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llvm-project/bolt/runtime/common.h

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//===- bolt/runtime/common.h ------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#if !defined(__APPLE__)
#include <cstddef>
#include <cstdint>
#include "config.h"
#ifdef HAVE_ELF_H
#include <elf.h>
#endif
#else
typedef __SIZE_TYPE__ size_t;
#define __SSIZE_TYPE__ \
__typeof__(_Generic((__SIZE_TYPE__)0, unsigned long long int \
: (long long int)0, unsigned long int \
: (long int)0, unsigned int \
: (int)0, unsigned short \
: (short)0, unsigned char \
: (signed char)0))
typedef __SSIZE_TYPE__ ssize_t;
typedef unsigned long long uint64_t;
typedef unsigned uint32_t;
typedef unsigned char uint8_t;
typedef long long int64_t;
typedef int int32_t;
#endif
// Save all registers while keeping 16B stack alignment
#define SAVE_ALL \
"push %%rax\n" \
"push %%rbx\n" \
"push %%rcx\n" \
"push %%rdx\n" \
"push %%rdi\n" \
"push %%rsi\n" \
"push %%rbp\n" \
"push %%r8\n" \
"push %%r9\n" \
"push %%r10\n" \
"push %%r11\n" \
"push %%r12\n" \
"push %%r13\n" \
"push %%r14\n" \
"push %%r15\n" \
"sub $8, %%rsp\n"
// Mirrors SAVE_ALL
#define RESTORE_ALL \
"add $8, %%rsp\n" \
"pop %%r15\n" \
"pop %%r14\n" \
"pop %%r13\n" \
"pop %%r12\n" \
"pop %%r11\n" \
"pop %%r10\n" \
"pop %%r9\n" \
"pop %%r8\n" \
"pop %%rbp\n" \
"pop %%rsi\n" \
"pop %%rdi\n" \
"pop %%rdx\n" \
"pop %%rcx\n" \
"pop %%rbx\n" \
"pop %%rax\n"
// Anonymous namespace covering everything but our library entry point
namespace {
constexpr uint32_t BufSize = 10240;
#define _STRINGIFY(x) #x
#define STRINGIFY(x) _STRINGIFY(x)
uint64_t __read(uint64_t fd, const void *buf, uint64_t count) {
uint64_t ret;
#if defined(__APPLE__)
#define READ_SYSCALL 0x2000003
#else
#define READ_SYSCALL 0
#endif
__asm__ __volatile__("movq $" STRINGIFY(READ_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(fd), "S"(buf), "d"(count)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __write(uint64_t fd, const void *buf, uint64_t count) {
uint64_t ret;
#if defined(__APPLE__)
#define WRITE_SYSCALL 0x2000004
#else
#define WRITE_SYSCALL 1
#endif
__asm__ __volatile__("movq $" STRINGIFY(WRITE_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(fd), "S"(buf), "d"(count)
: "cc", "rcx", "r11", "memory");
return ret;
}
void *__mmap(uint64_t addr, uint64_t size, uint64_t prot, uint64_t flags,
uint64_t fd, uint64_t offset) {
#if defined(__APPLE__)
#define MMAP_SYSCALL 0x20000c5
#else
#define MMAP_SYSCALL 9
#endif
void *ret;
register uint64_t r8 asm("r8") = fd;
register uint64_t r9 asm("r9") = offset;
register uint64_t r10 asm("r10") = flags;
__asm__ __volatile__("movq $" STRINGIFY(MMAP_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(addr), "S"(size), "d"(prot), "r"(r10), "r"(r8),
"r"(r9)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __munmap(void *addr, uint64_t size) {
#if defined(__APPLE__)
#define MUNMAP_SYSCALL 0x2000049
#else
#define MUNMAP_SYSCALL 11
#endif
uint64_t ret;
__asm__ __volatile__("movq $" STRINGIFY(MUNMAP_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(addr), "S"(size)
: "cc", "rcx", "r11", "memory");
return ret;
}
#define SIG_BLOCK 0
#define SIG_UNBLOCK 1
#define SIG_SETMASK 2
static const uint64_t MaskAllSignals[] = {-1ULL};
uint64_t __sigprocmask(int how, const void *set, void *oldset) {
#if defined(__APPLE__)
#define SIGPROCMASK_SYSCALL 0x2000030
#else
#define SIGPROCMASK_SYSCALL 14
#endif
uint64_t ret;
register long r10 asm("r10") = sizeof(uint64_t);
__asm__ __volatile__("movq $" STRINGIFY(SIGPROCMASK_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(how), "S"(set), "d"(oldset), "r"(r10)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __exit(uint64_t code) {
#if defined(__APPLE__)
#define EXIT_SYSCALL 0x2000001
#else
#define EXIT_SYSCALL 231
#endif
uint64_t ret;
__asm__ __volatile__("movq $" STRINGIFY(EXIT_SYSCALL) ", %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(code)
: "cc", "rcx", "r11", "memory");
return ret;
}
// Helper functions for writing strings to the .fdata file. We intentionally
// avoid using libc names (lowercase memset) to make it clear it is our impl.
