linux-kernel - [Patch 9/21] UML (i386) Implementation of elf_core_copy_extra

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Message-ID: <20101214153956.1716d261@suzukikp>
Date:	Tue, 14 Dec 2010 15:39:56 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [Patch 9/21] UML (i386) Implementation of
 elf_core_copy_extra_phdrs()

elf_core_copy_extra_phdrs() for UML. Adapted from elf_core_write_extra_phdrs()

Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
---
 arch/um/sys-i386/elfcore.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

Index: linux-2.6.36-rc7/arch/um/sys-i386/elfcore.c
===================================================================
--- linux-2.6.36-rc7.orig/arch/um/sys-i386/elfcore.c
+++ linux-2.6.36-rc7/arch/um/sys-i386/elfcore.c
@@ -41,6 +41,38 @@ int elf_core_write_extra_phdrs(struct fi
 	return 1;
 }
 
+int elf_core_copy_extra_phdrs(char *bufp, loff_t offset, size_t *size,
+				unsigned long limit)
+{
+	if (vsyscall_ehdr) {
+		const struct elfhdr *const ehdrp =
+			(struct elfhdr *) vsyscall_ehdr;
+		const struct elf_phdr *const phdrp =
+			(const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
+		struct elf_phdr *phdr = (struct elf_phdr *)bufp;
+		int i;
+		Elf32_Off ofs = 0;
+
+		for (i = 0; i < ehdrp->e_phnum; ++i) {
+			*size += sizeof(*phdr);
+			if (*size > limit)
+				return 0;
+
+			*phdr = phdrp[i];
+
+			if (phdr.p_type == PT_LOAD) {
+				ofs = phdr.p_offset = offset;
+				offset += phdr.p_filesz;
+			} else {
+				phdr.p_offset += ofs;
+			}
+			phdr.p_paddr = 0; /* match other core phdrs */
+			phdr++;
+		}
+	}
+	return 1;
+}
+
 int elf_core_write_extra_data(struct file *file, size_t *size,
 			      unsigned long limit)
 {
--
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