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Implement sparc64 trampolines (needed for sparc64-emu).

This commit is contained in:
Vladimir Serbinenko 2013-12-10 00:01:27 +01:00
parent 21eee750b7
commit 7a148da6dd
5 changed files with 76 additions and 6 deletions
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4
ChangeLog
View File

@ -1,3 +1,7 @@
2013-12-09 Vladimir Serbinenko <phcoder@gmail.com>
Implement sparc64 trampolines (needed for sparc64-emu).
2013-12-09 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/kern/sparc64/dl.c (grub_arch_dl_relocate_symbols): Check

6
grub-core/kern/dl.c
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@ -225,7 +225,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
unsigned i;
Elf_Shdr *s;
grub_size_t tsize = 0, talign = 1;
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
#if !defined (__i386__) && !defined (__x86_64__)
grub_size_t tramp;
grub_size_t got;
grub_err_t err;
@ -241,7 +241,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
talign = s->sh_addralign;
}
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
#if !defined (__i386__) && !defined (__x86_64__)
err = grub_arch_dl_get_tramp_got_size (e, &tramp, &got);
if (err)
return err;
@ -304,7 +304,7 @@ grub_dl_load_segments (grub_dl_t mod, const Elf_Ehdr *e)
mod->segment = seg;
}
}
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
#if !defined (__i386__) && !defined (__x86_64__)
ptr = (char *) ALIGN_UP ((grub_addr_t) ptr, GRUB_ARCH_DL_TRAMP_ALIGN);
mod->tramp = ptr;
mod->trampptr = ptr;

2
grub-core/kern/emu/full.c
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@ -49,7 +49,7 @@ grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
return GRUB_ERR_BAD_MODULE;
}
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
#if !defined (__i386__) && !defined (__x86_64__)
grub_err_t
grub_arch_dl_get_tramp_got_size (const void *ehdr __attribute__ ((unused)),
grub_size_t *tramp, grub_size_t *got)

66
grub-core/kern/sparc64/dl.c
View File

@ -40,6 +40,61 @@ grub_arch_dl_check_header (void *ehdr)
#pragma GCC diagnostic ignored "-Wcast-align"
struct trampoline
{
grub_uint8_t code[0x28];
grub_uint64_t addr;
};
static const grub_uint8_t trampoline_code[0x28] =
{
/* 0: */ 0x82, 0x10, 0x00, 0x0f, /* mov %o7, %g1 */
/* 4: */ 0x40, 0x00, 0x00, 0x02, /* call 0xc */
/* 8: */ 0x01, 0x00, 0x00, 0x00, /* nop */
/* c: */ 0x9e, 0x1b, 0xc0, 0x01, /* xor %o7, %g1, %o7 */
/* 10: */ 0x82, 0x18, 0x40, 0x0f, /* xor %g1, %o7, %g1 */
/* 14: */ 0x9e, 0x1b, 0xc0, 0x01, /* xor %o7, %g1, %o7 */
/* 18: */ 0xc2, 0x58, 0x60, 0x24, /* ldx [ %g1 + 0x24 ], %g1 */
/* 1c: */ 0x81, 0xc0, 0x40, 0x00, /* jmp %g1 */
/* 20: */ 0x01, 0x00, 0x00, 0x00, /* nop */
/* 24: */ 0x01, 0x00, 0x00, 0x00, /* nop */
};
grub_err_t
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;
unsigned i;
*tramp = 0;
*got = 0;
for (i = 0, s = (const Elf_Shdr *) ((grub_addr_t) e + e->e_shoff);
i < e->e_shnum;
i++, s = (const Elf_Shdr *) ((grub_addr_t) s + e->e_shentsize))
if (s->sh_type == SHT_REL || s->sh_type == SHT_RELA)
{
const Elf_Rel *rel, *max;
for (rel = (const Elf_Rel *) ((grub_addr_t) e + s->sh_offset),
max = rel + s->sh_size / s->sh_entsize;
rel < max;
rel = (const Elf_Rel *) ((grub_addr_t) rel + s->sh_entsize))
switch (ELF_R_TYPE (rel->r_info))
{
case R_SPARC_WDISP30:
{
*tramp += sizeof (struct trampoline);
break;
}
}
}
return GRUB_ERR_NONE;
}
/* Relocate symbols. */
grub_err_t
grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
@ -74,6 +129,17 @@ grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
*addr = value;
break;
case R_SPARC_WDISP30: /* 7 V-disp30 */
if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
(((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
!= 0xFFFFFFFF00000000))
{
struct trampoline *tp = mod->trampptr;
mod->trampptr = tp + 1;
grub_memcpy (tp->code, trampoline_code, sizeof (tp->code));
tp->addr = value;
value = (Elf_Addr) tp;
}
if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
(((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
!= 0xFFFFFFFF00000000))

4
include/grub/dl.h
View File

@ -180,7 +180,7 @@ struct grub_dl
grub_size_t symsize;
void (*init) (struct grub_dl *mod);
void (*fini) (void);
#if !defined (__i386__) && !defined (__x86_64__) && !defined (__sparc__)
#if !defined (__i386__) && !defined (__x86_64__)
void *got;
void *gotptr;
void *tramp;
@ -278,7 +278,7 @@ grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp,
#define GRUB_ARCH_DL_GOT_ALIGN 4
#endif
#if defined (__aarch64__)
#if defined (__aarch64__) || defined (__sparc__)
#define GRUB_ARCH_DL_TRAMP_ALIGN 8
#define GRUB_ARCH_DL_GOT_ALIGN 8
#endif