nickdesaulniers

# Skip the following 2 if coming from a CC=clang LD=ld.lld from above.
$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make CC=clang -j71 defconfig
$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make CC=clang -j71 menuconfig
# enable CONFIG_THUMB2_KERNEL=y and save
$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make CC=clang -j71
$ llvm-readelf -S kernel/futex.o
...
  [10] __ex_table        PROGBITS        00000000 005168 0000c0 00   A  0   0  8
  [11] .rel__ex_table    REL             00000000 009454 000180 08   I 31  10  4
  [12] .text.fixup       PROGBITS        00000000 005228 000060 00  AX  0   0  4

nickdesaulniers

typedef 'typedef'	 [StartOfLine]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:35:1>
long 'long'	 [LeadingSpace]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:35:9 <Spelling=<built-in>:109:26>>
int 'int'	 [LeadingSpace]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:35:9 <Spelling=<built-in>:109:31>>
identifier 'ptrdiff_t'	 [LeadingSpace]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:35:26>
semi ';'		Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:35:35>
typedef 'typedef'	 [StartOfLine]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:46:1>
long 'long'	 [LeadingSpace]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:46:9 <Spelling=<built-in>:117:23>>
unsigned 'unsigned'	 [LeadingSpace]	Loc=</android0/llvm-project/llvm/build/lib/clang/11.0.0/include/stddef.h:46:9 <Spelling=<built-in>:117:28>>
int 'int'	 [LeadingSpace]	Loc=</android0/

nickdesaulniers

enum { a } b(void);
c, d, g, h;
i(int);
j() {
  int e;
  asm goto("" : : : : f);
  return a;
f:;
}
k() { asm("" : : "Qo"(d), "r"(c)); }

nickdesaulniers

# 1 "drivers/media/pci/bt8xx/bttv-cards.c"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 359 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "././include/linux/kconfig.h" 1

nickdesaulniers

diff --git a/llvm/unittests/IR/InstructionsTest.cpp b/llvm/unittests/IR/InstructionsTest.cpp
index 9b9efe33cfed..159c63a5c5c4 100644
--- a/llvm/unittests/IR/InstructionsTest.cpp
+++ b/llvm/unittests/IR/InstructionsTest.cpp
@@ -1061,5 +1061,55 @@ TEST(InstructionsTest, FNegInstruction) {
   FNeg->deleteValue();
 }
 
+TEST(InstructionsTest, CallBrInstruction) {
+  LLVMContext Context;

nickdesaulniers

diff --git a/arch/x86/purgatory/string.c b/arch/x86/purgatory/string.c
index 3cb67d44ca31..d2b2364ea2e8 100644
--- a/arch/x86/purgatory/string.c
+++ b/arch/x86/purgatory/string.c
@@ -10,4 +10,27 @@
 
 #include <linux/types.h>
 
-#include "../boot/compressed/string.c"
+#include "../boot/string.c"

nickdesaulniers

; RUN: opt -loop-unroll -S -o - %s 2>&1 | FileCheck %s

; CHECK: if.then:
; CHECK-NEXT: callbr void asm sideeffect "1: nop\0A\09.quad b, ${0:l}, $$5\0A\09", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@d, %l_yes))
; CHECK-NEXT: to label %asm.fallthrough [label %l_yes]
; CHECK: l_yes:

; CHECK: if.then.1:
; CHECK-NEXT: callbr void asm sideeffect "1: nop\0A\09.quad b, ${0:l}, $$5\0A\09", "X,~{dirflag},~{fpsr},~{flags}"(i8* blockaddress(@d, %l_yes.1))
; CHECK-NEXT: to label %asm.fallthrough.1 [label %l_yes.1]

nickdesaulniers

arch/x86/ia32/ia32_signal.o: warning: objtool: ia32_setup_rt_frame()+0x44c: call to memset() with UACCESS enabled
arch/x86/kernel/signal.o: warning: objtool: x32_setup_rt_frame()+0x226: call to memset() with UACCESS enabled
arch/x86/kernel/signal.o: warning: objtool: __setup_rt_frame()+0x23c: call to memset() with UACCESS enabled
mm/kasan/common.o: warning: objtool: kasan_report()+0x52: call to __stack_chk_fail() with UACCESS enabled
drivers/ata/sata_dwc_460ex.o: warning: objtool: sata_dwc_bmdma_start_by_tag()+0x3a0: can't find switch jump table
lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch()+0x8d: call to memcpy() with UACCESS enabled
lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch_v1()+0x8d: call to memcpy() with UACCESS enabled
drivers/gpu/drm/i915/i915_gem_execbuffer.o: warning: objtool: .altinstr_replacement+0x56: redundant UACCESS disable

nickdesaulniers

*** IR Dump After Loop-Closed SSA Form Pass ***
; Function Attrs: noredzone nounwind sspstrong
define hidden void @get_fixed_ranges(i8* nocapture) local_unnamed_addr #0 {
  %2 = bitcast i8* %0 to i32*
  tail call void @k8_check_syscfg_dram_mod_en() #5
  %3 = tail call { i64, i64 } asm sideeffect "1: rdmsr\0A2:\0A .pushsection \22__ex_table\22,\22a\2
2\0A .balign 4\0A .long (1b) - .\0A .long (2b) - .\0A .long (ex_handler_rdmsr_unsafe) - .\0A .popse
ction\0A", "={ax},={dx},{cx},~{dirflag},~{fpsr},~{flags}"(i32 592) #6, !srcloc !3
  %4 = extractvalue { i64, i64 } %3, 0
  %5 = extractvalue { i64, i64 } %3, 1

nickdesaulniers

; llvm-extract -func get_fixed_ranges generic.ll -o generic.get_fixed_ranges.ll -S --recursive
; ModuleID = 'generic.ll'
source_filename = "arch/x86/kernel/cpu/mtrr/generic.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.cpuinfo_x86 = type { i8, i8, i8, i8, i32, i8, i8, i8, i8, i32, i32, [20 x i32], [16 x i8], [64 x i8], i32, i32, i32, i32, i32, i64, i16, i16, i16, i16, i16, i16, i16, i16, i16, i32, i8, i8 }
%struct.tracepoint = type { i8*, %struct.static_key, i32 ()*, void ()*, %struct.tracepoint_func* }
%struct.static_key = type { %struct.atomic_t, %union.anon }
%struct.atomic_t = type { i32 }