/// Write number Num using Base to the buffer in OutBuf, returns a pointer to
/// the end of the string.
char *intToStr(char *OutBuf, uint64_t Num, uint32_t Base) {
const char *Chars = "0123456789abcdef";
char Buf[21];
char *Ptr = Buf;
while (Num) {
*Ptr++ = *(Chars + (Num % Base));
Num /= Base;
}
if (Ptr == Buf) {
*OutBuf++ = '0';
return OutBuf;
}
while (Ptr != Buf)
*OutBuf++ = *--Ptr;
return OutBuf;
}
/// Copy Str to OutBuf, returns a pointer to the end of the copied string
char *strCopy(char *OutBuf, const char *Str, int32_t Size = BufSize) {
while (*Str) {
*OutBuf++ = *Str++;
if (--Size <= 0)
return OutBuf;
}
return OutBuf;
}
/// Compare two strings, at most Num bytes.
int strnCmp(const char *Str1, const char *Str2, size_t Num) {
while (Num && *Str1 && (*Str1 == *Str2)) {
Num--;
Str1++;
Str2++;
}
if (Num == 0)
return 0;
return *(unsigned char *)Str1 - *(unsigned char *)Str2;
}
void memSet(char *Buf, char C, uint32_t Size) {
for (int I = 0; I < Size; ++I)
*Buf++ = C;
}
void *memCpy(void *Dest, const void *Src, size_t Len) {
char *d = static_cast<char *>(Dest);
const char *s = static_cast<const char *>(Src);
while (Len--)
*d++ = *s++;
return Dest;
}
uint32_t strLen(const char *Str) {
uint32_t Size = 0;
while (*Str++)
++Size;
return Size;
}
void reportNumber(const char *Msg, uint64_t Num, uint32_t Base) {
char Buf[BufSize];
char *Ptr = Buf;
Ptr = strCopy(Ptr, Msg, BufSize - 23);
Ptr = intToStr(Ptr, Num, Base);
Ptr = strCopy(Ptr, "\n");
__write(2, Buf, Ptr - Buf);
}
void report(const char *Msg) { __write(2, Msg, strLen(Msg)); }
unsigned long hexToLong(const char *Str, char Terminator = '\0') {
unsigned long Res = 0;
while (*Str != Terminator) {
Res <<= 4;
if ('0' <= *Str && *Str <= '9')
Res += *Str++ - '0';
else if ('a' <= *Str && *Str <= 'f')
Res += *Str++ - 'a' + 10;
else if ('A' <= *Str && *Str <= 'F')
Res += *Str++ - 'A' + 10;
else
return 0;
}
return Res;
}
#if !defined(__APPLE__)
// We use a stack-allocated buffer for string manipulation in many pieces of
// this code, including the code that prints each line of the fdata file. This
// buffer needs to accomodate large function names, but shouldn't be arbitrarily
// large (dynamically allocated) for simplicity of our memory space usage.
// Declare some syscall wrappers we use throughout this code to avoid linking
// against system libc.
