[libc] Enable most of the libc entrypoitns for riscv

This patch enables most of the libc entrypoints for riscv, except for
fstatvfs, statvfs, dmull and fmull which are currently failing
compilation. float16 is also not added, as rv32 doesn't seem to support
it yet.

This patch also fixes the call to seek, which should take an off_t, and
was missed in PR llvm#68269.

libc/config/linux/riscv/entrypoints.txt

@@ -17,6 +17,12 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.ctype.tolower
     libc.src.ctype.toupper
 
+    # dlfcn.h entrypoints
+    libc.src.dlfcn.dlclose
+    libc.src.dlfcn.dlerror
+    libc.src.dlfcn.dlopen
+    libc.src.dlfcn.dlsym
+
     # errno.h entrypoints
     libc.src.errno.errno
 
@@ -52,6 +58,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.string.mempcpy
     libc.src.string.memrchr
     libc.src.string.memset
+    libc.src.string.memset_explicit
     libc.src.string.rindex
     libc.src.string.stpcpy
     libc.src.string.stpncpy
@@ -180,6 +187,9 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdlib.qsort_r
     libc.src.stdlib.rand
     libc.src.stdlib.srand
+    libc.src.stdlib.strfromd
+    libc.src.stdlib.strfromf
+    libc.src.stdlib.strfroml
     libc.src.stdlib.strtod
     libc.src.stdlib.strtof
     libc.src.stdlib.strtol
@@ -197,6 +207,7 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # stdio.h entrypoints
     libc.src.stdio.fdopen
+    libc.src.stdio.fileno
     libc.src.stdio.fprintf
     libc.src.stdio.fscanf
     libc.src.stdio.printf
@@ -211,6 +222,14 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.stdio.vsnprintf
     libc.src.stdio.vsprintf
 
+    # sys/epoll.h entrypoints
+    libc.src.sys.epoll.epoll_create
+    libc.src.sys.epoll.epoll_create1
+    libc.src.sys.epoll.epoll_ctl
+    libc.src.sys.epoll.epoll_pwait
+    libc.src.sys.epoll.epoll_wait
+    libc.src.sys.epoll.epoll_pwait2
+
     # sys/mman.h entrypoints
     libc.src.sys.mman.madvise
     libc.src.sys.mman.mincore
@@ -261,12 +280,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     # sys/auxv.h entrypoints
     libc.src.sys.auxv.getauxval
 
-    # sys/epoll.h entrypoints
-    # Disabled due to epoll_wait syscalls not being available on this platform.
-    # libc.src.sys.epoll.epoll_wait
-    # libc.src.sys.epoll.epoll_pwait
-    # libc.src.sys.epoll.epoll_pwait2
-
     # termios.h entrypoints
     libc.src.termios.cfgetispeed
     libc.src.termios.cfgetospeed
@@ -302,6 +315,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.linkat
     libc.src.unistd.lseek
     libc.src.unistd.pathconf
+    libc.src.unistd.pipe
     libc.src.unistd.pread
     libc.src.unistd.pwrite
     libc.src.unistd.read
@@ -347,6 +361,9 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.atan2f
     libc.src.math.atanf
     libc.src.math.atanhf
+    libc.src.math.canonicalize
+    libc.src.math.canonicalizef
+    libc.src.math.canonicalizel
     libc.src.math.cbrt
     libc.src.math.cbrtf
     libc.src.math.ceil
@@ -365,6 +382,7 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.exp10f
     libc.src.math.exp2
     libc.src.math.exp2f
+    libc.src.math.exp2m1f
     libc.src.math.expf
     libc.src.math.expm1
     libc.src.math.expm1f
@@ -492,6 +510,9 @@ set(TARGET_LIBM_ENTRYPOINTS
     libc.src.math.rintf
     libc.src.math.rintl
     libc.src.math.round
+    libc.src.math.roundeven
+    libc.src.math.roundevenf
+    libc.src.math.roundevenl
     libc.src.math.roundf
     libc.src.math.roundl
     libc.src.math.scalbn
@@ -523,8 +544,10 @@ set(TARGET_LIBM_ENTRYPOINTS
 if(LIBC_TYPES_HAS_FLOAT128)
   list(APPEND TARGET_LIBM_ENTRYPOINTS
     # math.h C23 _Float128 entrypoints
+    libc.src.math.canonicalizef128
     libc.src.math.ceilf128
     libc.src.math.copysignf128
+    libc.src.math.dmulf128
     libc.src.math.fabsf128
     libc.src.math.fdimf128
     libc.src.math.floorf128
@@ -539,6 +562,7 @@ if(LIBC_TYPES_HAS_FLOAT128)
     libc.src.math.fminimum_numf128
     libc.src.math.fminimumf128
     libc.src.math.fmodf128
+    libc.src.math.fmulf128
     libc.src.math.frexpf128
     libc.src.math.fromfpf128
     libc.src.math.fromfpxf128
@@ -556,7 +580,9 @@ if(LIBC_TYPES_HAS_FLOAT128)
     libc.src.math.nextafterf128
     libc.src.math.nextdownf128
     libc.src.math.nextupf128
+    libc.src.math.remquof128
     libc.src.math.rintf128
+    libc.src.math.roundevenf128
     libc.src.math.roundf128
     libc.src.math.scalbnf128
     libc.src.math.sqrtf128
@@ -566,14 +592,47 @@ if(LIBC_TYPES_HAS_FLOAT128)
   )
 endif()
 
