void) { struct arch_symbol *sym; sym = xmalloc(sizeof(*sym)); + +#if defined(BB_USE_PLT_ENTRIES) + memset(&sym->pltent, 0, sizeof(sym->pltent)); +#endif +#if defined(BB_USE_GOT_ENTRIES) memset(&sym->gotent, 0, sizeof(sym->gotent)); +#endif + return &sym->root; } @@ -702,14 +760,14 @@ arch_apply_relocation(struct obj_file *f, ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset); ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset; +#if defined(BB_USE_GOT_ENTRIES) ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0; -#if defined(__arm__) +#endif +#if defined(BB_USE_PLT_ENTRIES) ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0; - - struct arm_plt_entry *pe; + struct arch_plt_entry *pe; unsigned long *ip; #endif - enum obj_reloc ret = obj_reloc_ok; switch (ELF32_R_TYPE(rel->r_info)) { @@ -723,6 +781,8 @@ arch_apply_relocation(struct obj_file *f, case R_ARM_NONE: #elif defined(__i386__) case R_386_NONE: +#elif defined(__powerpc__) + case R_PPC_NONE: #endif break; @@ -731,11 +791,27 @@ arch_apply_relocation(struct obj_file *f, #elif defined(__arm__) case R_ARM_ABS32: #elif defined(__i386__) - case R_386_32: + case R_386_32: +#elif defined(__powerpc__) + case R_PPC_ADDR32: #endif *loc += v; break; +#if defined(__powerpc__) + case R_PPC_ADDR16_HA: + *(unsigned short *)loc = (v + 0x8000) >> 16; + break; + + case R_PPC_ADDR16_HI: + *(unsigned short *)loc = v >> 16; + break; + + case R_PPC_ADDR16_LO: + *(unsigned short *)loc = v; + break; +#endif + #if defined(__arm__) #elif defined(__sh__) case R_SH_REL32: @@ -746,22 +822,48 @@ arch_apply_relocation(struct obj_file *f, case R_386_PC32: *loc += v - dot; break; +#elif defined(__powerpc__) + case R_PPC_REL32: + *loc = v - dot; + break; #endif #if defined(__sh__) case R_SH_PLT32: *loc = v - dot; break; -#elif defined(__arm__) +#elif defined(__i386__) +#endif + +#if defined(BB_USE_PLT_ENTRIES) + +#if defined(__arm__) case R_ARM_PC24: case R_ARM_PLT32: +#endif +#if defined(__powerpc__) + case R_PPC_REL24: +#endif /* find the plt entry and initialize it if necessary */ assert(isym != NULL); - pe = (struct arm_plt_entry*) &isym->pltent; + + pe = (struct arch_plt_entry*) &isym->pltent; + if (! pe->inited) { ip = (unsigned long *) (ifile->plt->contents + pe->offset); + + /* generate some machine code */ + +#if defined(__arm__) ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */ ip[1] = v; /* sym@ */ +#endif +#if defined(__powerpc__) + ip[0] = 0x3d600000 + ((v + 0x8000) >> 16); /* lis r11,sym@ha */ + ip[1] = 0x396b0000 + (v & 0xffff); /* addi r11,r11,sym@l */ + ip[2] = 0x7d6903a6; /* mtctr r11 */ + ip[3] = 0x4e800420; /* bctr */ +#endif pe->inited = 1; } @@ -775,15 +877,18 @@ arch_apply_relocation(struct obj_file *f, if (v & 3) ret = obj_reloc_dangerous; + /* merge the offset into the instruction. */ +#if defined(__arm__) /* Convert to words. */ v >>= 2; - /* merge the offset into the instruction. */ *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff); - break; -#elif defined(__i386__) #endif - +#if defined(__powerpc__) + *loc = (*loc & ~0x03fffffc) | (v & 0x03fffffc); +#endif + break; +#endif /* BB_USE_PLT_ENTRIES */ #if defined(__arm__) #elif defined(__sh__) @@ -809,6 +914,8 @@ arch_apply_relocation(struct obj_file *f, break; #endif +#if defined(BB_USE_GOT_ENTRIES) + #if defined(__sh__) case R_SH_GOTPC: #elif defined(__arm__) @@ -827,7 +934,7 @@ arch_apply_relocation(struct obj_file *f, #if defined(__sh__) case R_SH_GOT32: #elif defined(__arm__) - case R_ARM_GOT32: + case R_ARM_GOT32: #elif defined(__i386__) case R_386_GOT32: #endif @@ -849,7 +956,7 @@ arch_apply_relocation(struct obj_file *f, #if defined(__sh__) case R_SH_GOTOFF: #elif defined(__arm__) - case R_ARM_GOTOFF: + case R_ARM_GOTOFF: #elif defined(__i386__) case R_386_GOTOFF: #endif @@ -857,6 +964,8 @@ arch_apply_relocation(struct obj_file *f, *loc += v - got; break; +#endif /* BB_USE_GOT_ENTRIES */ + default: printf("Warning: unhandled reloc %d\n",(int)ELF32_R_TYPE(rel->r_info)); ret = obj_reloc_unhandled; @@ -869,8 +978,11 @@ arch_apply_relocation(struct obj_file *f, int arch_create_got(struct obj_file *f) { struct arch_file *ifile = (struct arch_file *) f; - int i, got_offset = 0, gotneeded = 0; -#if defined(__arm__) + int i; +#if defined(BB_USE_GOT_ENTRIES) + int got_offset = 0, gotneeded = 0; +#endif +#if defined(BB_USE_PLT_ENTRIES) int plt_offset = 0, pltneeded = 0; #endif struct obj_section *relsec, *symsec, *strsec; @@ -898,12 +1010,20 @@ int arch_create_got(struct obj_file *f) switch (ELF32_R_TYPE(rel->r_info)) { #if defined(__arm__) case R_ARM_GOT32: + break; #elif defined(__sh__) case R_SH_GOT32: + break; #elif defined(__i386__) case R_386_GOT32: + break; #endif + +#if defined(__powerpc__) + case R_PPC_REL24: + pltneeded = 1; break; +#endif #if defined(__arm__) case R_ARM_PC24: @@ -936,17 +1056,18 @@ int arch_create_got(struct obj_file *f) name = f->sections[extsym->st_shndx]->name; } intsym = (struct arch_symbol *) obj_find_symbol(f, name); - +#if defined(BB_USE_GOT_ENTRIES) if (!intsym->gotent.offset_done) { intsym->gotent.offset_done = 1; intsym->gotent.offset = got_offset; - got_offset += 4; + got_offset += BB_GOT_ENTRY_SIZE; } -#if defined(__arm__) +#endif +#if defined(BB_USE_PLT_ENTRIES) if (pltneeded && intsym->pltent.allocated == 0) { intsym->pltent.allocated = 1; intsym->pltent.offset = plt_offset; - plt_offset += 8; + plt_offset += BB_PLT_ENTRY_SIZE; intsym->pltent.inited = 0; pltneeded = 0; } @@ -954,27 +1075,29 @@ int arch_create_got(struct obj_file *f) } } -#if defined(__arm__) +#if defined(BB_USE_GOT_ENTRIES) if (got_offset) { struct obj_section* relsec = obj_find_section(f, ".got"); if (relsec) { obj_extend_section(relsec, got_offset); } else { - relsec = obj_create_alloced_section(f, ".got", 8, got_offset); + relsec = obj_create_alloced_section(f, ".got", + BB_GOT_ENTRY_SIZE, + got_offset); assert(relsec); } ifile->got = relsec; } +#endif +#if defined(BB_USE_PLT_ENTRIES) if (plt_offset) - ifile->plt = obj_create_alloced_section(f, ".plt", 8, plt_offset); -#else - if (got_offset > 0 || gotneeded) - ifile->got = obj_create_alloced_section(f, ".got", 4, got_offset); + ifile->plt = obj_create_alloced_section(f, ".plt", + BB_PLT_ENTRY_SIZE, + plt_offset); #endif - return 1; } -- cgit v1.2.3