1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
|
; RUN: llc < %s -mtriple=i686-pc-windows-msvc | FileCheck %s -check-prefix=X32
; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s -check-prefix=X64
; Control Flow Guard is currently only available on Windows
; Test that Control Flow Guard checks are correctly added when required.
declare i32 @target_func()
; Test that Control Flow Guard checks are not added on calls with the "guard_nocf" attribute.
define i32 @func_guard_nocf() {
entry:
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
%0 = load i32 ()*, i32 ()** %func_ptr, align 8
%1 = call i32 %0() #0
ret i32 %1
; X32-LABEL: func_guard_nocf
; X32: movl $_target_func, %eax
; X32-NOT: __guard_check_icall_fptr
; X32: calll *%eax
; X64-LABEL: func_guard_nocf
; X64: leaq target_func(%rip), %rax
; X64-NOT: __guard_dispatch_icall_fptr
; X64: callq *%rax
}
attributes #0 = { "guard_nocf" }
; Test that Control Flow Guard checks are added even at -O0.
; FIXME Ideally these checks should be added as a single call instruction, as in the optimized case.
define i32 @func_optnone_cf() #1 {
entry:
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
%0 = load i32 ()*, i32 ()** %func_ptr, align 8
%1 = call i32 %0()
ret i32 %1
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: func_optnone_cf
; X32: leal _target_func, %eax
; X32: movl %eax, (%esp)
; X32: movl (%esp), %ecx
; X32: movl ___guard_check_icall_fptr, %eax
; X32: calll *%eax
; X32-NEXT: calll *%ecx
; On x86_64, __guard_dispatch_icall_fptr tail calls the function, so there should be only one call instruction.
; X64-LABEL: func_optnone_cf
; X64: leaq target_func(%rip), %rax
; X64: movq __guard_dispatch_icall_fptr(%rip), %rcx
; X64: callq *%rcx
; X64-NOT: callq
}
attributes #1 = { noinline optnone }
; Test that Control Flow Guard checks are correctly added in optimized code (common case).
define i32 @func_cf() {
entry:
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
%0 = load i32 ()*, i32 ()** %func_ptr, align 8
%1 = call i32 %0()
ret i32 %1
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: func_cf
; X32: movl $_target_func, %esi
; X32: movl $_target_func, %ecx
; X32: calll *___guard_check_icall_fptr
; X32-NEXT: calll *%esi
; On x86_64, __guard_dispatch_icall_fptr tail calls the function, so there should be only one call instruction.
; X64-LABEL: func_cf
; X64: leaq target_func(%rip), %rax
; X64: callq *__guard_dispatch_icall_fptr(%rip)
; X64-NOT: callq
}
; Test that Control Flow Guard checks are correctly added on invoke instructions.
define i32 @func_cf_invoke() personality i8* bitcast (void ()* @h to i8*) {
entry:
%0 = alloca i32, align 4
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
%1 = load i32 ()*, i32 ()** %func_ptr, align 8
%2 = invoke i32 %1()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
ret i32 %2
lpad: ; preds = %entry
%tmp = landingpad { i8*, i32 }
catch i8* null
ret i32 -1
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: func_cf_invoke
; X32: movl $_target_func, %esi
; X32: movl $_target_func, %ecx
; X32: calll *___guard_check_icall_fptr
; X32-NEXT: calll *%esi
; X32: # %invoke.cont
; X32: # %lpad
; On x86_64, __guard_dispatch_icall_fptr tail calls the function, so there should be only one call instruction.
; X64-LABEL: func_cf_invoke
; X64: leaq target_func(%rip), %rax
; X64: callq *__guard_dispatch_icall_fptr(%rip)
; X64-NOT: callq
; X64: # %invoke.cont
; X64: # %lpad
}
declare void @h()
; Test that Control Flow Guard preserves floating point arguments.
declare double @target_func_doubles(double, double, double, double)
define double @func_cf_doubles() {
entry:
%func_ptr = alloca double (double, double, double, double)*, align 8
store double (double, double, double, double)* @target_func_doubles, double (double, double, double, double)** %func_ptr, align 8
%0 = load double (double, double, double, double)*, double (double, double, double, double)** %func_ptr, align 8
%1 = call double %0(double 1.000000e+00, double 2.000000e+00, double 3.000000e+00, double 4.000000e+00)
ret double %1
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: func_cf_doubles
; X32: movl $_target_func_doubles, %esi
; X32: movl $_target_func_doubles, %ecx
; X32: calll *___guard_check_icall_fptr
; X32: calll *%esi
; On x86_64, __guard_dispatch_icall_fptr tail calls the function, so there should be only one call instruction.
; X64-LABEL: func_cf_doubles
; X64: leaq target_func_doubles(%rip), %rax
; X64: movsd __real@3ff0000000000000(%rip), %xmm0
; X64: movsd __real@4000000000000000(%rip), %xmm1
; X64: movsd __real@4008000000000000(%rip), %xmm2
; X64: movsd __real@4010000000000000(%rip), %xmm3
; X64: callq *__guard_dispatch_icall_fptr(%rip)
; X64-NOT: callq
}
; Test that Control Flow Guard checks are correctly added for tail calls.
define i32 @func_cf_tail() {
entry:
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
%0 = load i32 ()*, i32 ()** %func_ptr, align 8
%1 = musttail call i32 %0()
ret i32 %1
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: func_cf_tail
; X32: movl $_target_func, %ecx
; X32: calll *___guard_check_icall_fptr
; X32: movl $_target_func, %eax
; X32: jmpl *%eax # TAILCALL
; X32-NOT: calll
; X64-LABEL: func_cf_tail
; X64: leaq target_func(%rip), %rax
; X64: rex64 jmpq *__guard_dispatch_icall_fptr(%rip) # TAILCALL
; X64-NOT: callq
}
; Test that Control FLow Guard Checks are added well for targets in try-catch.
