diff mbox

[16/23] arm64: ilp32: introduce binfmt_ilp32.c

Message ID 5746FEF6.9070405@huawei.com
State New
Headers show

Commit Message

Zhang Jian(Bamvor) May 26, 2016, 1:49 p.m. UTC
Hi, yury

The coredump is usable in our platform. It miss the following definition:
+#define compat_elf_greg_t	elf_greg_t
+#define compat_elf_gregset_t	elf_gregset_t

And it leads to the wrong register save in core dump. After apply this patch,
gdb could debug core dump files.

Here is the full patch:
 From 102624840aa5dacdd1bbfe3b390290f52f530ea2 Mon Sep 17 00:00:00 2001
From: Bamvor Jian Zhang <bamvor.zhangjian@huawei.com>
Date: Thu, 26 May 2016 21:00:16 +0800
Subject: [PATCH hulk-4.1-next] arm64: ilp32: fix coredump issue

ILP32 use aarch64 register and 32bit signal struct which means it
could not make use of the existing compat_elf_prstatus/elf_prstatus
and compat_elf_prpsinfo/elf_prpsinfo.

This patch fix this issue by introducing the different
compat_elf_greg_t, compat_elf_gregset_t for aarch64 ilp32 and aarch32
el0.

Tested pass on huawei's hardware in bigendian.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@huawei.com>
---
  arch/arm64/include/asm/elf.h     | 14 +++++++-------
  arch/arm64/kernel/binfmt_elf32.c |  3 +++
  arch/arm64/kernel/binfmt_ilp32.c |  8 +++++++-
  arch/arm64/kernel/ptrace.c       | 20 ++++++++++----------
  4 files changed, 27 insertions(+), 18 deletions(-)
diff mbox

Patch

diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h
index 0106d18..9019441 100644
--- a/arch/arm64/include/asm/elf.h
+++ b/arch/arm64/include/asm/elf.h
@@ -154,18 +154,18 @@  extern int arch_setup_additional_pages(struct linux_binprm *bprm,
  				       int uses_interp);

  /* 1GB of VA */
-#define STACK_RND_MASK			(is_compat_task() ? \
-						0x7ff >> (PAGE_SHIFT - 12) : \
-						0x3ffff >> (PAGE_SHIFT - 12))
+#define STACK_RND_MASK		(is_compat_task() ? \
+					0x7ff >> (PAGE_SHIFT - 12) : \
+					0x3ffff >> (PAGE_SHIFT - 12))

  #ifdef CONFIG_COMPAT

-#define COMPAT_ELF_ET_DYN_BASE		(2 * TASK_SIZE_32 / 3)
+#define COMPAT_ELF_ET_DYN_BASE	(2 * TASK_SIZE_32 / 3)

  /* AArch32 registers. */
-#define COMPAT_ELF_NGREG		18
-typedef unsigned int			compat_elf_greg_t;
-typedef compat_elf_greg_t		compat_elf_gregset_t[COMPAT_ELF_NGREG];
+#define COMPAT_ELF_NGREG	18
+typedef unsigned int		compat_a32_elf_greg_t;
+typedef compat_a32_elf_greg_t	compat_a32_elf_gregset_t[COMPAT_ELF_NGREG];

  #endif /* CONFIG_COMPAT */

diff --git a/arch/arm64/kernel/binfmt_elf32.c b/arch/arm64/kernel/binfmt_elf32.c
index 7b9b445..f75253c 100644
--- a/arch/arm64/kernel/binfmt_elf32.c
+++ b/arch/arm64/kernel/binfmt_elf32.c
@@ -31,4 +31,7 @@  struct linux_binprm;
  extern int aarch32_setup_vectors_page(struct linux_binprm *bprm,
  				      int uses_interp);

