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45ae17dd7e
Tweak the PLT bypass magic when building glibc with long double
redirects. This is made more difficult by the fact we only get
one chance to redirect functions. This happens via the public
headers.
There are roughly three classes of redirect we need to attend to
today:
1. Simple redirects, redirected via cdef macro overrides and
and new libc_hidden_ldbl_proto macro.
2. Internal usage of internal API, e.g __snprintf, which has
no direct analogue. This is bypassed directly on case-by-
case basis.
3. Double redirects, e.g sscanf and related. These require
a heavier handed approach of macro renaming to existing
symbols.
Most simple redirects are handled via 1. Ideally, the libc_*
macro would live in libc-symbols.h, but in practice the macros
needed for it to do anything useful live in cdefs.h, so they
are defined in the local override.
Notably, the internal name of the asprintf generated for ieee ldbl
redirects is renamed to work with internal prefixed usage.
This resolves the local plt usage introduced when building glibc
with ldbl == ieee128 on ppc64le.
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
294 lines
11 KiB
C
294 lines
11 KiB
C
#ifndef _STDIO_H
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# if !defined _ISOMAC && defined _IO_MTSAFE_IO
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# include <stdio-lock.h>
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# endif
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# include <libio/stdio.h>
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# ifndef _ISOMAC
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# define _LIBC_STDIO_H 1
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# include <libio/libio.h>
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/* Now define the internal interfaces. */
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/* Some libc_hidden_ldbl_proto's do not map to a unique symbol when
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redirecting ldouble to _Float128 variants. We can therefore safely
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directly alias them to their internal name. */
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# if __LONG_DOUBLE_USES_FLOAT128 == 1 && IS_IN (libc)
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# define stdio_hidden_ldbl_proto(p, f) \
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extern __typeof (p ## f) p ## f __asm (__ASMNAME ("___ieee128_" #f));
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# elif __LONG_DOUBLE_USES_FLOAT128 == 1
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# define stdio_hidden_ldbl_proto(p,f) __LDBL_REDIR1_DECL (p ## f, p ## f ## ieee128)
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# else
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# define stdio_hidden_ldbl_proto(p,f) libc_hidden_proto (p ## f)
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# endif
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extern int __fcloseall (void) attribute_hidden;
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extern int __snprintf (char *__restrict __s, size_t __maxlen,
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const char *__restrict __format, ...)
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__attribute__ ((__format__ (__printf__, 3, 4)));
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stdio_hidden_ldbl_proto (__, snprintf)
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extern int __vfscanf (FILE *__restrict __s,
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const char *__restrict __format,
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 2, 0)));
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libc_hidden_proto (__vfscanf)
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extern int __vscanf (const char *__restrict __format,
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 1, 0)));
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extern __ssize_t __getline (char **__lineptr, size_t *__n,
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FILE *__stream) attribute_hidden;
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extern int __vsscanf (const char *__restrict __s,
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const char *__restrict __format,
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__gnuc_va_list __arg)
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__attribute__ ((__format__ (__scanf__, 2, 0)));
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extern int __sprintf_chk (char *, int, size_t, const char *, ...) __THROW;
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extern int __snprintf_chk (char *, size_t, int, size_t, const char *, ...)
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__THROW;
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extern int __vsprintf_chk (char *, int, size_t, const char *,
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__gnuc_va_list) __THROW;
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extern int __vsnprintf_chk (char *, size_t, int, size_t, const char *,
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__gnuc_va_list) __THROW;
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extern int __printf_chk (int, const char *, ...);
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extern int __fprintf_chk (FILE *, int, const char *, ...);
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extern int __vprintf_chk (int, const char *, __gnuc_va_list);
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extern int __vfprintf_chk (FILE *, int, const char *, __gnuc_va_list);
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extern char *__fgets_unlocked_chk (char *buf, size_t size, int n, FILE *fp);
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extern char *__fgets_chk (char *buf, size_t size, int n, FILE *fp);
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extern int __asprintf_chk (char **, int, const char *, ...) __THROW;
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extern int __vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW;
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extern int __dprintf_chk (int, int, const char *, ...);
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extern int __vdprintf_chk (int, int, const char *, __gnuc_va_list);
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extern int __obstack_printf_chk (struct obstack *, int, const char *, ...)
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__THROW;
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extern int __obstack_vprintf_chk (struct obstack *, int, const char *,
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__gnuc_va_list) __THROW;
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extern int __isoc99_fscanf (FILE *__restrict __stream,
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const char *__restrict __format, ...) __wur;
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extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
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extern int __isoc99_sscanf (const char *__restrict __s,
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const char *__restrict __format, ...) __THROW;
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extern int __isoc99_vfscanf (FILE *__restrict __s,
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const char *__restrict __format,
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__gnuc_va_list __arg) __wur;
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extern int __isoc99_vscanf (const char *__restrict __format,
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__gnuc_va_list __arg) __wur;
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extern int __isoc99_vsscanf (const char *__restrict __s,
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const char *__restrict __format,
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__gnuc_va_list __arg) __THROW;
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libc_hidden_proto (__isoc99_sscanf)
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libc_hidden_proto (__isoc99_vsscanf)
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libc_hidden_proto (__isoc99_vfscanf)
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/* Internal uses of sscanf should call the C99-compliant version.
