05107edc91
Building sigaltstack with clang via:
$ ARCH=x86 make LLVM=1 -C tools/testing/selftests/sigaltstack/
produces the following warning:
warning: variable 'sp' is uninitialized when used here [-Wuninitialized]
if (sp < (unsigned long)sstack ||
^~
Clang expects these to be declared at global scope; we've fixed this in
the kernel proper by using the macro `current_stack_pointer`. This is
defined in different headers for different target architectures, so just
create a new header that defines the arch-specific register names for
the stack pointer register, and define it for more targets (at least the
ones that support current_stack_pointer/ARCH_HAS_CURRENT_STACK_POINTER).
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Link: https://lore.kernel.org/lkml/CA+G9fYsi3OOu7yCsMutpzKDnBMAzJBCPimBp86LhGBa0eCnEpA@mail.gmail.com/
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
24 lines
646 B
C
24 lines
646 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#if __alpha__
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register unsigned long sp asm("$30");
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#elif __arm__ || __aarch64__ || __csky__ || __m68k__ || __mips__ || __riscv
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register unsigned long sp asm("sp");
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#elif __i386__
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register unsigned long sp asm("esp");
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#elif __loongarch64
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register unsigned long sp asm("$sp");
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#elif __ppc__
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register unsigned long sp asm("r1");
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#elif __s390x__
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register unsigned long sp asm("%15");
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#elif __sh__
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register unsigned long sp asm("r15");
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#elif __x86_64__
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register unsigned long sp asm("rsp");
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#elif __XTENSA__
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register unsigned long sp asm("a1");
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#else
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#error "implement current_stack_pointer equivalent"
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#endif
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