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| author | Florian Weimer <fweimer@redhat.com> | 2022-10-18 17:00:07 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2022-10-18 17:03:55 +0200 |
| commit | 88f4b6929c26f9240a4b0b7dcc62922f02544a09 (patch) | |
| tree | 72acb4a359d3ec56729a910386bd1a002bd69e3c /sysdeps/unix/sysv/linux/csky/sysdep.h | |
| parent | 246f37d6b1c4c6c0a6365df8783e62e3adf208e8 (diff) | |
| download | glibc-88f4b6929c26f9240a4b0b7dcc62922f02544a09.tar.gz glibc-88f4b6929c26f9240a4b0b7dcc62922f02544a09.tar.xz glibc-88f4b6929c26f9240a4b0b7dcc62922f02544a09.zip | |
Introduce <pointer_guard.h>, extracted from <sysdep.h>
This allows us to define a generic no-op version of PTR_MANGLE and PTR_DEMANGLE. In the future, we can use PTR_MANGLE and PTR_DEMANGLE unconditionally in C sources, avoiding an unintended loss of hardening due to missing include files or unlucky header inclusion ordering. In i386 and x86_64, we can avoid a <tls.h> dependency in the C code by using the computed constant from <tcb-offsets.h>. <sysdep.h> no longer includes these definitions, so there is no cyclic dependency anymore when computing the <tcb-offsets.h> constants. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/csky/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/csky/sysdep.h | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/sysdeps/unix/sysv/linux/csky/sysdep.h b/sysdeps/unix/sysv/linux/csky/sysdep.h index 56c527fa8b..76b09f0cc6 100644 --- a/sysdeps/unix/sysv/linux/csky/sysdep.h +++ b/sysdeps/unix/sysv/linux/csky/sysdep.h @@ -466,50 +466,4 @@ __local_syscall_error: \ #endif /* __ASSEMBLER__ */ -/* Pointer mangling support. */ -#if (IS_IN (rtld) \ - || (!defined SHARED && (IS_IN (libc) || IS_IN (libpthread)))) -# ifdef __ASSEMBLER__ -# define PTR_MANGLE(dst, src, guard) \ - grs t0, 1f; \ -1: \ - lrw guard, 1b@GOTPC; \ - addu t0, guard; \ - lrw guard, __pointer_chk_guard_local@GOT; \ - ldr.w guard, (t0, guard << 0); \ - ldw guard, (guard, 0); \ - xor dst, src, guard; -# define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard) -# define PTR_MANGLE2(dst, src, guard) \ - xor dst, src, guard -# define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard) -# else -extern uintptr_t __pointer_chk_guard_local; -# define PTR_MANGLE(var) \ - (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local) -# define PTR_DEMANGLE(var) PTR_MANGLE (var) -# endif -#else -# ifdef __ASSEMBLER__ -# define PTR_MANGLE(dst, src, guard) \ - grs t0, 1f; \ -1: \ - lrw guard, 1b@GOTPC; \ - addu t0, guard; \ - lrw guard, __pointer_chk_guard@GOT; \ - ldr.w guard, (t0, guard << 0); \ - ldw guard, (guard, 0); \ - xor dst, src, guard; -# define PTR_DEMANGLE(dst, src, guard) PTR_MANGLE (dst, src, guard) -# define PTR_MANGLE2(dst, src, guard) \ - xor dst, src, guard -# define PTR_DEMANGLE2(dst, src, guard) PTR_MANGLE2 (dst, src, guard) -# else -extern uintptr_t __pointer_chk_guard; -# define PTR_MANGLE(var) \ - (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard) -# define PTR_DEMANGLE(var) PTR_MANGLE (var) -# endif -#endif - #endif /* linux/csky/sysdep.h */ |