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0bb87f051e
Like amd64, mips has two 32bit ABIs - o32 and n32. Unlike amd64,
it does not use compat_binfmt_elf.c for either of those; each
of those ABIs has a binfmt handler of its own, both very similar
to fs/compat_binfmt_elf.c. And the same technics as we use on
amd64 can be used to make fs/compat_binfmt_elf.c handle both.
* merge elfo32_check_arch() with elfn32_check_arch(),
make that serve as compat_elf_check_arch(). Note that
SET_PERSONALITY2() is already the same for all ABI variants -
it looks at the elf header to choose the flags to set.
* add asm/elfcore-compat.h, using the bigger (n32) variant
of elf32_prstatus as compat_elf_prstatus there.
* make PRSTATUS_SIZE() and SET_PR_FPVALID() choose the
right layout, same as done for amd64. test_thread_flag(TIF_32BIT_REGS)
is used as the predicate.
Voila - we are rid of binfmt_elf{n,o}32.c; fs/compat_binfmt_elf.c is
used, same as for all other ELF-supporting 64bit architectures that
need 32bit compat.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
30 lines
841 B
C
30 lines
841 B
C
#ifndef _ASM_MIPS_ELFCORE_COMPAT_H
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#define _ASM_MIPS_ELFCORE_COMPAT_H
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/*
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* On mips we have two 32bit ABIs - o32 and n32. The latter
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* has bigger registers, so we use it for compat_elf_regset_t.
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* The former uses o32_elf_prstatus and PRSTATUS_SIZE/SET_PR_FPVALID
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* are used to choose the size and location of ->pr_fpvalid of
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* the layout actually used.
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*/
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typedef elf_gregset_t compat_elf_gregset_t;
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struct o32_elf_prstatus
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{
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struct compat_elf_prstatus_common common;
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unsigned int pr_reg[ELF_NGREG];
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compat_int_t pr_fpvalid;
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};
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#define PRSTATUS_SIZE \
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(!test_thread_flag(TIF_32BIT_REGS) \
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? sizeof(struct compat_elf_prstatus) \
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: sizeof(struct o32_elf_prstatus))
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#define SET_PR_FPVALID(S) \
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(*(!test_thread_flag(TIF_32BIT_REGS) \
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? &(S)->pr_fpvalid \
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: &((struct o32_elf_prstatus *)(S))->pr_fpvalid) = 1)
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#endif
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