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Handle unaligned .bss on sparc64.

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Current code improperly assumes that both __bss_start and _end are
	aligned to 8-bytes. Eliminating this assumption and explicitly align
	modules.
This commit is contained in:
Vladimir Serbinenko 2013-12-04 20:05:24 +01:00
parent 4a73746a04
commit e5ed2f6947
5 changed files with 49 additions and 10 deletions
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34
grub-core/kern/sparc64/ieee1275/crt0.S
View file

@ -36,10 +36,14 @@ codestart:
/* Copy the modules past the end of the kernel image.
* They are currently sitting in the BSS.
*/
sethi %hi(__bss_start), %o2
or %o2, %lo(__bss_start), %o2
sethi %hi(_end), %o3
or %o3, %lo(_end), %o3
sethi %hi(__bss_start + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o2
or %o2, %lo(__bss_start + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o2
srl %o2, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o2
sll %o2, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o2
sethi %hi(_end + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o3
or %o3, %lo(_end + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o3
srl %o3, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o3
sll %o3, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o3
sethi %hi(grub_total_module_size), %o4
lduw [%o4 + %lo(grub_total_module_size)], %o4
@ -67,16 +71,34 @@ codestart:
/* Now it's safe to clear out the BSS. */
sethi %hi(__bss_start), %o2
or %o2, %lo(__bss_start), %o2
sethi %hi(_end), %o3
or %o3, %lo(_end), %o3
1: stb %g0, [%o2]
add %o2, 1, %o2
and %o2, 7, %o3
brnz %o3, 1b
nop
sethi %hi(_end - 1), %o3
or %o3, %lo(_end - 1), %o3
srl %o3, 3, %o3
sll %o3, 3, %o3
1: stx %g0, [%o2]
add %o2, 8, %o2
cmp %o2, %o3
blt,pt %xcc, 1b
nop
sethi %hi(_end), %o3
or %o3, %lo(_end), %o3
1: stb %g0, [%o2]
add %o2, 1, %o2
cmp %o2, %o3
blt,pt %xcc, 1b
nop
sethi %hi(grub_ieee1275_original_stack), %o2
stx %o1, [%o2 + %lo(grub_ieee1275_original_stack)]
sethi %hi(grub_ieee1275_entry_fn), %o2
call grub_main
stx %o0, [%o2 + %lo(grub_ieee1275_entry_fn)]
1: ba,a 1b
nop