[compiler-rt] r317640 - [sanitizer] Asm implementation of syscall() for arm32.
Evgeniy Stepanov via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 7 16:15:12 PST 2017
Author: eugenis
Date: Tue Nov 7 16:15:12 2017
New Revision: 317640
URL: http://llvm.org/viewvc/llvm-project?rev=317640&view=rev
Log:
[sanitizer] Asm implementation of syscall() for arm32.
Summary:
These will be used in an ifunc resolver, when the binary may not be
completely relocated, and syscall() function from libc could not be
used.
Reviewers: dvyukov, vitalybuka
Subscribers: aemerson, kubamracek, javed.absar, llvm-commits, kristof.beyls
Differential Revision: https://reviews.llvm.org/D39701
Added:
compiler-rt/trunk/lib/sanitizer_common/sanitizer_syscall_linux_arm.inc
Modified:
compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc?rev=317640&r1=317639&r2=317640&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_linux.cc Tue Nov 7 16:15:12 2017
@@ -139,6 +139,8 @@ namespace __sanitizer {
#include "sanitizer_syscall_linux_x86_64.inc"
#elif SANITIZER_LINUX && defined(__aarch64__)
#include "sanitizer_syscall_linux_aarch64.inc"
+#elif SANITIZER_LINUX && defined(__arm__)
+#include "sanitizer_syscall_linux_arm.inc"
#else
#include "sanitizer_syscall_generic.inc"
#endif
Added: compiler-rt/trunk/lib/sanitizer_common/sanitizer_syscall_linux_arm.inc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_syscall_linux_arm.inc?rev=317640&view=auto
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_syscall_linux_arm.inc (added)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_syscall_linux_arm.inc Tue Nov 7 16:15:12 2017
@@ -0,0 +1,141 @@
+//===-- sanitizer_syscall_linux_arm.inc -------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Implementations of internal_syscall and internal_iserror for Linux/arm.
+//
+//===----------------------------------------------------------------------===//
+
+#define SYSCALL(name) __NR_ ## name
+
+static uptr __internal_syscall(u32 nr) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0");
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall0(n) \
+ (__internal_syscall)(n)
+
+static uptr __internal_syscall(u32 nr, u32 arg1) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall1(n, a1) \
+ (__internal_syscall)(n, (u32)(a1))
+
+static uptr __internal_syscall(u32 nr, u32 arg1, long arg2) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ register u32 r1 asm("r1") = arg2;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0), "r"(r1)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall2(n, a1, a2) \
+ (__internal_syscall)(n, (u32)(a1), (long)(a2))
+
+static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ register u32 r1 asm("r1") = arg2;
+ register u32 r2 asm("r2") = arg3;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0), "r"(r1), "r"(r2)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall3(n, a1, a2, a3) \
+ (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3))
+
+static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,
+ u32 arg4) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ register u32 r1 asm("r1") = arg2;
+ register u32 r2 asm("r2") = arg3;
+ register u32 r3 asm("r3") = arg4;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall4(n, a1, a2, a3, a4) \
+ (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4))
+
+static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,
+ u32 arg4, long arg5) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ register u32 r1 asm("r1") = arg2;
+ register u32 r2 asm("r2") = arg3;
+ register u32 r3 asm("r3") = arg4;
+ register u32 r4 asm("r4") = arg5;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall5(n, a1, a2, a3, a4, a5) \
+ (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4), \
+ (u32)(a5))
+
+static uptr __internal_syscall(u32 nr, u32 arg1, long arg2, long arg3,
+ u32 arg4, long arg5, long arg6) {
+ register u32 r8 asm("r7") = nr;
+ register u32 r0 asm("r0") = arg1;
+ register u32 r1 asm("r1") = arg2;
+ register u32 r2 asm("r2") = arg3;
+ register u32 r3 asm("r3") = arg4;
+ register u32 r4 asm("r4") = arg5;
+ register u32 r5 asm("r5") = arg6;
+ asm volatile("swi #0"
+ : "=r"(r0)
+ : "r"(r8), "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5)
+ : "memory", "cc");
+ return r0;
+}
+#define __internal_syscall6(n, a1, a2, a3, a4, a5, a6) \
+ (__internal_syscall)(n, (u32)(a1), (long)(a2), (long)(a3), (long)(a4), \
+ (u32)(a5), (long)(a6))
+
+#define __SYSCALL_NARGS_X(a1, a2, a3, a4, a5, a6, a7, a8, n, ...) n
+#define __SYSCALL_NARGS(...) \
+ __SYSCALL_NARGS_X(__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0, )
+#define __SYSCALL_CONCAT_X(a, b) a##b
+#define __SYSCALL_CONCAT(a, b) __SYSCALL_CONCAT_X(a, b)
+#define __SYSCALL_DISP(b, ...) \
+ __SYSCALL_CONCAT(b, __SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__)
+
+#define internal_syscall(...) __SYSCALL_DISP(__internal_syscall, __VA_ARGS__)
+
+#define internal_syscall_ptr internal_syscall
+#define internal_syscall64 internal_syscall
+
+// Helper function used to avoid cobbler errno.
+bool internal_iserror(uptr retval, int *rverrno) {
+ if (retval >= (uptr)-4095) {
+ if (rverrno)
+ *rverrno = -retval;
+ return true;
+ }
+ return false;
+}
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