+#define compat_elf_greg_t	compat_a32_elf_greg_t
+#define compat_elf_gregset_t	compat_a32_elf_gregset_t
+
  #include "../../../fs/compat_binfmt_elf.c"
diff --git a/arch/arm64/kernel/binfmt_ilp32.c b/arch/arm64/kernel/binfmt_ilp32.c
index b827a9a..01baf83 100644
--- a/arch/arm64/kernel/binfmt_ilp32.c
+++ b/arch/arm64/kernel/binfmt_ilp32.c
@@ -2,7 +2,9 @@ 
   * Support for ILP32 Linux/aarch64 ELF binaries.
   */

-#include <linux/elfcore-compat.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
+#include <linux/compat.h>
  #include <linux/time.h>

  #undef	ELF_CLASS
@@ -30,9 +32,13 @@ 
   * The machine-dependent core note format types are defined in elfcore-compat.h,
   * which requires asm/elf.h to define compat_elf_gregset_t et al.
   */
+#define compat_elf_greg_t	elf_greg_t
+#define compat_elf_gregset_t	elf_gregset_t
  #define elf_prstatus	compat_elf_prstatus
  #define elf_prpsinfo	compat_elf_prpsinfo

+#include <linux/elfcore-compat.h>
+
  /*
   * Compat version of cputime_to_compat_timeval, perhaps this
   * should be an inline in <linux/compat.h>.
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 5c86135..9784c77 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -913,8 +913,8 @@  static const struct user_regset aarch32_regsets[] = {
  	[REGSET_COMPAT_GPR] = {
  		.core_note_type = NT_PRSTATUS,
  		.n = COMPAT_ELF_NGREG,
-		.size = sizeof(compat_elf_greg_t),
-		.align = sizeof(compat_elf_greg_t),
+		.size = sizeof(compat_a32_elf_greg_t),
+		.align = sizeof(compat_a32_elf_greg_t),
  		.get = compat_gpr_get,
  		.set = compat_gpr_set
  	},
@@ -947,7 +947,7 @@  static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
  		tmp = tsk->mm->start_data;
  	else if (off == COMPAT_PT_TEXT_END_ADDR)
  		tmp = tsk->mm->end_code;
-	else if (off < sizeof(compat_elf_gregset_t))
+	else if (off < sizeof(compat_a32_elf_gregset_t))
  		return copy_regset_to_user(tsk, &user_aarch32_view,
  					   REGSET_COMPAT_GPR, off,
  					   sizeof(compat_ulong_t), ret);
@@ -968,7 +968,7 @@  static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
  	if (off & 3 || off >= COMPAT_USER_SZ)
  		return -EIO;

-	if (off >= sizeof(compat_elf_gregset_t))
+	if (off >= sizeof(compat_a32_elf_gregset_t))
  		return 0;

  	set_fs(KERNEL_DS);
@@ -1116,9 +1116,11 @@  static long compat_a32_ptrace(struct task_struct *child, compat_long_t request,
  	unsigned long addr = caddr;
  	unsigned long data = cdata;
  	void __user *datap = compat_ptr(data);
+	unsigned int pr_reg_size = sizeof(compat_a32_elf_gregset_t);
  	int ret;

  	switch (request) {
+
  		case PTRACE_PEEKUSR:
  			ret = compat_ptrace_read_user(child, addr, datap);
  			break;
@@ -1130,17 +1132,15 @@  static long compat_a32_ptrace(struct task_struct *child, compat_long_t request,
  		case COMPAT_PTRACE_GETREGS:
  			ret = copy_regset_to_user(child,
  						  &user_aarch32_view,
-						  REGSET_COMPAT_GPR,
-						  0, sizeof(compat_elf_gregset_t),
-						  datap);
+						  REGSET_COMPAT_GPR, 0,
+						  pr_reg_size, datap);
  			break;

  		case COMPAT_PTRACE_SETREGS:
  			ret = copy_regset_from_user(child,
  						    &user_aarch32_view,
-						    REGSET_COMPAT_GPR,
-						    0, sizeof(compat_elf_gregset_t),
-						    datap);
+						    REGSET_COMPAT_GPR, 0,
+						    pr_reg_size, datap);
  			break;

  		case COMPAT_PTRACE_GET_THREAD_AREA: