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[PR] Instrumentation: Add readlink and getdents support 

Summary:
This commit adds support for getting directory entries and
reading value of a symbolic link in instrumentation runtime library

Elvina Yakubova,
Advanced Software Technology Lab, Huawei

(cherry picked from FBD30092362)
This commit is contained in:
Elvina Yakubova 2021-01-18 22:08:10 +08:00 committed by Maksim Panchenko
parent ad79d51778
commit 6665c628ea
1 changed files with 29 additions and 0 deletions
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29
bolt/runtime/common.h
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@ -282,6 +282,35 @@ uint64_t __open(const char *pathname, uint64_t flags, uint64_t mode) {
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"