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Actually sub esp, 32 is only 3 bytes long, so undo some of the pop rax changes.

This commit is contained in:
Andrius Štikonas 2022-07-17 13:53:31 +01:00
parent bfb164eb68
commit 85e3b0caef
1 changed files with 4 additions and 16 deletions
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20
amd64/Development/hex0.S
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@ -37,10 +37,7 @@ _start:
push 0 # arg5 = NULL
mov r9, rcx # arg4 = image_handle
# arg1 = ImageHandle (already set)
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
sub esp, 32 # allocate shadow stack space for UEFI function
call r14 # system->boot->open_protocol(image_handle, &guid, &image, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
mov rax, [rsp+64] # get image
@ -79,10 +76,7 @@ loop_options2: # Skip argv[1]
push 0 # arg5 = NULL
mov r9, r15 # arg4 = image_handle
mov rcx, [rcx+24] # arg1 = root_device = image->device
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
sub esp, 32 # allocate shadow stack space for UEFI function
call r14 # system->boot->open_protocol(root_device, &guid, &rootfs, image_handle, 0, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
mov rcx, [rsp+64] # get rootfs
@ -106,10 +100,7 @@ loop_options2: # Skip argv[1]
mov r8, r13 # arg3 = out
mov rcx, r14 # arg1 = rootdir
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
sub esp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
mov r13, [rsp+40] # get fout
@ -121,10 +112,7 @@ loop_options2: # Skip argv[1]
pop r9 # arg4 = EFI_FILE_MODE_READ
mov r8, r12 # arg3 = in
mov rcx, r14 # arg1 = rootdir
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
push rax # allocate shadow stack space for UEFI function
sub esp, 32 # allocate shadow stack space for UEFI function
call [rcx+8] # rootdir->open()
mov r12, [rsp+40] # get fin