%eh.ThrowInfo = type { i32, i8*, i8*, i8* }
declare i32 @__CxxFrameHandler3(...)
declare void @_CxxThrowException(i8*, %eh.ThrowInfo*)
define i32 @func_cf_exception() personality i32 (...)* @__CxxFrameHandler3 {
entry:
%func_ptr = alloca i32 ()*, align 8
store i32 ()* @target_func, i32 ()** %func_ptr, align 8
invoke void @_CxxThrowException(i8* null, %eh.ThrowInfo* null) #11
to label %unreachable unwind label %ehcleanup
ehcleanup:
%0 = cleanuppad within none []
%isnull = icmp eq i32 ()** %func_ptr, null
br i1 %isnull, label %exit, label %callfn
callfn:
%1 = load i32 ()*, i32 ()** %func_ptr, align 8
%2 = call i32 %1() #9 [ "funclet"(token %0) ]
br label %exit
exit:
cleanupret from %0 unwind label %catch.dispatch
unreachable:
unreachable
catch.dispatch:
%3 = catchswitch within none [label %catch] unwind to caller
catch:
%4 = catchpad within %3 [i8* null, i32 64, i8* null]
catchret from %4 to label %try.cont
try.cont:
ret i32 0
; X32-LABEL: func_cf_exception
; X32: calll *___guard_check_icall_fptr
; X32-NEXT: calll *%ecx
; X64-LABEL: func_cf_exception
; X64: callq *__guard_dispatch_icall_fptr(%rip)
; X64-NOT: callq
}
%struct.Foo = type { i32 (%struct.Foo*)** }
; Test that Control Flow Guard checks are correctly added for variadic musttail
; calls. These are used for MS C++ ABI virtual member pointer thunks.
; PR44049
define i32 @vmptr_thunk(%struct.Foo* inreg %p) {
entry:
%vptr.addr = getelementptr inbounds %struct.Foo, %struct.Foo* %p, i32 0, i32 0
%vptr = load i32 (%struct.Foo*)**, i32 (%struct.Foo*)*** %vptr.addr
%slot = getelementptr inbounds i32 (%struct.Foo*)*, i32 (%struct.Foo*)** %vptr, i32 1
%vmethod = load i32 (%struct.Foo*)*, i32 (%struct.Foo*)** %slot
%rv = musttail call i32 %vmethod(%struct.Foo* inreg %p)
ret i32 %rv
; On i686, the call to __guard_check_icall_fptr should come immediately before the call to the target function.
; X32-LABEL: _vmptr_thunk:
; X32: movl %eax, %esi
; X32: movl (%eax), %eax
; X32: movl 4(%eax), %ecx
; X32: calll *___guard_check_icall_fptr
; X32: movl %esi, %eax
; X32: jmpl *%ecx # TAILCALL
; X32-NOT: calll
; Use NEXT here because we previously had an extra instruction in this sequence.
; X64-LABEL: vmptr_thunk:
; X64: movq (%rcx), %rax
; X64-NEXT: movq 8(%rax), %rax
; X64-NEXT: movq __guard_dispatch_icall_fptr(%rip), %rdx
; X64-NEXT: rex64 jmpq *%rdx # TAILCALL
; X64-NOT: callq
}
; Test that longjmp targets have public labels and are included in the .gljmp section.
%struct._SETJMP_FLOAT128 = type { [2 x i64] }
@buf1 = internal global [16 x %struct._SETJMP_FLOAT128] zeroinitializer, align 16
define i32 @func_cf_setjmp() {
%1 = alloca i32, align 4
%2 = alloca i32, align 4
store i32 0, i32* %1, align 4
store i32 -1, i32* %2, align 4
%3 = call i8* @llvm.frameaddress(i32 0)
%4 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %3) #2
; X32-LABEL: func_cf_setjmp
; X32: calll __setjmp
; X32-NEXT: $cfgsj_func_cf_setjmp0:
; X64-LABEL: func_cf_setjmp
; X64: callq _setjmp
; X64-NEXT: $cfgsj_func_cf_setjmp0:
%5 = call i8* @llvm.frameaddress(i32 0)
%6 = call i32 @_setjmp(i8* bitcast ([16 x %struct._SETJMP_FLOAT128]* @buf1 to i8*), i8* %5) #2
; X32: calll __setjmp
; X32-NEXT: $cfgsj_func_cf_setjmp1:
; X64: callq _setjmp
; X64-NEXT: $cfgsj_func_cf_setjmp1:
store i32 1, i32* %2, align 4
%7 = load i32, i32* %2, align 4
ret i32 %7
; X32: .section .gljmp$y,"dr"
; X32-NEXT: .symidx $cfgsj_func_cf_setjmp0
; X32-NEXT: .symidx $cfgsj_func_cf_setjmp1
; X64: .section .gljmp$y,"dr"
; X64-NEXT: .symidx $cfgsj_func_cf_setjmp0
; X64-NEXT: .symidx $cfgsj_func_cf_setjmp1
}
declare i8* @llvm.frameaddress(i32)
; Function Attrs: returns_twice
declare dso_local i32 @_setjmp(i8*, i8*) #2
attributes #2 = { returns_twice }
!llvm.module.flags = !{!0}
!0 = !{i32 2, !"cfguard", i32 2}
|