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    Subject[PATCH/RFC] FDPIC: add hook for arches to customize program header parsing
    Date
    From: Jie Zhang <jie.zhang@analog.com>

    The Blackfin port has custom program header flags/addresses for
    automatically loading regions into the dedicated on-chip SRAM. So add a
    hook for ports to leverage.

    Signed-off-by: Jie Zhang <jie.zhang@analog.com>
    Signed-off-by: Mike Frysinger <vapier@gentoo.org>
    CC: Bernd Schmidt <bernds_cb1@t-online.de>
    ---
    arch/blackfin/include/asm/elf.h | 8 +++
    arch/blackfin/kernel/Makefile | 1 +
    arch/blackfin/kernel/binfmt_elf_fdpic.c | 80 +++++++++++++++++++++++++++++++
    fs/binfmt_elf_fdpic.c | 7 +++
    4 files changed, 96 insertions(+), 0 deletions(-)
    create mode 100644 arch/blackfin/kernel/binfmt_elf_fdpic.c

    diff --git a/arch/blackfin/include/asm/elf.h b/arch/blackfin/include/asm/elf.h
    index 230e160..aba2506 100644
    --- a/arch/blackfin/include/asm/elf.h
    +++ b/arch/blackfin/include/asm/elf.h
    @@ -124,4 +124,12 @@ do { \

    #define SET_PERSONALITY(ex) set_personality(PER_LINUX)

    +struct mm_struct;
    +struct elf_fdpic_params;
    +struct elf32_phdr;
    +extern int elf_fdpic_plat_process_phdr(struct mm_struct *, struct elf_fdpic_params *,
    + struct elf32_phdr *, unsigned long *, unsigned long *);
    +#define ELF_FDPIC_PLAT_PROCESS_PHDR(mm, params, phdr, maddr, disp) \
    + elf_fdpic_plat_process_phdr(mm, params, phdr, maddr, disp)
    +
    #endif
    diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
    index fd4d432..71c2291 100644
    --- a/arch/blackfin/kernel/Makefile
    +++ b/arch/blackfin/kernel/Makefile
    @@ -15,6 +15,7 @@ else
    obj-y += time.o
    endif

    +obj-$(CONFIG_BINFMT_ELF_FDPIC) += binfmt_elf_fdpic.o
    obj-$(CONFIG_IPIPE) += ipipe.o
    obj-$(CONFIG_IPIPE_TRACE_MCOUNT) += mcount.o
    obj-$(CONFIG_BFIN_GPTIMERS) += gptimers.o
    diff --git a/arch/blackfin/kernel/binfmt_elf_fdpic.c b/arch/blackfin/kernel/binfmt_elf_fdpic.c
    new file mode 100644
    index 0000000..d8192cf
    --- /dev/null
    +++ b/arch/blackfin/kernel/binfmt_elf_fdpic.c
    @@ -0,0 +1,80 @@
    +/*
    + * FDPIC ELF hooks
    + *
    + * Copyright (c) 2006-2009 Analog Devices Inc.
    + * Licensed under the GPL-2 or later.
    + */
    +
    +#include <linux/mm.h>
    +#include <linux/elf.h>
    +#include <linux/elf-fdpic.h>
    +#include <linux/kernel.h>
    +
    +#include <asm/cacheflush.h>
    +#include <asm/dma.h>
    +
    +int elf_fdpic_plat_process_phdr(struct mm_struct *mm,
    + struct elf_fdpic_params *params,
    + struct elf32_phdr *phdr,
    + unsigned long *maddr, unsigned long *disp)
    +{
    + /* 0xfeb00000, 0xfec00000, 0xff700000, 0xff800000, 0xff900000
    + * and 0xffa00000 are also used in Dynamic linker and GNU ld.
    + * They need to be kept synchronized.
    + */
    + unsigned long flag = 0;
    + const char *type = NULL;
    +
    + unsigned int e_flags = params->hdr.e_flags;
    + unsigned long p_vaddr = phdr->p_vaddr;
    + unsigned long p_flags = phdr->p_flags;
    +
    + if (((e_flags & EF_BFIN_CODE_IN_L1) || p_vaddr == 0xffa00000) &&
    + (p_flags & (PF_W | PF_X)) == PF_X)
    + {
    + flag = L1_INST_SRAM;
    + type = "L1 instruction";
    +
    + } else if (((e_flags & EF_BFIN_DATA_IN_L1) ||
    + p_vaddr == 0xff700000 ||
    + p_vaddr == 0xff800000 ||
    + p_vaddr == 0xff900000) &&
    + (p_flags & (PF_X | PF_W)) == PF_W)
    + {
    + if (p_vaddr == 0xff800000) {
    + flag = L1_DATA_A_SRAM;
    + type = "L1 Data A";
    + } else if (p_vaddr == 0xff900000) {
    + flag = L1_DATA_B_SRAM;
    + type = "L1 Data B";
    + } else {
    + flag = L1_DATA_SRAM;
    + type = "L1 Data";
    + }
    +
    + } else if (p_vaddr == 0xfeb00000 || p_vaddr == 0xfec00000) {
    + flag = L2_SRAM;
    + type = "L2";
    + }
    +
    + if (flag) {
    + void *sram_addr = sram_alloc_with_lsl(phdr->p_memsz, flag);
    + if (sram_addr == NULL) {
    + printk(KERN_ERR "elf_fdpic: not enough %s sram\n", type);
    + return -ENOMEM;
    + }
    +
    + if (flag & L1_INST_SRAM)
    + safe_dma_memcpy(sram_addr, (const void *)(*maddr + *disp), phdr->p_memsz);
    + else
    + memcpy(sram_addr, (const void *)(*maddr + *disp), phdr->p_memsz);
    +
    + down_write(&mm->mmap_sem);
    + do_munmap(mm, *maddr, phdr->p_memsz + *disp);
    + up_write(&mm->mmap_sem);
    + *maddr = (unsigned long)sram_addr;
    + *disp = 0;
    + }
    +
    + return 0;
    +}
    diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
    index fdb66fa..1bad16c 100644
    --- a/fs/binfmt_elf_fdpic.c
    +++ b/fs/binfmt_elf_fdpic.c
    @@ -1105,6 +1105,13 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
    ELF_FDPIC_FLAG_CONTIGUOUS)
    load_addr += PAGE_ALIGN(phdr->p_memsz + disp);

    +#ifndef ELF_FDPIC_PLAT_PROCESS_PHDR
    +# define ELF_FDPIC_PLAT_PROCESS_PHDR(mm, params, phdr, maddr, disp) 0
    +#endif
    + ret = ELF_FDPIC_PLAT_PROCESS_PHDR(mm, params, phdr, &maddr, &disp);
    + if (ret)
    + return ret;
    +
    seg->addr = maddr + disp;
    seg->p_vaddr = phdr->p_vaddr;
    seg->p_memsz = phdr->p_memsz;
    --
    1.6.3.1


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