+if(LIBC_COMPILER_HAS_FIXED_POINT)
+  list(APPEND TARGET_LIBM_ENTRYPOINTS
+    # stdfix.h _Fract and _Accum entrypoints
+    libc.src.stdfix.abshk
+    libc.src.stdfix.abshr
+    libc.src.stdfix.absk
+    libc.src.stdfix.abslk
+    libc.src.stdfix.abslr
+    libc.src.stdfix.absr
+    libc.src.stdfix.exphk
+    libc.src.stdfix.expk
+    libc.src.stdfix.roundhk
+    libc.src.stdfix.roundhr
+    libc.src.stdfix.roundk
+    libc.src.stdfix.roundlk
+    libc.src.stdfix.roundlr
+    libc.src.stdfix.roundr
+    libc.src.stdfix.rounduhk
+    libc.src.stdfix.rounduhr
+    libc.src.stdfix.rounduk
+    libc.src.stdfix.roundulk
+    libc.src.stdfix.roundulr
+    libc.src.stdfix.roundur
+    libc.src.stdfix.sqrtuhk
+    libc.src.stdfix.sqrtuhr
+    libc.src.stdfix.sqrtuk
+    libc.src.stdfix.sqrtur
+    libc.src.stdfix.sqrtulr
+    libc.src.stdfix.uhksqrtus
+    libc.src.stdfix.uksqrtui
+  )
+endif()
+
 if(LLVM_LIBC_FULL_BUILD)
   list(APPEND TARGET_LIBC_ENTRYPOINTS
-    # compiler entrypoints (no corresponding header)
-    libc.src.compiler.__stack_chk_fail
-
     # assert.h entrypoints
     libc.src.assert.__assert_fail
 
