From: Andrew Pinski <apin...@cavium.com> This patch supports core dumping on ILP32. We need a few extra macros (COMPAT_PR_REG_SIZE and COMPAT_PRSTATUS_SIZE) due to size differences of the register sets.
Signed-off-by: Philipp Tomsich <philipp.toms...@theobroma-systems.com> Signed-off-by: Christoph Muellner <christoph.muell...@theobroma-systems.com> Signed-off-by: Yury Norov <yno...@caviumnetworks.com> Signed-off-by: Andrew Pinski <andrew.pin...@caviumnetworks.com> Reviewed-by: David Daney <david.da...@cavium.com> --- arch/arm64/include/asm/elf.h | 87 ++++++++++++++++++++++++++++++++++++++------ arch/arm64/kernel/ptrace.c | 12 +++--- arch/arm64/kernel/vdso.c | 8 ++++ 3 files changed, 89 insertions(+), 18 deletions(-) diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index 01e032c..8f13dac 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -134,7 +134,11 @@ typedef struct user_fpsimd_state elf_fpregset_t; */ #define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0 -#define SET_PERSONALITY(ex) clear_thread_flag(TIF_32BIT); +#define SET_PERSONALITY(ex) \ +do { \ + clear_thread_flag(TIF_32BIT_AARCH64); \ + clear_thread_flag(TIF_32BIT); \ +} while (0) #define ARCH_DLINFO \ do { \ @@ -166,12 +170,15 @@ extern int arch_setup_additional_pages(struct linux_binprm *bprm, #define COMPAT_ELF_ET_DYN_BASE (2 * TASK_SIZE_32 / 3) +extern int aarch32_setup_vectors_page(struct linux_binprm *bprm, + int uses_interp); + #ifdef CONFIG_AARCH32_EL0 /* AArch32 registers. */ #define COMPAT_A32_ELF_NGREG 18 -typedef unsigned int compat_elf_greg_t; -typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_A32_ELF_NGREG]; +typedef unsigned int compat_a32_elf_greg_t; +typedef compat_a32_elf_greg_t compat_a32_elf_gregset_t[COMPAT_A32_ELF_NGREG]; /* AArch32 EABI. */ #define EF_ARM_EABI_MASK 0xff000000 @@ -179,24 +186,80 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_A32_ELF_NGREG]; ((x)->e_flags & EF_ARM_EABI_MASK)) #define compat_start_thread compat_start_thread -#define COMPAT_SET_PERSONALITY(ex) set_thread_flag(TIF_32BIT); -#define COMPAT_ARCH_DLINFO -extern int aarch32_setup_vectors_page(struct linux_binprm *bprm, - int uses_interp); -#define compat_arch_setup_additional_pages \ - aarch32_setup_vectors_page +#define COMPAT_A32_SET_PERSONALITY(ex) \ +do { \ + clear_thread_flag(TIF_32BIT_AARCH64); \ + set_thread_flag(TIF_32BIT); \ +} while (0) +#define COMPAT_A32_ARCH_DLINFO do {} while (0) #else typedef elf_greg_t compat_elf_greg_t; typedef elf_gregset_t compat_elf_gregset_t; #define compat_a32_elf_check_arch(x) 0 -#define COMPAT_SET_PERSONALITY(ex) -#define COMPAT_ARCH_DLINFO +#define COMPAT_A32_SET_PERSONALITY(ex) do {} while (0) +#define COMPAT_A32_ARCH_DLINFO do {} while (0) +#endif + +/* If ILP32 is turned on, we want to define the compat_elf_greg_t to the non compat + one and define PR_REG_SIZE/PRSTATUS_SIZE/SET_PR_FPVALID so we pick up the correct + ones for AARCH32. Note also the definition of the macros have to be correct for + LP64 as this file is included in the standard binfmt_elf.c. */ +#ifdef CONFIG_ARM64_ILP32 +typedef elf_greg_t compat_elf_greg_t; +typedef elf_gregset_t compat_elf_gregset_t; +#define PR_REG_SIZE(S) (is_a32_compat_task() ? 72 : 272) +#define PRSTATUS_SIZE(S) (is_a32_compat_task() ? 124 : (is_ilp32_compat_task() ? 352 : 392)) +#define SET_PR_FPVALID(S, V) \ +do { \ + *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE((S)->pr_reg)) = (V); \ +} while (0) +#else +typedef compat_a32_elf_greg_t compat_elf_greg_t; +typedef compat_a32_elf_gregset_t compat_elf_gregset_t; +#endif +#ifdef CONFIG_ARM64_ILP32 +#define compat_ilp32_elf_check_arch(x) ((x)->e_machine == EM_AARCH64) +#define COMPAT_ILP32_SET_PERSONALITY(ex) \ +do { \ + set_thread_flag(TIF_32BIT_AARCH64); \ + clear_thread_flag(TIF_32BIT); \ +} while (0) +#define COMPAT_ILP32_ARCH_DLINFO \ +do { \ + NEW_AUX_ENT(AT_SYSINFO_EHDR, \ + (elf_addr_t)(long)current->mm->context.vdso); \ +} while (0) +#else +#define compat_ilp32_elf_check_arch(x) 0 +#define COMPAT_ILP32_SET_PERSONALITY(ex) do {} while (0) +#define COMPAT_ILP32_ARCH_DLINFO do {} while (0) #endif -#define compat_elf_check_arch(x) compat_a32_elf_check_arch(x) +#define compat_elf_check_arch(x) (compat_a32_elf_check_arch(x) || compat_ilp32_elf_check_arch(x)) +#define COMPAT_SET_PERSONALITY(ex) \ +do { \ + if (compat_a32_elf_check_arch(&ex)) \ + COMPAT_A32_SET_PERSONALITY(ex); \ + else \ + COMPAT_ILP32_SET_PERSONALITY(ex); \ +} while (0) + +/* ILP32 uses the "LP64-like" vdso pages */ +#define compat_arch_setup_additional_pages \ + (is_a32_compat_task() \ + ? &aarch32_setup_vectors_page \ + : &(arch_setup_additional_pages)) + +#define COMPAT_ARCH_DLINFO \ +do { \ + if (is_a32_compat_task()) \ + COMPAT_A32_ARCH_DLINFO; \ + else \ + COMPAT_ILP32_ARCH_DLINFO; \ +} while (0) #endif /* CONFIG_COMPAT */ diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index d2e428c..22d0d5e 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -854,8 +854,8 @@ static const struct user_regset aarch32_regsets[] = { [REGSET_COMPAT_GPR] = { .core_note_type = NT_PRSTATUS, .n = COMPAT_A32_ELF_NGREG, - .size = sizeof(compat_elf_greg_t), - .align = sizeof(compat_elf_greg_t), + .size = sizeof(compat_a32_elf_greg_t), + .align = sizeof(compat_a32_elf_greg_t), .get = compat_gpr_get, .set = compat_gpr_set }, @@ -946,7 +946,7 @@ static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off, tmp = tsk->mm->start_data; else if (off == COMPAT_PT_TEXT_END_ADDR) tmp = tsk->mm->end_code; - else if (off < sizeof(compat_elf_gregset_t)) + else if (off < sizeof(compat_a32_elf_gregset_t)) return copy_regset_to_user(tsk, &user_aarch32_view, REGSET_COMPAT_GPR, off, sizeof(compat_ulong_t), ret); @@ -967,7 +967,7 @@ static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off, if (off & 3 || off >= COMPAT_USER_SZ) return -EIO; - if (off >= sizeof(compat_elf_gregset_t)) + if (off >= sizeof(compat_a32_elf_gregset_t)) return 0; set_fs(KERNEL_DS); @@ -1130,7 +1130,7 @@ long compat_a32_arch_ptrace(struct task_struct *child, compat_long_t request, ret = copy_regset_to_user(child, &user_aarch32_view, REGSET_COMPAT_GPR, - 0, sizeof(compat_elf_gregset_t), + 0, sizeof(compat_a32_elf_gregset_t), datap); break; @@ -1138,7 +1138,7 @@ long compat_a32_arch_ptrace(struct task_struct *child, compat_long_t request, ret = copy_regset_from_user(child, &user_aarch32_view, REGSET_COMPAT_GPR, - 0, sizeof(compat_elf_gregset_t), + 0, sizeof(compat_a32_elf_gregset_t), datap); break; diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c index 26352a6..b239b9b 100644 --- a/arch/arm64/kernel/vdso.c +++ b/arch/arm64/kernel/vdso.c @@ -107,6 +107,14 @@ int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp) return PTR_ERR_OR_ZERO(ret); } +#else +int aarch32_setup_vectors_page(struct linux_binprm *bprm, int uses_interp) +{ + (void) bprm; + (void) uses_interp; + + return -EINVAL; +} #endif /* CONFIG_AARCH32_EL0 */ static struct vm_special_mapping vdso_spec[2]; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/