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frameasm.h revision 1.26 
      1 /*	$NetBSD: frameasm.h,v 1.26 2018/01/07 13:43:23 maxv Exp $	*/
      2 
      3 #ifndef _AMD64_MACHINE_FRAMEASM_H
      4 #define _AMD64_MACHINE_FRAMEASM_H
      5 
      6 #ifdef _KERNEL_OPT
      7 #include "opt_xen.h"
      8 #endif
      9 
     10 /*
     11  * Macros to define pushing/popping frames for interrupts, traps
     12  * and system calls. Currently all the same; will diverge later.
     13  */
     14 
     15 #ifdef XEN
     16 #define HYPERVISOR_iret hypercall_page + (__HYPERVISOR_iret * 32)
     17 /* Xen do not need swapgs, done by hypervisor */
     18 #define swapgs
     19 #define iretq	pushq $0 ; jmp HYPERVISOR_iret
     20 #define	XEN_ONLY2(x,y)	x,y
     21 #define	NOT_XEN(x)
     22 
     23 #define CLI(temp_reg) \
     24  	movq CPUVAR(VCPU),%r ## temp_reg ;			\
     25 	movb $1,EVTCHN_UPCALL_MASK(%r ## temp_reg);
     26 
     27 #define STI(temp_reg) \
     28  	movq CPUVAR(VCPU),%r ## temp_reg ;			\
     29 	movb $0,EVTCHN_UPCALL_MASK(%r ## temp_reg);
     30 
     31 #else /* XEN */
     32 #define	XEN_ONLY2(x,y)
     33 #define	NOT_XEN(x)	x
     34 #define CLI(temp_reg) cli
     35 #define STI(temp_reg) sti
     36 #endif	/* XEN */
     37 
     38 #define HP_NAME_CLAC		1
     39 #define HP_NAME_STAC		2
     40 #define HP_NAME_NOLOCK		3
     41 #define HP_NAME_RETFENCE	4
     42 
     43 #define HOTPATCH(name, size) \
     44 123:						; \
     45 	.section	.rodata.hotpatch, "a"	; \
     46 	.byte		name			; \
     47 	.byte		size			; \
     48 	.quad		123b			; \
     49 	.previous
     50 
     51 #define SMAP_ENABLE \
     52 	HOTPATCH(HP_NAME_CLAC, 3)		; \
     53 	.byte 0x0F, 0x1F, 0x00			; \
     54 
     55 #define SMAP_DISABLE \
     56 	HOTPATCH(HP_NAME_STAC, 3)		; \
     57 	.byte 0x0F, 0x1F, 0x00			; \
     58 
     59 #define	SWAPGS	NOT_XEN(swapgs)
     60 
     61 /*
     62  * These are used on interrupt or trap entry or exit.
     63  */
     64 #define INTR_SAVE_GPRS \
     65 	movq	%rdi,TF_RDI(%rsp)	; \
     66 	movq	%rsi,TF_RSI(%rsp)	; \
     67 	movq	%rdx,TF_RDX(%rsp)	; \
     68 	movq	%rcx,TF_RCX(%rsp)	; \
     69 	movq	%r8,TF_R8(%rsp)		; \
     70 	movq	%r9,TF_R9(%rsp)		; \
     71 	movq	%r10,TF_R10(%rsp)	; \
     72 	movq	%r11,TF_R11(%rsp)	; \
     73 	movq	%r12,TF_R12(%rsp)	; \
     74 	movq	%r13,TF_R13(%rsp)	; \
     75 	movq	%r14,TF_R14(%rsp)	; \
     76 	movq	%r15,TF_R15(%rsp)	; \
     77 	movq	%rbp,TF_RBP(%rsp)	; \
     78 	movq	%rbx,TF_RBX(%rsp)	; \
     79 	movq	%rax,TF_RAX(%rsp)
     80 
     81 #define	INTR_RESTORE_GPRS \
     82 	movq	TF_RDI(%rsp),%rdi	; \
     83 	movq	TF_RSI(%rsp),%rsi	; \
     84 	movq	TF_RDX(%rsp),%rdx	; \
     85 	movq	TF_RCX(%rsp),%rcx	; \
     86 	movq	TF_R8(%rsp),%r8		; \
     87 	movq	TF_R9(%rsp),%r9		; \
     88 	movq	TF_R10(%rsp),%r10	; \
     89 	movq	TF_R11(%rsp),%r11	; \
     90 	movq	TF_R12(%rsp),%r12	; \
     91 	movq	TF_R13(%rsp),%r13	; \
     92 	movq	TF_R14(%rsp),%r14	; \
     93 	movq	TF_R15(%rsp),%r15	; \
     94 	movq	TF_RBP(%rsp),%rbp	; \
     95 	movq	TF_RBX(%rsp),%rbx	; \
     96 	movq	TF_RAX(%rsp),%rax
     97 
     98 #define	INTRENTRY_L(kernel_trap, usertrap) \
     99 	subq	$TF_REGSIZE,%rsp	; \
    100 	INTR_SAVE_GPRS			; \
    101 	cld				; \
    102 	SMAP_ENABLE			; \
    103 	testb	$SEL_UPL,TF_CS(%rsp)	; \
    104 	je	kernel_trap		; \
    105 usertrap				; \
    106 	SWAPGS				; \
    107 	movw	%gs,TF_GS(%rsp)		; \
    108 	movw	%fs,TF_FS(%rsp)		; \
    109 	movw	%es,TF_ES(%rsp)		; \
    110 	movw	%ds,TF_DS(%rsp)
    111 
    112 #define	INTRENTRY \
    113 	INTRENTRY_L(98f,)		; \
    114 98:
    115 
    116 #define INTRFASTEXIT \
    117 	jmp	intrfastexit
    118 
    119 #define INTR_RECURSE_HWFRAME \
    120 	movq	%rsp,%r10		; \
    121 	movl	%ss,%r11d		; \
    122 	pushq	%r11			; \
    123 	pushq	%r10			; \
    124 	pushfq				; \
    125 	movl	%cs,%r11d		; \
    126 	pushq	%r11			; \
    127 /* XEN: We must fixup CS, as even kernel mode runs at CPL 3 */ \
    128  	XEN_ONLY2(andb	$0xfc,(%rsp);)	  \
    129 	pushq	%r13			;
    130 
    131 #define	DO_DEFERRED_SWITCH \
    132 	cmpl	$0, CPUVAR(WANT_PMAPLOAD)		; \
    133 	jz	1f					; \
    134 	call	_C_LABEL(do_pmap_load)			; \
    135 1:
    136 
    137 #define	CHECK_DEFERRED_SWITCH \
    138 	cmpl	$0, CPUVAR(WANT_PMAPLOAD)
    139 
    140 #define CHECK_ASTPENDING(reg)	cmpl	$0, L_MD_ASTPENDING(reg)
    141 #define CLEAR_ASTPENDING(reg)	movl	$0, L_MD_ASTPENDING(reg)
    142 
    143 #endif /* _AMD64_MACHINE_FRAMEASM_H */
    144