From: Vladimir 'phcoder' Serbinenko Date: Tue, 8 Nov 2011 10:23:56 +0000 (+0100) Subject: Support trampoline jumps on powerpc. X-Git-Tag: 2.00~1002 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ed64e9e27954718192e598d1f4bfaf0caba38152;p=thirdparty%2Fgrub.git Support trampoline jumps on powerpc. * grub-core/kern/dl.c (grub_dl_load_segments) [__powerpc__]: Follow __ia64__ path. (grub_dl_load_segments): Set mod->sz. (grub_dl_flush_cache): Flush whole space occupied by module, not just segments. * grub-core/kern/ia64/dl.c (nopm): Make const while on it. (jump): Likewise. * grub-core/kern/powerpc/dl.c (grub_arch_dl_get_tramp_got_size): New function. (trampoline): New struct. (trampoline_template): New const. (grub_arch_dl_relocate_symbols): Create trampolines on overflow. * include/grub/dl.h (grub_dl): Add sz element. [__powerpc__]: Follow __ia64__. (GRUB_ARCH_DL_TRAMP_ALIGN): Define on ppc. (GRUB_ARCH_DL_GOT_ALIGN): Likewise. (GRUB_ARCH_DL_TRAMP_SIZE): Likewise. (grub_arch_dl_get_tramp_got_size) [__powerpc__]: New proto. --- diff --git a/ChangeLog b/ChangeLog index 891126792..48799984d 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,26 @@ +2011-11-08 Vladimir Serbinenko + + Support trampoline jumps on powerpc. + + * grub-core/kern/dl.c (grub_dl_load_segments) [__powerpc__]: Follow + __ia64__ path. + (grub_dl_load_segments): Set mod->sz. + (grub_dl_flush_cache): Flush whole space occupied by module, not just + segments. + * grub-core/kern/ia64/dl.c (nopm): Make const while on it. + (jump): Likewise. + * grub-core/kern/powerpc/dl.c (grub_arch_dl_get_tramp_got_size): New + function. + (trampoline): New struct. + (trampoline_template): New const. + (grub_arch_dl_relocate_symbols): Create trampolines on overflow. + * include/grub/dl.h (grub_dl): Add sz element. + [__powerpc__]: Follow __ia64__. + (GRUB_ARCH_DL_TRAMP_ALIGN): Define on ppc. + (GRUB_ARCH_DL_GOT_ALIGN): Likewise. + (GRUB_ARCH_DL_TRAMP_SIZE): Likewise. + (grub_arch_dl_get_tramp_got_size) [__powerpc__]: New proto. + 2011-11-06 Vladimir Serbinenko ZFS crypto support. diff --git a/grub-core/kern/dl.c b/grub-core/kern/dl.c index 1841bf1f5..b6fb537e8 100644 --- a/grub-core/kern/dl.c +++ b/grub-core/kern/dl.c @@ -233,7 +233,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e) unsigned i; Elf_Shdr *s; grub_size_t tsize = 0, talign = 1; -#ifdef __ia64__ +#if defined (__ia64__) || defined (__powerpc__) grub_size_t tramp; grub_size_t got; #endif @@ -248,9 +248,9 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e) talign = s->sh_addralign; } -#ifdef __ia64__ +#if defined (__ia64__) || defined (__powerpc__) grub_arch_dl_get_tramp_got_size (e, &tramp, &got); - tramp *= GRUB_IA64_DL_TRAMP_SIZE; + tramp *= GRUB_ARCH_DL_TRAMP_SIZE; got *= sizeof (grub_uint64_t); tsize += ALIGN_UP (tramp, GRUB_ARCH_DL_TRAMP_ALIGN); if (talign < GRUB_ARCH_DL_TRAMP_ALIGN) @@ -269,6 +269,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e) mod->base = grub_memalign (talign, tsize); if (!mod->base) return grub_errno; + mod->sz = tsize; ptr = mod->base; #ifdef GRUB_MACHINE_EMU @@ -316,7 +317,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e) mod->segment = seg; } } -#ifdef __ia64__ +#if defined (__ia64__) || defined (__powerpc__) ptr = (char *) ALIGN_UP ((grub_addr_t) ptr, GRUB_ARCH_DL_TRAMP_ALIGN); mod->tramp = ptr; ptr += tramp; @@ -575,15 +576,9 @@ grub_dl_unref (grub_dl_t mod) static void grub_dl_flush_cache (grub_dl_t mod) { - grub_dl_segment_t seg; - - for (seg = mod->segment; seg; seg = seg->next) { - if (seg->size) { - grub_dprintf ("modules", "flushing 0x%lx bytes at %p\n", - (unsigned long) seg->size, seg->addr); - grub_arch_sync_caches (seg->addr, seg->size); - } - } + grub_dprintf ("modules", "flushing 0x%lx bytes at %p\n", + (unsigned long) mod->sz, mod->base); + grub_arch_sync_caches (mod->base, mod->sz); } /* Load a module from core memory. */ diff --git a/grub-core/kern/ia64/dl.c