frameasm.h revision 1.37.2.1
1 /* $NetBSD: frameasm.h,v 1.37.2.1 2018/03/30 06:20:11 pgoyette 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 #define HP_NAME_SVS_ENTER 5 44 #define HP_NAME_SVS_LEAVE 6 45 #define HP_NAME_SVS_ENTER_ALT 7 46 #define HP_NAME_SVS_LEAVE_ALT 8 47 #define HP_NAME_IBRS_ENTER 9 48 #define HP_NAME_IBRS_LEAVE 10 49 50 #define HOTPATCH(name, size) \ 51 123: ; \ 52 .pushsection .rodata.hotpatch, "a" ; \ 53 .byte name ; \ 54 .byte size ; \ 55 .quad 123b ; \ 56 .popsection 57 58 #define SMAP_ENABLE \ 59 HOTPATCH(HP_NAME_CLAC, 3) ; \ 60 .byte 0x0F, 0x1F, 0x00 ; \ 61 62 #define SMAP_DISABLE \ 63 HOTPATCH(HP_NAME_STAC, 3) ; \ 64 .byte 0x0F, 0x1F, 0x00 ; \ 65 66 /* 67 * IBRS 68 */ 69 70 #define IBRS_ENTER_BYTES 17 71 #define IBRS_ENTER \ 72 HOTPATCH(HP_NAME_IBRS_ENTER, IBRS_ENTER_BYTES) ; \ 73 NOIBRS_ENTER 74 #define NOIBRS_ENTER \ 75 .byte 0xEB, (IBRS_ENTER_BYTES-2) /* jmp */ ; \ 76 .fill (IBRS_ENTER_BYTES-2),1,0xCC 77 78 #define IBRS_LEAVE_BYTES 21 79 #define IBRS_LEAVE \ 80 HOTPATCH(HP_NAME_IBRS_LEAVE, IBRS_LEAVE_BYTES) ; \ 81 NOIBRS_LEAVE 82 #define NOIBRS_LEAVE \ 83 .byte 0xEB, (IBRS_LEAVE_BYTES-2) /* jmp */ ; \ 84 .fill (IBRS_LEAVE_BYTES-2),1,0xCC 85 86 #define SWAPGS NOT_XEN(swapgs) 87 88 /* 89 * These are used on interrupt or trap entry or exit. 90 */ 91 #define INTR_SAVE_GPRS \ 92 movq %rdi,TF_RDI(%rsp) ; \ 93 movq %rsi,TF_RSI(%rsp) ; \ 94 movq %rdx,TF_RDX(%rsp) ; \ 95 movq %rcx,TF_RCX(%rsp) ; \ 96 movq %r8,TF_R8(%rsp) ; \ 97 movq %r9,TF_R9(%rsp) ; \ 98 movq %r10,TF_R10(%rsp) ; \ 99 movq %r11,TF_R11(%rsp) ; \ 100 movq %r12,TF_R12(%rsp) ; \ 101 movq %r13,TF_R13(%rsp) ; \ 102 movq %r14,TF_R14(%rsp) ; \ 103 movq %r15,TF_R15(%rsp) ; \ 104 movq %rbp,TF_RBP(%rsp) ; \ 105 movq %rbx,TF_RBX(%rsp) ; \ 106 movq %rax,TF_RAX(%rsp) 107 108 #define INTR_RESTORE_GPRS \ 109 movq TF_RDI(%rsp),%rdi ; \ 110 movq TF_RSI(%rsp),%rsi ; \ 111 movq TF_RDX(%rsp),%rdx ; \ 112 movq TF_RCX(%rsp),%rcx ; \ 113 movq TF_R8(%rsp),%r8 ; \ 114 movq TF_R9(%rsp),%r9 ; \ 115 movq TF_R10(%rsp),%r10 ; \ 116 movq TF_R11(%rsp),%r11 ; \ 117 movq TF_R12(%rsp),%r12 ; \ 118 movq TF_R13(%rsp),%r13 ; \ 119 movq TF_R14(%rsp),%r14 ; \ 120 movq TF_R15(%rsp),%r15 ; \ 121 movq TF_RBP(%rsp),%rbp ; \ 122 movq TF_RBX(%rsp),%rbx ; \ 123 movq TF_RAX(%rsp),%rax 124 125 #define TEXT_USER_BEGIN .pushsection .text.user, "ax" 126 #define TEXT_USER_END .popsection 127 128 #ifdef SVS 129 130 /* XXX: put this somewhere else */ 131 #define SVS_UTLS 