WSL2-Linux-Kernel/include/asm-x86/calling.h

/*
 * 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