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ecea4ab6d3
Many of the core ARM kernel files are not modules, but just including module.h for exporting symbols. Now these files can use the lighter footprint export.h for this role. There are probably lots more, but ARM files of mach-* and plat-* don't get coverage via a simple yesconfig build. They will have to be cleaned up and tested via using their respective configs. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/personality.h>
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#include <linux/binfmts.h>
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#include <linux/elf.h>
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int elf_check_arch(const struct elf32_hdr *x)
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{
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unsigned int eflags;
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/* Make sure it's an ARM executable */
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if (x->e_machine != EM_ARM)
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return 0;
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/* Make sure the entry address is reasonable */
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if (x->e_entry & 1) {
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if (!(elf_hwcap & HWCAP_THUMB))
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return 0;
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} else if (x->e_entry & 3)
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return 0;
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eflags = x->e_flags;
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if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
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unsigned int flt_fmt;
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/* APCS26 is only allowed if the CPU supports it */
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if ((eflags & EF_ARM_APCS_26) && !(elf_hwcap & HWCAP_26BIT))
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return 0;
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flt_fmt = eflags & (EF_ARM_VFP_FLOAT | EF_ARM_SOFT_FLOAT);
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/* VFP requires the supporting code */
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if (flt_fmt == EF_ARM_VFP_FLOAT && !(elf_hwcap & HWCAP_VFP))
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return 0;
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}
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return 1;
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}
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EXPORT_SYMBOL(elf_check_arch);
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void elf_set_personality(const struct elf32_hdr *x)
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{
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unsigned int eflags = x->e_flags;
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unsigned int personality = current->personality & ~PER_MASK;
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/*
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* We only support Linux ELF executables, so always set the
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* personality to LINUX.
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*/
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personality |= PER_LINUX;
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/*
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* APCS-26 is only valid for OABI executables
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*/
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if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN &&
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(eflags & EF_ARM_APCS_26))
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personality &= ~ADDR_LIMIT_32BIT;
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else
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personality |= ADDR_LIMIT_32BIT;
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set_personality(personality);
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/*
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* Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
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* and CP1, we only enable access to the iWMMXt coprocessor if the
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* binary is EABI or softfloat (and thus, guaranteed not to use
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* FPA instructions.)
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*/
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if (elf_hwcap & HWCAP_IWMMXT &&
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eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) {
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set_thread_flag(TIF_USING_IWMMXT);
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} else {
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clear_thread_flag(TIF_USING_IWMMXT);
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}
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}
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EXPORT_SYMBOL(elf_set_personality);
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/*
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* Set READ_IMPLIES_EXEC if:
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* - the binary requires an executable stack
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* - we're running on a CPU which doesn't support NX.
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*/
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int arm_elf_read_implies_exec(const struct elf32_hdr *x, int executable_stack)
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{
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if (executable_stack != EXSTACK_DISABLE_X)
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return 1;
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if (cpu_architecture() < CPU_ARCH_ARMv6)
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return 1;
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return 0;
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}
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EXPORT_SYMBOL(arm_elf_read_implies_exec);
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