1 files changed, 170 insertions, 0 deletions

diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h
new file mode 100644
index 000000000000..2bc162e0ec6e
--- /dev/null
+++ b/arch/x86/include/asm/calling.h
@@ -0,0 +1,170 @@
+/*
+ * Some macros to handle stack frames in assembly.
+ */
+
+#define R15               0
+#define R14               8
+#define R13              16
+#define R12              24
+#define RBP              32
+#define RBX              40
+
+/* arguments: interrupts/non tracing syscalls only save upto here*/
+#define R11              48
+#define R10              56
+#define R9               64
+#define R8               72
+#define RAX              80
+#define RCX              88
+#define RDX              96
+#define RSI             104
+#define RDI             112
+#define ORIG_RAX        120       /* + error_code */
+/* end of arguments */
+
+/* cpu exception frame or undefined in case of fast syscall. */
+#define RIP             128
+#define CS              136
+#define EFLAGS          144
+#define RSP             152
+#define SS              160
+
+#define ARGOFFSET       R11
+#define SWFRAME         ORIG_RAX
+
+        .macro SAVE_ARGS addskip=0, norcx=0, nor891011=0
+        subq  $9*8+\addskip, %rsp
+        CFI_ADJUST_CFA_OFFSET   9*8+\addskip
+        movq  %rdi, 8*8(%rsp)
+        CFI_REL_OFFSET  rdi, 8*8
+        movq  %rsi, 7*8(%rsp)
+        CFI_REL_OFFSET  rsi, 7*8
+        movq  %rdx, 6*8(%rsp)
+        CFI_REL_OFFSET  rdx, 6*8
+        .if \norcx
+        .else
+        movq  %rcx, 5*8(%rsp)
+        CFI_REL_OFFSET  rcx, 5*8
+        .endif
+        movq  %rax, 4*8(%rsp)
+        CFI_REL_OFFSET  rax, 4*8
+        .if \nor891011
+        .else
+        movq  %r8, 3*8(%rsp)
+        CFI_REL_OFFSET  r8,  3*8
+        movq  %r9, 2*8(%rsp)
+        CFI_REL_OFFSET  r9,  2*8
+        movq  %r10, 1*8(%rsp)
+        CFI_REL_OFFSET  r10, 1*8
+        movq  %r11, (%rsp)
+        CFI_REL_OFFSET  r11, 0*8
+        .endif
+        .endm
+
+#define ARG_SKIP        9*8
+
+        .macro RESTORE_ARGS skiprax=0, addskip=0, skiprcx=0, skipr11=0, \
+                            skipr8910=0, skiprdx=0
+        .if \skipr11
+        .else
+        movq (%rsp), %r11
+        CFI_RESTORE r11
+        .endif
+        .if \skipr8910
+        .else
+        movq 1*8(%rsp), %r10
+        CFI_RESTORE r10
+        movq 2*8(%rsp), %r9
+        CFI_RESTORE r9
+        movq 3*8(%rsp), %r8
+        CFI_RESTORE r8
+        .endif
+        .if \skiprax
+        .else
+        movq 4*8(%rsp), %rax
+        CFI_RESTORE rax
+        .endif
+        .if \skiprcx
+        .else
+        movq 5*8(%rsp), %rcx
+        CFI_RESTORE rcx
+        .endif
+        .if \skiprdx
+        .else
+        movq 6*8(%rsp), %rdx
+        CFI_RESTORE rdx
+        .endif
+        movq 7*8(%rsp), %rsi
+        CFI_RESTORE rsi
+        movq 8*8(%rsp), %rdi
+        CFI_RESTORE rdi
+        .if ARG_SKIP+\addskip > 0
+        addq $ARG_SKIP+\addskip, %rsp
+        CFI_ADJUST_CFA_OFFSET   -(ARG_SKIP+\addskip)
+        .endif
+        .endm
+
+        .macro LOAD_ARGS offset, skiprax=0
+        movq \offset(%rsp),    %r11
+        movq \offset+8(%rsp),  %r10
+        movq \offset+16(%rsp), %r9
+        movq \offset+24(%rsp), %r8
+        movq \offset+40(%rsp), %rcx
+        movq \offset+48(%rsp), %rdx
+        movq \offset+56(%rsp), %rsi
+        movq \offset+64(%rsp), %rdi
+        .if \skiprax
+        .else
+        movq \offset+72(%rsp), %rax
+        .endif
+        .endm
+
+#define REST_SKIP       6*8
+
+        .macro SAVE_REST
+        subq $REST_SKIP, %rsp
+        CFI_ADJUST_CFA_OFFSET   REST_SKIP
+        movq %rbx, 5*8(%rsp)
+        CFI_REL_OFFSET  rbx, 5*8
+        movq %rbp, 4*8(%rsp)
+        CFI_REL_OFFSET  rbp, 4*8
+        movq %r12, 3*8(%rsp)
+        CFI_REL_OFFSET  r12, 3*8
+        movq %r13, 2*8(%rsp)
+        CFI_REL_OFFSET  r13, 2*8
+        movq %r14, 1*8(%rsp)
+        CFI_REL_OFFSET  r14, 1*8
+        movq %r15, (%rsp)
+        CFI_REL_OFFSET  r15, 0*8
+        .endm
+
+        .macro RESTORE_REST
+        movq (%rsp),     %r15
+        CFI_RESTORE r15
+        movq 1*8(%rsp),  %r14
+        CFI_RESTORE r14
+        movq 2*8(%rsp),  %r13
+        CFI_RESTORE r13
+        movq 3*8(%rsp),  %r12
+        CFI_RESTORE r12
+        movq 4*8(%rsp),  %rbp
+        CFI_RESTORE rbp
+        movq 5*8(%rsp),  %rbx
+        CFI_RESTORE rbx
+        addq $REST_SKIP, %rsp
+        CFI_ADJUST_CFA_OFFSET   -(REST_SKIP)
+        .endm
+
+        .macro SAVE_ALL
+        SAVE_ARGS
+        SAVE_REST
+        .endm
+
+        .macro RESTORE_ALL addskip=0
+        RESTORE_REST
+        RESTORE_ARGS 0, \addskip
+        .endm
+
+        .macro icebp
+        .byte 0xf1
+        .endm