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- #include <linux/export.h>
- #include <linux/sched.h>
- #include <linux/personality.h>
- #include <linux/binfmts.h>
- #include <linux/elf.h>
- #include <asm/system_info.h>
- int elf_check_arch(const struct elf32_hdr *x)
- {
- unsigned int eflags;
- /* Make sure it's an ARM executable */
- if (x->e_machine != EM_ARM)
- return 0;
- /* Make sure the entry address is reasonable */
- if (x->e_entry & 1) {
- if (!(elf_hwcap & HWCAP_THUMB))
- return 0;
- } else if (x->e_entry & 3)
- return 0;
- eflags = x->e_flags;
- if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
- unsigned int flt_fmt;
- /* APCS26 is only allowed if the CPU supports it */
- if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT))
- return 0;
- flt_fmt = eflags & (EF_ARM_VFP_FLOAT | EF_ARM_SOFT_FLOAT);
- /* VFP requires the supporting code */
- if (flt_fmt == EF_ARM_VFP_FLOAT && !(elf_hwcap & HWCAP_VFP))
- return 0;
- }
- return 1;
- }
- EXPORT_SYMBOL(elf_check_arch);
- void elf_set_personality(const struct elf32_hdr *x)
- {
- unsigned int eflags = x->e_flags;
- unsigned int personality = current->personality & ~PER_MASK;
- /*
- * We only support Linux ELF executables, so always set the
- * personality to LINUX.
- */
- personality |= PER_LINUX;
- /*
- * APCS-26 is only valid for OABI executables
- */
- if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN &&
- (eflags & EF_ARM_APCS_26))
- personality &= ~ADDR_LIMIT_32BIT;
- else
- personality |= ADDR_LIMIT_32BIT;
- set_personality(personality);
- /*
- * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
- * and CP1, we only enable access to the iWMMXt coprocessor if the
- * binary is EABI or softfloat (and thus, guaranteed not to use
- * FPA instructions.)
- */
- if (elf_hwcap & HWCAP_IWMMXT &&
- eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) {
- set_thread_flag(TIF_USING_IWMMXT);
- } else {
- clear_thread_flag(TIF_USING_IWMMXT);
- }
- }
- EXPORT_SYMBOL(elf_set_personality);
- /*
- * Set READ_IMPLIES_EXEC if:
- * - the binary requires an executable stack
- * - we're running on a CPU which doesn't support NX.
- */
- int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack)
- {
- if (executable_stack != EXSTACK_DISABLE_X)
- return 1;
- if (cpu_architecture() < CPU_ARCH_ARMv6)
- return 1;
- return 0;
- }
- EXPORT_SYMBOL(arm_elf_read_implies_exec);
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