In EFI calling convention, %xmm0 - %xmm5 are specified as the scratch
registers (UEFI Specification 2.1, 2.3.4.2). To conforms to EFI
specification, this patch save/restore %xmm0 - %xmm5 registers
before/after invoking EFI runtime service. At the same time, the stack
is aligned in 16 bytes, and TS in CR0 in clear/restore to make it
possible to use SSE2 in EFI runtime service.
This patch is based on 2.6.24-rc4-mm1. And it has been tested on Intel
platforms with 64-bit UEFI 2.0 firmware.
Signed-off-by: Huang Ying <[EMAIL PROTECTED]>
---
arch/x86/kernel/efi_stub_64.S | 71 +++++++++++++++++++++++++++++++++---------
1 file changed, 56 insertions(+), 15 deletions(-)
--- a/arch/x86/kernel/efi_stub_64.S
+++ b/arch/x86/kernel/efi_stub_64.S
@@ -8,61 +8,102 @@
#include <linux/linkage.h>
+#define SAVE_XMM \
+ mov %rsp, %rax; \
+ subq $0x70, %rsp; \
+ and $~0xf, %rsp; \
+ mov %rax, (%rsp); \
+ mov %cr0, %rax; \
+ clts; \
+ mov %rax, 0x8(%rsp); \
+ movaps %xmm0, 0x60(%rsp); \
+ movaps %xmm1, 0x50(%rsp); \
+ movaps %xmm2, 0x40(%rsp); \
+ movaps %xmm3, 0x30(%rsp); \
+ movaps %xmm4, 0x20(%rsp); \
+ movaps %xmm5, 0x10(%rsp)
+
+#define RESTORE_XMM \
+ movaps 0x60(%rsp), %xmm0; \
+ movaps 0x50(%rsp), %xmm1; \
+ movaps 0x40(%rsp), %xmm2; \
+ movaps 0x30(%rsp), %xmm3; \
+ movaps 0x20(%rsp), %xmm4; \
+ movaps 0x10(%rsp), %xmm5; \
+ mov 0x8(%rsp), %rsi; \
+ mov %rsi, %cr0; \
+ mov (%rsp), %rsp
+
ENTRY(efi_call0)
- subq $40, %rsp
+ SAVE_XMM
+ subq $32, %rsp
call *%rdi
- addq $40, %rsp
+ addq $32, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call1)
- subq $40, %rsp
+ SAVE_XMM
+ subq $32, %rsp
mov %rsi, %rcx
call *%rdi
- addq $40, %rsp
+ addq $32, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call2)
- subq $40, %rsp
+ SAVE_XMM
+ subq $32, %rsp
mov %rsi, %rcx
call *%rdi
- addq $40, %rsp
+ addq $32, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call3)
- subq $40, %rsp
+ SAVE_XMM
+ subq $32, %rsp
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
- addq $40, %rsp
+ addq $32, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call4)
- subq $40, %rsp
+ SAVE_XMM
+ subq $32, %rsp
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
- addq $40, %rsp
+ addq $32, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call5)
- subq $40, %rsp
+ SAVE_XMM
+ subq $48, %rsp
mov %r9, 32(%rsp)
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
- addq $40, %rsp
+ addq $48, %rsp
+ RESTORE_XMM
ret
ENTRY(efi_call6)
- subq $56, %rsp
- mov 56+8(%rsp), %rax
+ SAVE_XMM
+ mov (%rsp), %rax
+ mov 8(%rax), %rax
+ subq $48, %rsp
mov %r9, 32(%rsp)
mov %rax, 40(%rsp)
mov %r8, %r9
mov %rcx, %r8
mov %rsi, %rcx
call *%rdi
- addq $56, %rsp
+ addq $48, %rsp
+ RESTORE_XMM
ret
--
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