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Unfortunately, symbol redirection is not transitive, so the
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__REDIRECT in the public header does not link up with the above
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libc_hidden_proto. Bridge the gap with a macro. */
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# if !__GLIBC_USE (DEPRECATED_SCANF)
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# undef sscanf
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# define sscanf __isoc99_sscanf
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# endif
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# if __LONG_DOUBLE_USES_FLOAT128 == 1 && IS_IN (libc)
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/* These are implemented as redirects to other public API.
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Therefore, the usual redirection fails to avoid PLT. */
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extern __typeof (__isoc99_sscanf) ___ieee128_isoc99_sscanf __THROW;
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extern __typeof (__isoc99_vsscanf) ___ieee128_isoc99_vsscanf __THROW;
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extern __typeof (__isoc99_vfscanf) ___ieee128_isoc99_vfscanf __THROW;
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libc_hidden_proto (___ieee128_isoc99_sscanf)
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libc_hidden_proto (___ieee128_isoc99_vsscanf)
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libc_hidden_proto (___ieee128_isoc99_vfscanf)
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#define __isoc99_sscanf ___ieee128_isoc99_sscanf
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#define __isoc99_vsscanf ___ieee128_isoc99_vsscanf
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#define __isoc99_vfscanf ___ieee128_isoc99_vfscanf
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# endif
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/* Prototypes for compatibility functions. */
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extern FILE *__new_tmpfile (void);
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extern FILE *__old_tmpfile (void);
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# define __need_size_t
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# include <stddef.h>
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# include <bits/types/wint_t.h>
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/* Generate a unique file name (and possibly open it). */
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extern int __path_search (char *__tmpl, size_t __tmpl_len,
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const char *__dir, const char *__pfx,
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int __try_tempdir) attribute_hidden;
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extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags,
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int __kind) attribute_hidden;
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/* The __kind argument to __gen_tempname may be one of: */
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# define __GT_FILE 0 /* create a file */
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# define __GT_DIR 1 /* create a directory */
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# define __GT_NOCREATE 2 /* just find a name not currently in use */
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enum __libc_message_action
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{
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do_message = 0, /* Print message. */
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do_abort = 1 << 0, /* Abort. */
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};
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/* Print out MESSAGE (which should end with a newline) on the error output
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and abort. */
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extern void __libc_fatal (const char *__message)
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__attribute__ ((__noreturn__));
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extern void __libc_message (enum __libc_message_action action,
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const char *__fnt, ...) attribute_hidden;
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extern void __fortify_fail (const char *msg) __attribute__ ((__noreturn__));
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libc_hidden_proto (__fortify_fail)
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/* Acquire ownership of STREAM. */
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extern void __flockfile (FILE *__stream) attribute_hidden;
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/* Relinquish the ownership granted for STREAM. */
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extern void __funlockfile (FILE *__stream) attribute_hidden;
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/* Try to acquire ownership of STREAM but do not block if it is not
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possible. */
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extern int __ftrylockfile (FILE *__stream);
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extern int __getc_unlocked (FILE *__fp) attribute_hidden;
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extern wint_t __getwc_unlocked (FILE *__fp);
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extern int __fxprintf (FILE *__fp, const char *__fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
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extern int __fxprintf_nocancel (FILE *__fp, const char *__fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
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int __vfxprintf (FILE *__fp, const char *__fmt, __gnuc_va_list,
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unsigned int)
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attribute_hidden;
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/* Read the next line from FP into BUFFER, of LENGTH bytes. LINE will
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include the line terminator and a NUL terminator. On success,
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return the length of the line, including the line terminator, but
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excluding the NUL termintor. On EOF, return zero and write a NUL
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terminator. On error, return -1 and set errno. If the total byte
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count (line and both terminators) exceeds LENGTH, return -1 and set
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errno to ERANGE (but do not mark the stream as failed).
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The behavior is undefined if FP is not seekable, or if the stream
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is already in an error state. */
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ssize_t __libc_readline_unlocked (FILE *fp, char *buffer, size_t length);
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libc_hidden_proto (__libc_readline_unlocked);
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extern const char *const _sys_errlist_internal[] attribute_hidden;
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extern int _sys_nerr_internal attribute_hidden;
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libc_hidden_ldbl_proto (__asprintf)
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# if IS_IN (libc)
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extern FILE *_IO_new_fopen (const char*, const char*);
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# define fopen(fname, mode) _IO_new_fopen (fname, mode)
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extern FILE *_IO_new_fdopen (int, const char*);
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# define fdopen(fd, mode) _IO_new_fdopen (fd, mode)
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extern int _IO_new_fclose (FILE*);
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# define fclose(fp) _IO_new_fclose (fp)
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extern int _IO_fputs (const char*, FILE*);
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libc_hidden_proto (_IO_fputs)
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/* The compiler may optimize calls to fprintf into calls to fputs.
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Use libc_hidden_proto to ensure that those calls, not redirected by
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the fputs macro, also do not go through the PLT. */
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libc_hidden_proto (fputs)
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# define fputs(str, fp) _IO_fputs (str, fp)
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extern int _IO_new_fsetpos (FILE *, const __fpos_t *);
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# define fsetpos(fp, posp) _IO_new_fsetpos (fp, posp)
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extern int _IO_new_fgetpos (FILE *, __fpos_t *);
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# define fgetpos(fp, posp) _IO_new_fgetpos (fp, posp)
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# endif
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extern __typeof (dprintf) __dprintf
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__attribute__ ((__format__ (__printf__, 2, 3)));
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stdio_hidden_ldbl_proto (__, dprintf)
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libc_hidden_ldbl_proto (dprintf)
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libc_hidden_ldbl_proto (fprintf)
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libc_hidden_ldbl_proto (vfprintf)
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libc_hidden_ldbl_proto (sprintf)
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libc_hidden_proto (fwrite)
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libc_hidden_proto (perror)
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libc_hidden_proto (remove)
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libc_hidden_proto (rewind)
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libc_hidden_proto (fileno)
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extern __typeof (fileno) __fileno;
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libc_hidden_proto (__fileno)
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libc_hidden_proto (fwrite)
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libc_hidden_proto (fseek)
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extern __typeof (ftello) __ftello;
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libc_hidden_proto (__ftello)
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extern __typeof (fseeko64) __fseeko64;
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libc_hidden_proto (__fseeko64)
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extern __typeof (ftello64) __ftello64;
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libc_hidden_proto (__ftello64)
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libc_hidden_proto (fflush)
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libc_hidden_proto (fflush_unlocked)
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extern __typeof (fflush_unlocked) __fflush_unlocked;
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libc_hidden_proto (__fflush_unlocked)
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extern __typeof (fread_unlocked) __fread_unlocked;
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libc_hidden_proto (__fread_unlocked)
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libc_hidden_proto (fwrite_unlocked)
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libc_hidden_proto (fgets_unlocked)
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extern __typeof (fgets_unlocked) __fgets_unlocked;
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libc_hidden_proto (__fgets_unlocked)
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libc_hidden_proto (fputs_unlocked)
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extern __typeof (fputs_unlocked) __fputs_unlocked;
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libc_hidden_proto (__fputs_unlocked)
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libc_hidden_proto (feof_unlocked)
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extern __typeof (feof_unlocked) __feof_unlocked attribute_hidden;
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libc_hidden_proto (ferror_unlocked)
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extern __typeof (ferror_unlocked) __ferror_unlocked attribute_hidden;
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libc_hidden_proto (getc_unlocked)
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libc_hidden_proto (fputc_unlocked)
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libc_hidden_proto (putc_unlocked)
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extern __typeof (putc_unlocked) __putc_unlocked attribute_hidden;
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libc_hidden_proto (fmemopen)
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/* The prototype needs repeating instead of using __typeof to use
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__THROW in C++ tests. */
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extern FILE *__open_memstream (char **, size_t *) __THROW __wur;
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libc_hidden_proto (__open_memstream)
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libc_hidden_proto (__libc_fatal)
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rtld_hidden_proto (__libc_fatal)
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libc_hidden_proto (__vsprintf_chk)
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extern FILE * __fmemopen (void *buf, size_t len, const char *mode);
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libc_hidden_proto (__fmemopen)
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extern int __gen_tempfd (int flags);
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libc_hidden_proto (__gen_tempfd)
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# ifdef __USE_EXTERN_INLINES
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__extern_inline int
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__NTH (__feof_unlocked (FILE *__stream))
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{
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return __feof_unlocked_body (__stream);
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}
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__extern_inline int
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__NTH (__ferror_unlocked (FILE *__stream))
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{
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return __ferror_unlocked_body (__stream);
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}
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__extern_inline int
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__getc_unlocked (FILE *__fp)
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{
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return __getc_unlocked_body (__fp);
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}
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__extern_inline int
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__putc_unlocked (int __c, FILE *__stream)
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{
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return __putc_unlocked_body (__c, __stream);
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}
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# endif
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extern __typeof (renameat) __renameat;
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libc_hidden_proto (__renameat)
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extern __typeof (renameat2) __renameat2;
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libc_hidden_proto (__renameat2)
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# endif /* not _ISOMAC */
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#endif /* stdio.h */
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