x86, um: ... and asm-x86 move

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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 0000000..2bc162e
--- /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