0xffffc00000000000 /* PMAP_PCPU_BASE */ 132 #define UTLS_KPDIRPA 0 133 #define UTLS_SCRATCH 8 134 #define UTLS_RSP0 16 135 136 #define SVS_ENTER_BYTES 22 137 #define NOSVS_ENTER \ 138 .byte 0xEB, (SVS_ENTER_BYTES-2) /* jmp */ ; \ 139 .fill (SVS_ENTER_BYTES-2),1,0xCC 140 #define SVS_ENTER \ 141 HOTPATCH(HP_NAME_SVS_ENTER, SVS_ENTER_BYTES) ; \ 142 NOSVS_ENTER 143 144 #define SVS_LEAVE_BYTES 31 145 #define NOSVS_LEAVE \ 146 .byte 0xEB, (SVS_LEAVE_BYTES-2) /* jmp */ ; \ 147 .fill (SVS_LEAVE_BYTES-2),1,0xCC 148 #define SVS_LEAVE \ 149 HOTPATCH(HP_NAME_SVS_LEAVE, SVS_LEAVE_BYTES) ; \ 150 NOSVS_LEAVE 151 152 #define SVS_ENTER_ALT_BYTES 23 153 #define NOSVS_ENTER_ALTSTACK \ 154 .byte 0xEB, (SVS_ENTER_ALT_BYTES-2) /* jmp */ ; \ 155 .fill (SVS_ENTER_ALT_BYTES-2),1,0xCC 156 #define SVS_ENTER_ALTSTACK \ 157 HOTPATCH(HP_NAME_SVS_ENTER_ALT, SVS_ENTER_ALT_BYTES) ; \ 158 NOSVS_ENTER_ALTSTACK 159 160 #define SVS_LEAVE_ALT_BYTES 22 161 #define NOSVS_LEAVE_ALTSTACK \ 162 .byte 0xEB, (SVS_LEAVE_ALT_BYTES-2) /* jmp */ ; \ 163 .fill (SVS_LEAVE_ALT_BYTES-2),1,0xCC 164 #define SVS_LEAVE_ALTSTACK \ 165 HOTPATCH(HP_NAME_SVS_LEAVE_ALT, SVS_LEAVE_ALT_BYTES) ; \ 166 NOSVS_LEAVE_ALTSTACK 167 168 #else 169 #define SVS_ENTER /* nothing */ 170 #define SVS_LEAVE /* nothing */ 171 #define SVS_ENTER_ALTSTACK /* nothing */ 172 #define SVS_LEAVE_ALTSTACK /* nothing */ 173 #endif 174 175 #define INTRENTRY \ 176 subq $TF_REGSIZE,%rsp ; \ 177 INTR_SAVE_GPRS ; \ 178 cld ; \ 179 SMAP_ENABLE ; \ 180 testb $SEL_UPL,TF_CS(%rsp) ; \ 181 je 98f ; \ 182 SWAPGS ; \ 183 IBRS_ENTER ; \ 184 SVS_ENTER ; \ 185 movw %gs,TF_GS(%rsp) ; \ 186 movw %fs,TF_FS(%rsp) ; \ 187 movw %es,TF_ES(%rsp) ; \ 188 movw %ds,TF_DS(%rsp) ; \ 189 98: 190 191 #define INTRFASTEXIT \ 192 jmp intrfastexit 193 194 #define INTR_RECURSE_HWFRAME \ 195 movq %rsp,%r10 ; \ 196 movl %ss,%r11d ; \ 197 pushq %r11 ; \ 198 pushq %r10 ; \ 199 pushfq ; \ 200 pushq $GSEL(GCODE_SEL,SEL_KPL); \ 201 /* XEN: We must fixup CS, as even kernel mode runs at CPL 3 */ \ 202 XEN_ONLY2(andb $0xfc,(%rsp);) \ 203 pushq %r13 ; 204 205 #define INTR_RECURSE_ENTRY \ 206 subq $TF_REGSIZE,%rsp ; \ 207 INTR_SAVE_GPRS ; \ 208 cld 209 210 #define CHECK_DEFERRED_SWITCH \ 211 cmpl $0, CPUVAR(WANT_PMAPLOAD) 212 213 #define CHECK_ASTPENDING(reg) cmpl $0, L_MD_ASTPENDING(reg) 214 #define CLEAR_ASTPENDING(reg) movl $0, L_MD_ASTPENDING(reg) 215 216 #endif /* _AMD64_MACHINE_FRAMEASM_H */ 217
Indexes created Thu Oct 02 14:10:14 GMT 2025