b/grub-core/kern/ia64/dl.c index 3904f73b7..31b5f94cf 100644 --- a/grub-core/kern/ia64/dl.c +++ b/grub-core/kern/ia64/dl.c @@ -104,13 +104,13 @@ add_value_to_slot_21 (grub_addr_t addr, grub_uint32_t value) } } -static grub_uint8_t nopm[5] = +static const grub_uint8_t nopm[5] = { /* [MLX] nop.m 0x0 */ 0x05, 0x00, 0x00, 0x00, 0x01 }; -static grub_uint8_t jump[0x20] = +static const grub_uint8_t jump[0x20] = { /* ld8 r16=[r15],8 */ 0x02, 0x80, 0x20, 0x1e, 0x18, 0x14, diff --git a/grub-core/kern/powerpc/dl.c b/grub-core/kern/powerpc/dl.c index ad19e5600..34e780a45 100644 --- a/grub-core/kern/powerpc/dl.c +++ b/grub-core/kern/powerpc/dl.c @@ -37,6 +37,65 @@ grub_arch_dl_check_header (void *ehdr) return GRUB_ERR_NONE; } +void +grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp, + grub_size_t *got) +{ + const Elf_Ehdr *e = ehdr; + const Elf_Shdr *s; + Elf_Word entsize; + unsigned i; + + *tramp = 0; + *got = 0; + + /* Find a symbol table. */ + for (i = 0, s = (const Elf_Shdr *) ((const char *) e + e->e_shoff); + i < e->e_shnum; + i++, s = (const Elf_Shdr *) ((const char *) s + e->e_shentsize)) + if (s->sh_type == SHT_SYMTAB) + break; + + if (i == e->e_shnum) + return; + + entsize = s->sh_entsize; + + for (i = 0, s = (const Elf_Shdr *) ((const char *) e + e->e_shoff); + i < e->e_shnum; + i++, s = (const Elf_Shdr *) ((const char *) s + e->e_shentsize)) + if (s->sh_type == SHT_RELA) + { + const Elf_Rela *rel, *max; + + for (rel = (const Elf_Rela *) ((const char *) e + s->sh_offset), + max = rel + s->sh_size / s->sh_entsize; + rel < max; + rel++) + if (ELF_R_TYPE (rel->r_info) == R_PPC_REL24) + (*tramp)++; + + } + + return; +} + +/* For low-endian reverse lis and addr_high as well as ori and addr_low. */ +struct trampoline +{ + grub_uint32_t lis; + grub_uint32_t ori; + grub_uint32_t mtctr; + grub_uint32_t bctr; +}; + +static const struct trampoline trampoline_template = + { + 0x3c000000, + 0x60000000, + 0x7c0903a6, + 0x4e800420, + }; /* Relocate symbols. */ grub_err_t @@ -46,6 +105,7 @@ grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr) Elf_Shdr *s; Elf_Word entsize; unsigned i; + struct trampoline *tptr = mod->tramp; /* Find a symbol table. */ for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff); @@ -106,7 +166,20 @@ grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr) Elf_Sword delta = value - (Elf_Word) addr; if (delta << 6 >> 6 != delta) - return grub_error (GRUB_ERR_BAD_MODULE, "relocation overflow"); + { + COMPILE_TIME_ASSERT (sizeof (struct trampoline) + == GRUB_ARCH_DL_TRAMP_SIZE); + grub_memcpy (tptr, &trampoline_template, + sizeof (*tptr)); + delta = (grub_uint8_t *) tptr - (grub_uint8_t *) addr; + tptr->lis |= (((value) >> 16) & 0xffff); + tptr->ori |= ((value) & 0xffff); + tptr++; + } + + if (delta << 6 >> 6 != delta) + return grub_error (GRUB_ERR_BAD_MODULE, + "relocation overflow"); *addr = (*addr & 0xfc000003) | (delta & 0x3fffffc); break; } diff --git a/include/grub/dl.h b/include/grub/dl.h index 75cd71758..886e966cc 100644 --- a/include/grub/dl.h +++ b/include/grub/dl.h @@ -136,11 +136,12 @@ struct grub_dl Elf_Sym *symtab; void (*init) (struct grub_dl *mod); void (*fini) (void); -#ifdef __ia64__ +#if defined (__ia64__) || defined (__powerpc__) void *got; void *tramp; #endif void *base; + grub_size_t sz; struct grub_dl *next; }; typedef struct grub_dl *grub_dl_t; @@ -176,10 +177,20 @@ void grub_ia64_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp, grub_size_t *got); -#ifdef __ia64__ +#if defined (__ia64__) #define GRUB_ARCH_DL_TRAMP_ALIGN 16 #define GRUB_ARCH_DL_GOT_ALIGN 16 #define grub_arch_dl_get_tramp_got_size grub_ia64_dl_get_tramp_got_size +#else +void +grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp, + grub_size_t *got); +#endif + +#ifdef __powerpc__ +#define GRUB_ARCH_DL_TRAMP_SIZE 16 +#define GRUB_ARCH_DL_TRAMP_ALIGN 4 +#define GRUB_ARCH_DL_GOT_ALIGN 4 #endif #endif