1 /* $NetBSD: frameasm.h,v 1.28 2018/01/11 09:00:04 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 #include "opt_svs.h" 9 #endif 10 11 /* 12 * Macros to define pushing/popping frames for interrupts, traps 13 * and system calls. Currently all the same; will diverge later. 14 */ 15 16 #ifdef XEN 17 #define HYPERVISOR_iret hypercall_page + (__HYPERVISOR_iret * 32) 18 /* Xen do not need swapgs, done by hypervisor */ 19 #define swapgs 20 #define iretq pushq $0 ; jmp HYPERVISOR_iret 21 #define XEN_ONLY2(x,y) x,y 22 #define NOT_XEN(x) 23 24 #define CLI(temp_reg) \ 25 movq CPUVAR(VCPU),%r ## temp_reg ; \ 26 movb $1,EVTCHN_UPCALL_MASK(%r ## temp_reg); 27 28 #define STI(temp_reg) \ 29 movq CPUVAR(VCPU),%r ## temp_reg ; \ 30 movb $0,EVTCHN_UPCALL_MASK(%r ## temp_reg); 31 32 #else /* XEN */ 33 #define XEN_ONLY2(x,y) 34 #define NOT_XEN(x) x 35 #define CLI(temp_reg) cli 36 #define STI(temp_reg) sti 37 #endif /* XEN */ 38 39 #define HP_NAME_CLAC 1 40 #define HP_NAME_STAC 2 41 #define HP_NAME_NOLOCK 3 42 #define HP_NAME_RETFENCE 4 43 44 #define HOTPATCH(name, size) \ 45 123: ; \ 46 .section .rodata.hotpatch, "a" ; \ 47 .byte name ; \ 48 .byte size ; \ 49 .quad 123b ; \ 50 .previous 51 52 #define SMAP_ENABLE \ 53 HOTPATCH(HP_NAME_CLAC, 3) ; \ 54 .byte 0x0F, 0x1F, 0x00 ; \ 55 56 #define SMAP_DISABLE \ 57 HOTPATCH(HP_NAME_STAC, 3) ; \ 58 .byte 0x0F, 0x1F, 0x00 ; \ 59 60 #define SWAPGS NOT_XEN(swapgs) 61 62 /* 63 * These are used on interrupt or trap entry or exit. 64 */ 65 #define INTR_SAVE_GPRS \ 66 movq %rdi,TF_RDI(%rsp) ; \ 67 movq %rsi,TF_RSI(%rsp) ; \ 68 movq %rdx,TF_RDX(%rsp) ; \ 69 movq %rcx,TF_RCX(%rsp) ; \ 70 movq %r8,TF_R8(%rsp) ; \ 71 movq %r9,TF_R9(%rsp) ; \ 72 movq %r10,TF_R10(%rsp) ; \ 73 movq %r11,TF_R11(%rsp) ; \ 74 movq %r12,TF_R12(%rsp) ; \ 75 movq %r13,TF_R13(%rsp) ; \ 76 movq %r14,TF_R14(%rsp) ; \ 77 movq %r15,TF_R15(%rsp) ; \ 78 movq %rbp,TF_RBP(%rsp) ; \ 79 movq %rbx,TF_RBX(%rsp) ; \ 80 movq %rax,TF_RAX(%rsp) 81 82 #define INTR_RESTORE_GPRS \ 83 movq TF_RDI(%rsp),%rdi ; \ 84 movq TF_RSI(%rsp),%rsi ; \ 85 movq TF_RDX(%rsp),%rdx ; \ 86 movq TF_RCX(%rsp),%rcx ; \ 87 movq TF_R8(%rsp),%r8 ; \ 88 movq TF_R9(%rsp),%r9 ; \ 89 movq TF_R10(%rsp),%r10 ; \ 90 movq TF_R11(%rsp),%r11 ; \ 91 movq TF_R12(%rsp),%r12 ; \ 92 movq TF_R13(%rsp),%r13 ; \ 93 movq TF_R14(%rsp),%r14 ; \ 94 movq TF_R15(%rsp),%r15 ; \ 95 movq TF_RBP(%rsp),%rbp ; \ 96 movq TF_RBX(%rsp),%rbx ; \ 97 movq TF_RAX(%rsp),%rax 98 99 #ifdef SVS 100 #define SVS_ENTER \ 101 pushq %rax ; \ 102 movq CPUVAR(KPDIRPA),%rax ; \ 103 movq %rax,%cr3 ; \ 104 popq %rax 105 #define SVS_LEAVE \ 106 pushq %rax ; \ 107 movq CPUVAR(UPDIRPA),%rax ; \ 108 movq %rax,%cr3 ; \ 109 popq %rax 110 #define SVS_ENTER_NOSTACK \ 111 movq %rax,CPUVAR(SCRATCH) ; \ 112 movq CPUVAR(KPDIRPA),%rax ; \ 113 movq %rax,%cr3 ; \ 114 movq CPUVAR(SCRATCH),%rax 115 #define SVS_LEAVE_NOSTACK \ 116 movq %rax,CPUVAR(SCRATCH) ; \ 117 movq CPUVAR(UPDIRPA),%rax ; \ 118 movq %rax,%cr3 ; \ 119 movq CPUVAR(SCRATCH),%rax 120 #else 121 #define SVS_ENTER /* nothing */ 122 #define SVS_LEAVE /* nothing */ 123 #define SVS_ENTER_NOSTACK /* nothing */ 124 #define SVS_LEAVE_NOSTACK /* nothing */ 125 #endif 126 127 #define INTRENTRY_L(kernel_trap, usertrap) \ 128 subq $TF_REGSIZE,%rsp ; \ 129 INTR_SAVE_GPRS ; \ 130 cld ; \ 131 SMAP_ENABLE ; \ 132 testb $SEL_UPL,TF_CS(%rsp) ; \ 133 je kernel_trap ; \ 134 usertrap ; \ 135 SWAPGS ; \ 136 SVS_ENTER ; \ 137 movw %gs,TF_GS(%rsp) ; \ 138 movw %fs,TF_FS(%rsp) ; \ 139 movw %es,TF_ES(%rsp) ; \ 140 movw %ds,TF_DS(%rsp) 141 142 #define INTRENTRY \ 143 INTRENTRY_L(98f,) ; \ 144 98: 145 146 #define INTRFASTEXIT \ 147 jmp intrfastexit 148 149 #define INTR_RECURSE_HWFRAME \ 150 movq %rsp,%r10 ; \ 151 movl %ss,%r11d ; \ 152 pushq %r11 ; \ 153 pushq %r10 ; \ 154 pushfq ; \ 155 movl %cs,%r11d ; \ 156 pushq %r11 ; \ 157 /* XEN: We must fixup CS, as even kernel mode runs at CPL 3 */ \ 158 XEN_ONLY2(andb $0xfc,(%rsp);) \ 159 pushq %r13 ; 160 161 #define DO_DEFERRED_SWITCH \ 162 cmpl $0, CPUVAR(WANT_PMAPLOAD) ; \ 163 jz 1f ; \ 164 call _C_LABEL(do_pmap_load) ; \ 165 1: 166 167 #define CHECK_DEFERRED_SWITCH \ 168 cmpl $0, CPUVAR(WANT_PMAPLOAD) 169 170 #define CHECK_ASTPENDING(reg) cmpl $0, L_MD_ASTPENDING(reg) 171 #define CLEAR_ASTPENDING(reg) movl $0, L_MD_ASTPENDING(reg) 172 173 #endif /* _AMD64_MACHINE_FRAMEASM_H */ 174