x86/boot/32: Extract efi_pe_entry() from startup_32()
The efi_pe_entry() body is somehow squashed into startup_32(). In the old days,
we forced startup_32() to start at offset 0x00 and efi_pe_entry() to start
at 0x10.
But this requirement was removed long time ago, in:
99f857db88 ("x86, build: Dynamically find entry points in compressed startup code")
The way it is now makes the code less readable and illogical. Given
we can now safely extract the inlined efi_pe_entry() body from
startup_32() into a separate function, we do so and we separate it to two
functions as they are marked already: efi_pe_entry() + efi32_stub_entry().
We also annotate the functions appropriatelly by ENTRY+ENDPROC.
ABI offset is preserved:
0000 128 FUNC GLOBAL DEFAULT 6 startup_32
0080 60 FUNC GLOBAL DEFAULT 6 efi_pe_entry
00bc 68 FUNC GLOBAL DEFAULT 6 efi32_stub_entry
On the top-level, it looked like this:
ENTRY(startup_32)
#ifdef CONFIG_EFI_STUB ; start of inlined
jmp preferred_addr
ENTRY(efi_pe_entry)
... ; a lot of assembly (efi_pe_entry)
ENTRY(efi32_stub_entry)
... ; a lot of assembly (efi32_stub_entry)
leal preferred_addr(%eax), %eax
jmp *%eax
preferred_addr:
#endif ; end of inlined
... ; a lot of assembly (startup_32)
ENDPROC(startup_32)
And it is now converted into:
ENTRY(startup_32)
... ; a lot of assembly (startup_32)
ENDPROC(startup_32)
#ifdef CONFIG_EFI_STUB
ENTRY(efi_pe_entry)
... ; a lot of assembly (efi_pe_entry)
ENDPROC(efi_pe_entry)
ENTRY(efi32_stub_entry)
... ; a lot of assembly (efi32_stub_entry)
leal startup_32(%eax), %eax
jmp *%eax
ENDPROC(efi32_stub_entry)
#endif
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: ard.biesheuvel@linaro.org
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170824073327.4129-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jiri Slaby
Ingo Molnar
parent
ecda85e702
commit
f4dee0bb65
|
|
@ -61,71 +61,6 @@
|
|||
|
||||
__HEAD
|
||||
ENTRY(startup_32)
|
||||
#ifdef CONFIG_EFI_STUB
|
||||
jmp preferred_addr
|
||||
|
||||
/*
|
||||
* We don't need the return address, so set up the stack so
|
||||
* efi_main() can find its arguments.
|
||||
*/
|
||||
ENTRY(efi_pe_entry)
|
||||
add $0x4, %esp
|
||||
|
||||
call 1f
|
||||
1: popl %esi
|
||||
subl $1b, %esi
|
||||
|
||||
popl %ecx
|
||||
movl %ecx, efi32_config(%esi) /* Handle */
|
||||
popl %ecx
|
||||
movl %ecx, efi32_config+8(%esi) /* EFI System table pointer */
|
||||
|
||||
/* Relocate efi_config->call() */
|
||||
leal efi32_config(%esi), %eax
|
||||
add %esi, 40(%eax)
|
||||
pushl %eax
|
||||
|
||||
call make_boot_params
|
||||
cmpl $0, %eax
|
||||
je fail
|
||||
movl %esi, BP_code32_start(%eax)
|
||||
popl %ecx
|
||||
pushl %eax
|
||||
pushl %ecx
|
||||
jmp 2f /* Skip efi_config initialization */
|
||||
|
||||
ENTRY(efi32_stub_entry)
|
||||
add $0x4, %esp
|
||||
popl %ecx
|
||||
popl %edx
|
||||
|
||||
call 1f
|
||||
1: popl %esi
|
||||
subl $1b, %esi
|
||||
|
||||
movl %ecx, efi32_config(%esi) /* Handle */
|
||||
movl %edx, efi32_config+8(%esi) /* EFI System table pointer */
|
||||
|
||||
/* Relocate efi_config->call() */
|
||||
leal efi32_config(%esi), %eax
|
||||
add %esi, 40(%eax)
|
||||
pushl %eax
|
||||
2:
|
||||
call efi_main
|
||||
cmpl $0, %eax
|
||||
movl %eax, %esi
|
||||
jne 2f
|
||||
fail:
|
||||
/* EFI init failed, so hang. */
|
||||
hlt
|
||||
jmp fail
|
||||
2:
|
||||
movl BP_code32_start(%esi), %eax
|
||||
leal preferred_addr(%eax), %eax
|
||||
jmp *%eax
|
||||
|
||||
preferred_addr:
|
||||
#endif
|
||||
cld
|
||||
/*
|
||||
* Test KEEP_SEGMENTS flag to see if the bootloader is asking
|
||||
|
|
@ -208,6 +143,70 @@ preferred_addr:
|
|||
jmp *%eax
|
||||
ENDPROC(startup_32)
|
||||
|
||||
#ifdef CONFIG_EFI_STUB
|
||||
/*
|
||||
* We don't need the return address, so set up the stack so efi_main() can find
|
||||
* its arguments.
|
||||
*/
|
||||
ENTRY(efi_pe_entry)
|
||||
add $0x4, %esp
|
||||
|
||||
call 1f
|
||||
1: popl %esi
|
||||
subl $1b, %esi
|
||||
|
||||
popl %ecx
|
||||
movl %ecx, efi32_config(%esi) /* Handle */
|
||||
popl %ecx
|
||||
movl %ecx, efi32_config+8(%esi) /* EFI System table pointer */
|
||||
|
||||
/* Relocate efi_config->call() */
|
||||
leal efi32_config(%esi), %eax
|
||||
add %esi, 40(%eax)
|
||||
pushl %eax
|
||||
|
||||
call make_boot_params
|
||||
cmpl $0, %eax
|
||||
je fail
|
||||
movl %esi, BP_code32_start(%eax)
|
||||
popl %ecx
|
||||
pushl %eax
|
||||
pushl %ecx
|
||||
jmp 2f /* Skip efi_config initialization */
|
||||
ENDPROC(efi_pe_entry)
|
||||
|
||||
ENTRY(efi32_stub_entry)
|
||||
add $0x4, %esp
|
||||
popl %ecx
|
||||
popl %edx
|
||||
|
||||
call 1f
|
||||
1: popl %esi
|
||||
subl $1b, %esi
|
||||
|
||||
movl %ecx, efi32_config(%esi) /* Handle */
|
||||
movl %edx, efi32_config+8(%esi) /* EFI System table pointer */
|
||||
|
||||
/* Relocate efi_config->call() */
|
||||
leal efi32_config(%esi), %eax
|
||||
add %esi, 40(%eax)
|
||||
pushl %eax
|
||||
2:
|
||||
call efi_main
|
||||
cmpl $0, %eax
|
||||
movl %eax, %esi
|
||||
jne 2f
|
||||
fail:
|
||||
/* EFI init failed, so hang. */
|
||||
hlt
|
||||
jmp fail
|
||||
2:
|
||||
movl BP_code32_start(%esi), %eax
|
||||
leal startup_32(%eax), %eax
|
||||
jmp *%eax
|
||||
ENDPROC(efi32_stub_entry)
|
||||
#endif
|
||||
|
||||
.text
|
||||
relocated:
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue