mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 03:33:59 +08:00
774c105ed8
MIPS is introducing new variants of its O32 ABI which differ in their handling of floating point, in order to enable a gradual transition towards a world where mips32 binaries can take advantage of new hardware features only available when configured for certain FP modes. In order to do this ELF binaries are being augmented with a new section that indicates, amongst other things, the FP mode requirements of the binary. The presence & location of such a section is indicated by a program header in the PT_LOPROC ... PT_HIPROC range. In order to allow the MIPS architecture code to examine the program header & section in question, pass all program headers in this range to an architecture-specific arch_elf_pt_proc function. This function may return an error if the header is deemed invalid or unsuitable for the system, in which case that error will be returned from load_elf_binary and upwards through the execve syscall. A means is required for the architecture code to make a decision once it is known that all such headers have been seen, but before it is too late to return from an execve syscall. For this purpose the arch_check_elf function is added, and called once, after all PT_LOPROC to PT_HIPROC headers have been passed to arch_elf_pt_proc but before the code which invoked execve has been lost. This enables the architecture code to make a decision based upon all the headers present in an ELF binary and its interpreter, as is required to forbid conflicting FP ABI requirements between an ELF & its interpreter. In order to allow data to be stored throughout the calls to the above functions, struct arch_elf_state is introduced. Finally a variant of the SET_PERSONALITY macro is introduced which accepts a pointer to the struct arch_elf_state, allowing it to act based upon state observed from the architecture specific program headers. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7679/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#ifndef _LINUX_ELF_H
|
|
#define _LINUX_ELF_H
|
|
|
|
#include <asm/elf.h>
|
|
#include <uapi/linux/elf.h>
|
|
|
|
#ifndef elf_read_implies_exec
|
|
/* Executables for which elf_read_implies_exec() returns TRUE will
|
|
have the READ_IMPLIES_EXEC personality flag set automatically.
|
|
Override in asm/elf.h as needed. */
|
|
# define elf_read_implies_exec(ex, have_pt_gnu_stack) 0
|
|
#endif
|
|
#ifndef SET_PERSONALITY
|
|
#define SET_PERSONALITY(ex) \
|
|
set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
|
|
#endif
|
|
|
|
#ifndef SET_PERSONALITY2
|
|
#define SET_PERSONALITY2(ex, state) \
|
|
SET_PERSONALITY(ex)
|
|
#endif
|
|
|
|
#if ELF_CLASS == ELFCLASS32
|
|
|
|
extern Elf32_Dyn _DYNAMIC [];
|
|
#define elfhdr elf32_hdr
|
|
#define elf_phdr elf32_phdr
|
|
#define elf_shdr elf32_shdr
|
|
#define elf_note elf32_note
|
|
#define elf_addr_t Elf32_Off
|
|
#define Elf_Half Elf32_Half
|
|
|
|
#else
|
|
|
|
extern Elf64_Dyn _DYNAMIC [];
|
|
#define elfhdr elf64_hdr
|
|
#define elf_phdr elf64_phdr
|
|
#define elf_shdr elf64_shdr
|
|
#define elf_note elf64_note
|
|
#define elf_addr_t Elf64_Off
|
|
#define Elf_Half Elf64_Half
|
|
|
|
#endif
|
|
|
|
/* Optional callbacks to write extra ELF notes. */
|
|
struct file;
|
|
struct coredump_params;
|
|
|
|
#ifndef ARCH_HAVE_EXTRA_ELF_NOTES
|
|
static inline int elf_coredump_extra_notes_size(void) { return 0; }
|
|
static inline int elf_coredump_extra_notes_write(struct coredump_params *cprm) { return 0; }
|
|
#else
|
|
extern int elf_coredump_extra_notes_size(void);
|
|
extern int elf_coredump_extra_notes_write(struct coredump_params *cprm);
|
|
#endif
|
|
#endif /* _LINUX_ELF_H */
|