[PATCH v3 04/17] x86/compressed: efi-mixed: move efi32_pe_entry into .text section

From: Ard Biesheuvel
Date: Tue Nov 22 2022 - 11:11:10 EST


Move efi32_pe_entry() into the .text section, so that it can be moved
out of head_64.S and into a separate compilation unit in a subsequent
patch.

Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
arch/x86/boot/compressed/head_64.S | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index b9dbc8127038c315..8192ab1c308567ce 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -778,7 +778,7 @@ SYM_DATA(efi_is64, .byte 1)
#define BS32_handle_protocol 88 // offsetof(efi_boot_services_32_t, handle_protocol)
#define LI32_image_base 32 // offsetof(efi_loaded_image_32_t, image_base)

- __HEAD
+ .text
.code32
SYM_FUNC_START(efi32_pe_entry)
/*
@@ -800,12 +800,11 @@ SYM_FUNC_START(efi32_pe_entry)

call 1f
1: pop %ebx
- subl $ rva(1b), %ebx

/* Get the loaded image protocol pointer from the image handle */
leal -4(%ebp), %eax
pushl %eax // &loaded_image
- leal rva(loaded_image_proto)(%ebx), %eax
+ leal (loaded_image_proto - 1b)(%ebx), %eax
pushl %eax // pass the GUID address
pushl 8(%ebp) // pass the image handle

@@ -834,13 +833,13 @@ SYM_FUNC_START(efi32_pe_entry)
movl 12(%ebp), %edx // sys_table
movl -4(%ebp), %esi // loaded_image
movl LI32_image_base(%esi), %esi // loaded_image->image_base
- movl %ebx, %ebp // startup_32 for efi32_pe_stub_entry
+ leal (startup_32 - 1b)(%ebx), %ebp // runtime address of startup_32
/*
* We need to set the image_offset variable here since startup_32() will
* use it before we get to the 64-bit efi_pe_entry() in C code.
*/
- subl %esi, %ebx
- movl %ebx, rva(image_offset)(%ebp) // save image_offset
+ subl %esi, %ebp // calculate image_offset
+ movl %ebp, (image_offset - 1b)(%ebx) // save image_offset
xorl %esi, %esi
jmp efi32_entry // pass %ecx, %edx, %esi
// no other registers remain live
--
2.35.1