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88f4b6929c
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>
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/* Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _LINUX_SPARC64_SYSDEP_H
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#define _LINUX_SPARC64_SYSDEP_H 1
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#include <sysdeps/unix/sysv/linux/sparc/sysdep.h>
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#if IS_IN (rtld)
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# include <dl-sysdep.h> /* Defines RTLD_PRIVATE_ERRNO. */
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#endif
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#include <tls.h>
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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#ifdef __ASSEMBLER__
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#define LOADSYSCALL(x) mov __NR_##x, %g1
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY(name); \
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LOADSYSCALL(syscall_name); \
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ta 0x6d; \
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bcc,pt %xcc, 1f; \
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nop; \
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SYSCALL_ERROR_HANDLER \
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1:
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#undef PSEUDO_NOERRNO
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#define PSEUDO_NOERRNO(name, syscall_name, args)\
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.text; \
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ENTRY(name); \
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LOADSYSCALL(syscall_name); \
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ta 0x6d;
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#undef PSEUDO_ERRVAL
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#define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY(name); \
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LOADSYSCALL(syscall_name); \
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ta 0x6d;
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#undef PSEUDO_END
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#define PSEUDO_END(name) \
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END(name)
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#ifndef PIC
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# define SYSCALL_ERROR_HANDLER \
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mov %o7, %g1; \
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call __syscall_error; \
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mov %g1, %o7;
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#else
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER \
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0: SETUP_PIC_REG_LEAF(o2,g1) \
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sethi %gdop_hix22(rtld_errno), %g1; \
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xor %g1, %gdop_lox10(rtld_errno), %g1;\
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ldx [%o2 + %g1], %g1, %gdop(rtld_errno); \
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st %o0, [%g1]; \
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jmp %o7 + 8; \
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mov -1, %o0;
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# elif defined _LIBC_REENTRANT
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# if IS_IN (libc)
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# define SYSCALL_ERROR_ERRNO __libc_errno
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# else
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# define SYSCALL_ERROR_ERRNO errno
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# endif
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# define SYSCALL_ERROR_HANDLER \
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0: SETUP_PIC_REG_LEAF(o2,g1) \
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sethi %tie_hi22(SYSCALL_ERROR_ERRNO), %g1; \
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add %g1, %tie_lo10(SYSCALL_ERROR_ERRNO), %g1; \
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ldx [%o2 + %g1], %g1, %tie_ldx(SYSCALL_ERROR_ERRNO);\
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st %o0, [%g7 + %g1]; \
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jmp %o7 + 8; \
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mov -1, %o0;
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# else
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# define SYSCALL_ERROR_HANDLER \
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0: SETUP_PIC_REG_LEAF(o2,g1) \
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sethi %gdop_hix22(errno), %g1;\
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xor %g1, %gdop_lox10(errno), %g1;\
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ldx [%o2 + %g1], %g1, %gdop(errno);\
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st %o0, [%g1]; \
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jmp %o7 + 8; \
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mov -1, %o0;
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# endif /* _LIBC_REENTRANT */
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#endif /* PIC */
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#else /* __ASSEMBLER__ */
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#define __SYSCALL_STRING \
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"ta 0x6d;" \
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"bcc,pt %%xcc, 1f;" \
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" nop;" \
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"sub %%g0, %%o0, %%o0;" \
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"1:"
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#define __SYSCALL_CLOBBERS \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
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"f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", \
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"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", \
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"cc", "memory"
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#endif /* __ASSEMBLER__ */
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/* This is the offset from the %sp to the backing store above the
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register windows. So if you poke stack memory directly you add this. */
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#define STACK_BIAS 2047
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#endif /* linux/sparc64/sysdep.h */
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