linux-kernel - [PATCH 08/19] elf_core_copy_extra

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Date:	Fri, 04 Oct 2013 16:01:41 +0530
From:	Janani Venkataraman <jananive@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	amwang@...hat.com, rdunlap@...otime.net, andi@...stfloor.org,
	aravinda@...ux.vnet.ibm.com, hch@....de, mhiramat@...hat.com,
	jeremy.fitzhardinge@...rix.com, xemul@...allels.com,
	suzuki@...ux.vnet.ibm.com, kosaki.motohiro@...fujitsu.com,
	adobriyan@...il.com, tarundsk@...ux.vnet.ibm.com,
	vapier@...too.org, roland@...k.frob.com, tj@...nel.org,
	ananth@...ux.vnet.ibm.com, gorcunov@...nvz.org, avagin@...nvz.org,
	oleg@...hat.com, eparis@...hat.com, d.hatayama@...fujitsu.com,
	james.hogan@...tec.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH 08/19] elf_core_copy_extra_phdrs() for UML

From:Suzuki K. Poulose <suzuki@...ibm.com>

elf_core_copy_extra_phdrs() for UML. Adapted from elf_core_write_extra_phdrs()

Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
---
 arch/x86/um/elfcore.c |   32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/x86/um/elfcore.c b/arch/x86/um/elfcore.c
index 6bb49b6..edecfce 100644
--- a/arch/x86/um/elfcore.c
+++ b/arch/x86/um/elfcore.c
@@ -41,6 +41,38 @@ int elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
 	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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