Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933655AbZFMBB1 (ORCPT ); Fri, 12 Jun 2009 21:01:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753323AbZFMBBU (ORCPT ); Fri, 12 Jun 2009 21:01:20 -0400 Received: from smtp.gentoo.org ([140.211.166.183]:33641 "EHLO smtp.gentoo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752856AbZFMBBT (ORCPT ); Fri, 12 Jun 2009 21:01:19 -0400 From: Mike Frysinger To: uclinux-dev@uclinux.org Cc: linux-kernel@vger.kernel.org, uclinux-dist-devel@blackfin.uclinux.org, David McCullough , Greg Ungerer , Paul Mundt , Jie Zhang , Bernd Schmidt Subject: [PATCH/RFC] FDPIC: add hook for arches to customize program header parsing Date: Fri, 12 Jun 2009 21:01:09 -0400 Message-Id: <1244854869-2563-1-git-send-email-vapier@gentoo.org> X-Mailer: git-send-email 1.6.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5115 Lines: 158 From: Jie Zhang 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 Signed-off-by: Mike Frysinger CC: Bernd Schmidt --- 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 +#include +#include +#include + +#include +#include + +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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/