From 50b2b2e691cd4ff30331ba9a6156b29a07b60f90 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Sat, 22 Jul 2017 01:02:40 -0400 Subject: ARM: add ELF_FDPIC support This includes the necessary code to recognise the FDPIC format on ARM and the ptrace command definitions used by the common ptrace code. Based on patches originally from Mickael Guene . Signed-off-by: Nicolas Pitre Acked-by: Mickael GUENE Tested-by: Vincent Abriou Tested-by: Andras Szemzo --- arch/arm/include/asm/elf.h | 12 ++++++++++++ arch/arm/include/asm/mmu.h | 4 ++++ 2 files changed, 16 insertions(+) (limited to 'arch/arm/include/asm') diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h index e2786acf8202..ad0ca4f2ba13 100644 --- a/arch/arm/include/asm/elf.h +++ b/arch/arm/include/asm/elf.h @@ -100,6 +100,11 @@ struct elf32_hdr; extern int elf_check_arch(const struct elf32_hdr *); #define elf_check_arch elf_check_arch +#define ELFOSABI_ARM_FDPIC 65 /* ARM FDPIC platform */ +#define elf_check_fdpic(x) ((x)->e_ident[EI_OSABI] == ELFOSABI_ARM_FDPIC) +#define elf_check_const_displacement(x) ((x)->e_flags & EF_ARM_PIC) +#define ELF_FDPIC_CORE_EFLAGS 0 + #define vmcore_elf64_check_arch(x) (0) extern int arm_elf_read_implies_exec(int); @@ -120,6 +125,13 @@ int dump_task_regs(struct task_struct *t, elf_gregset_t *elfregs); have no such handler. */ #define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0 +#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \ + do { \ + (_r)->ARM_r7 = _exec_map_addr; \ + (_r)->ARM_r8 = _interp_map_addr; \ + (_r)->ARM_r9 = dynamic_addr; \ + } while(0) + extern void elf_set_personality(const struct elf32_hdr *); #define SET_PERSONALITY(ex) elf_set_personality(&(ex)) diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h index a5b47421059d..e0eb16680a5b 100644 --- a/arch/arm/include/asm/mmu.h +++ b/arch/arm/include/asm/mmu.h @@ -33,6 +33,10 @@ typedef struct { */ typedef struct { unsigned long end_brk; +#ifdef CONFIG_BINFMT_ELF_FDPIC + unsigned long exec_fdpic_loadmap; + unsigned long interp_fdpic_loadmap; +#endif } mm_context_t; #endif -- cgit