+    # compiler entrypoints (no corresponding header)
+    libc.src.compiler.__stack_chk_fail
+
     # dirent.h entrypoints
     libc.src.dirent.closedir
     libc.src.dirent.dirfd
@@ -598,6 +657,12 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.pthread.pthread_attr_setguardsize
     libc.src.pthread.pthread_attr_setstack
     libc.src.pthread.pthread_attr_setstacksize
+    libc.src.pthread.pthread_condattr_destroy
+    libc.src.pthread.pthread_condattr_getclock
+    libc.src.pthread.pthread_condattr_getpshared
+    libc.src.pthread.pthread_condattr_init
+    libc.src.pthread.pthread_condattr_setclock
+    libc.src.pthread.pthread_condattr_setpshared
     libc.src.pthread.pthread_create
     libc.src.pthread.pthread_detach
     libc.src.pthread.pthread_equal
@@ -620,6 +685,21 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.pthread.pthread_mutexattr_setrobust
     libc.src.pthread.pthread_mutexattr_settype
     libc.src.pthread.pthread_once
+    libc.src.pthread.pthread_rwlock_destroy
+    libc.src.pthread.pthread_rwlock_init
+    libc.src.pthread.pthread_rwlock_rdlock
+    libc.src.pthread.pthread_rwlock_timedrdlock
+    libc.src.pthread.pthread_rwlock_timedwrlock
+    libc.src.pthread.pthread_rwlock_tryrdlock
+    libc.src.pthread.pthread_rwlock_trywrlock
+    libc.src.pthread.pthread_rwlock_unlock
+    libc.src.pthread.pthread_rwlock_wrlock
+    libc.src.pthread.pthread_rwlockattr_destroy
+    libc.src.pthread.pthread_rwlockattr_getkind_np
+    libc.src.pthread.pthread_rwlockattr_getpshared
+    libc.src.pthread.pthread_rwlockattr_init
+    libc.src.pthread.pthread_rwlockattr_setkind_np
+    libc.src.pthread.pthread_rwlockattr_setpshared
     libc.src.pthread.pthread_self
     libc.src.pthread.pthread_setname_np
     libc.src.pthread.pthread_setspecific
@@ -643,7 +723,6 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fgetc
     libc.src.stdio.fgetc_unlocked
     libc.src.stdio.fgets
-    libc.src.stdio.fileno
     libc.src.stdio.flockfile
     libc.src.stdio.fopen
     libc.src.stdio.fopencookie
@@ -652,7 +731,9 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.stdio.fread
     libc.src.stdio.fread_unlocked
     libc.src.stdio.fseek
+    libc.src.stdio.fseeko
     libc.src.stdio.ftell
+    libc.src.stdio.ftello
     libc.src.stdio.funlockfile
     libc.src.stdio.fwrite
     libc.src.stdio.fwrite_unlocked
@@ -673,9 +754,11 @@ if(LLVM_LIBC_FULL_BUILD)
     # stdlib.h entrypoints
     libc.src.stdlib._Exit
     libc.src.stdlib.abort
+    libc.src.stdlib.at_quick_exit
     libc.src.stdlib.atexit
     libc.src.stdlib.exit
     libc.src.stdlib.getenv
+    libc.src.stdlib.quick_exit
 
     # signal.h entrypoints
     libc.src.signal.kill
@@ -757,6 +840,10 @@ if(LLVM_LIBC_FULL_BUILD)
 
     # sys/select.h entrypoints
     libc.src.sys.select.select
+
+    # sys/socket.h entrypoints
+    libc.src.sys.socket.bind
+    libc.src.sys.socket.socket
   )
 endif()
 

libc/config/linux/x86_64/entrypoints.txt

@@ -228,9 +228,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.sys.epoll.epoll_ctl
     libc.src.sys.epoll.epoll_pwait
     libc.src.sys.epoll.epoll_wait
-    # TODO: Need to check if pwait2 is available before providing.
-    # https://github.com/llvm/llvm-project/issues/80060
-    # libc.src.sys.epoll.epoll_pwait2
+    libc.src.sys.epoll.epoll_pwait2
 
     # sys/mman.h entrypoints
     libc.src.sys.mman.madvise

libc/src/__support/File/file.cpp

@@ -282,7 +282,7 @@ int File::ungetc_unlocked(int c) {
   return c;
 }
 
-ErrorOr<int> File::seek(long offset, int whence) {
+ErrorOr<int> File::seek(off_t offset, int whence) {
   FileLock lock(this);
   if (prev_op == FileOp::WRITE && pos > 0) {
 

libc/src/__support/File/file.h

@@ -183,7 +183,7 @@ class File {
     return read_unlocked(data, len);
   }
 
-  ErrorOr<int> seek(long offset, int whence);
+  ErrorOr<int> seek(off_t offset, int whence);
 
   ErrorOr<off_t> tell();
 

libc/test/src/__support/File/platform_file_test.cpp

@@ -103,7 +103,8 @@ TEST(LlvmLibcPlatformFileTest, CreateAppendSeekAndReadBack) {
   constexpr size_t APPEND_TEXT_SIZE = sizeof(APPEND_TEXT) - 1;
   ASSERT_EQ(file->write(APPEND_TEXT, APPEND_TEXT_SIZE).value, APPEND_TEXT_SIZE);
 
-  ASSERT_EQ(file->seek(-APPEND_TEXT_SIZE, SEEK_END).value(), 0);
+  ASSERT_EQ(file->seek(-static_cast<off_t>(APPEND_TEXT_SIZE), SEEK_END).value(),
+            0);
   char data[APPEND_TEXT_SIZE + 1];
   ASSERT_EQ(file->read(data, APPEND_TEXT_SIZE).value, APPEND_TEXT_SIZE);
   data[APPEND_TEXT_SIZE] = '\0';