uint64_t __open(const char *pathname, uint64_t flags, uint64_t mode) {
uint64_t ret;
__asm__ __volatile__("movq $2, %%rax\n"
"syscall"
: "=a"(ret)
: "D"(pathname), "S"(flags), "d"(mode)
: "cc", "rcx", "r11", "memory");
return ret;
}
struct dirent {
unsigned long d_ino; /* Inode number */
unsigned long d_off; /* Offset to next linux_dirent */
unsigned short d_reclen; /* Length of this linux_dirent */
char d_name[]; /* Filename (null-terminated) */
/* length is actually (d_reclen - 2 -
offsetof(struct linux_dirent, d_name)) */
};
long __getdents(unsigned int fd, dirent *dirp, size_t count) {
long ret;
__asm__ __volatile__("movq $78, %%rax\n"
"syscall"
: "=a"(ret)
: "D"(fd), "S"(dirp), "d"(count)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __readlink(const char *pathname, char *buf, size_t bufsize) {
uint64_t ret;
__asm__ __volatile__("movq $89, %%rax\n"
"syscall"
: "=a"(ret)
: "D"(pathname), "S"(buf), "d"(bufsize)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __lseek(uint64_t fd, uint64_t pos, uint64_t whence) {
uint64_t ret;
__asm__ __volatile__("movq $8, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(fd), "S"(pos), "d"(whence)
: "cc", "rcx", "r11", "memory");
return ret;
}
int __close(uint64_t fd) {
uint64_t ret;
__asm__ __volatile__("movq $3, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(fd)
: "cc", "rcx", "r11", "memory");
return ret;
}
int __madvise(void *addr, size_t length, int advice) {
int ret;
__asm__ __volatile__("movq $28, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(addr), "S"(length), "d"(advice)
: "cc", "rcx", "r11", "memory");
return ret;
}
struct timespec {
uint64_t tv_sec; /* seconds */
uint64_t tv_nsec; /* nanoseconds */
};
uint64_t __nanosleep(const timespec *req, timespec *rem) {
uint64_t ret;
__asm__ __volatile__("movq $35, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(req), "S"(rem)
: "cc", "rcx", "r11", "memory");
return ret;
}
int64_t __fork() {
uint64_t ret;
__asm__ __volatile__("movq $57, %%rax\n"
"syscall\n"
: "=a"(ret)
:
: "cc", "rcx", "r11", "memory");
return ret;
}
int __mprotect(void *addr, size_t len, int prot) {
int ret;
__asm__ __volatile__("movq $10, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(addr), "S"(len), "d"(prot)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __getpid() {
uint64_t ret;
__asm__ __volatile__("movq $39, %%rax\n"
"syscall\n"
: "=a"(ret)
:
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __getppid() {
uint64_t ret;
__asm__ __volatile__("movq $110, %%rax\n"
"syscall\n"
: "=a"(ret)
:
: "cc", "rcx", "r11", "memory");
return ret;
}
int __setpgid(uint64_t pid, uint64_t pgid) {
int ret;
__asm__ __volatile__("movq $109, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(pid), "S"(pgid)
: "cc", "rcx", "r11", "memory");
return ret;
}
uint64_t __getpgid(uint64_t pid) {
uint64_t ret;
__asm__ __volatile__("movq $121, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(pid)
: "cc", "rcx", "r11", "memory");
return ret;
}
int __kill(uint64_t pid, int sig) {
int ret;
__asm__ __volatile__("movq $62, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(pid), "S"(sig)
: "cc", "rcx", "r11", "memory");
return ret;
}
int __fsync(int fd) {
int ret;
__asm__ __volatile__("movq $74, %%rax\n"
"syscall\n"
: "=a"(ret)
: "D"(fd)
: "cc", "rcx", "r11", "memory");
return ret;
}
#endif
void reportError(const char *Msg, uint64_t Size) {
__write(2, Msg, Size);
__exit(1);
}
void assert(bool Assertion, const char *Msg) {
if (Assertion)
return;
char Buf[BufSize];
char *Ptr = Buf;
Ptr = strCopy(Ptr, "Assertion failed: ");
Ptr = strCopy(Ptr, Msg, BufSize - 40);
Ptr = strCopy(Ptr, "\n");
reportError(Buf, Ptr - Buf);
}
/// 1B mutex accessed by lock xchg
class Mutex {
volatile bool InUse{false};
public:
bool acquire() {
bool Result = true;
asm volatile("lock; xchg %0, %1" : "+m"(InUse), "=r"(Result) : : "cc");
return !Result;
}
void release() { InUse = false; }
};
/// RAII wrapper for Mutex
class Lock {
Mutex &M;
uint64_t SignalMask[1] = {};
public:
Lock(Mutex &M) : M(M) {
__sigprocmask(SIG_BLOCK, MaskAllSignals, SignalMask);
while (!M.acquire()) {
}
}
~Lock() {
M.release();
__sigprocmask(SIG_SETMASK, SignalMask, nullptr);
}
};
/// RAII wrapper for Mutex
class TryLock {
Mutex &M;
bool Locked = false;
public:
TryLock(Mutex &M) : M(M) {
int Retry = 100;
while (--Retry && !M.acquire())
;
if (Retry)
Locked = true;
}
bool isLocked() { return Locked; }
~TryLock() {
if (isLocked())
M.release();
}
};
inline uint64_t alignTo(uint64_t Value, uint64_t Align) {
return (Value + Align - 1) / Align * Align;
}
} // anonymous namespace
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