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

[ynorov@caviumnetworks.com (Yury Norov)]

On Thu, May 26, 2016 at 09:49:42PM +0800, Zhangjian (Bamvor) wrote:
> 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 --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:
> -- 
> 1.8.4.5
> 
> 
> On 2016/5/24 8:04, Yury Norov wrote:
> >to handle ILP32 binaries
> >
> >Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
> >---
> >  arch/arm64/kernel/Makefile       |  1 +
> >  arch/arm64/kernel/binfmt_ilp32.c | 91 ++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 92 insertions(+)
> >  create mode 100644 arch/arm64/kernel/binfmt_ilp32.c
> >
> >diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> >index 6bc9738..9dfdf86 100644
> >--- a/arch/arm64/kernel/Makefile
> >+++ b/arch/arm64/kernel/Makefile
> >@@ -28,6 +28,7 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
> >  arm64-obj-$(CONFIG_AARCH32_EL0)		+= sys32.o kuser32.o signal32.o 	\
> >  					   sys_compat.o entry32.o		\
> >  					   ../../arm/kernel/opcodes.o binfmt_elf32.o
> >+arm64-obj-$(CONFIG_ARM64_ILP32)		+= binfmt_ilp32.o
> >  arm64-obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o entry-ftrace.o
> >  arm64-obj-$(CONFIG_MODULES)		+= arm64ksyms.o module.o
> >  arm64-obj-$(CONFIG_ARM64_MODULE_PLTS)	+= module-plts.o
> >diff --git a/arch/arm64/kernel/binfmt_ilp32.c b/arch/arm64/kernel/binfmt_ilp32.c
> >new file mode 100644
> >index 0000000..a934fd4
> >--- /dev/null
> >+++ b/arch/arm64/kernel/binfmt_ilp32.c
> >@@ -0,0 +1,91 @@
> >+/*
> >+ * Support for ILP32 Linux/aarch64 ELF binaries.
> >+ */
> >+
> >+#include <linux/elfcore-compat.h>
> >+#include <linux/time.h>
> >+
> >+#undef	ELF_CLASS
> >+#define ELF_CLASS	ELFCLASS32
> >+
> >+#undef	elfhdr
> >+#undef	elf_phdr
> >+#undef	elf_shdr
> >+#undef	elf_note
> >+#undef	elf_addr_t
> >+#define elfhdr		elf32_hdr
> >+#define elf_phdr	elf32_phdr
> >+#define elf_shdr	elf32_shdr
> >+#define elf_note	elf32_note
> >+#define elf_addr_t	Elf32_Addr
> >+
> >+/*
> >+ * Some data types as stored in coredump.
> >+ */
> >+#define user_long_t		compat_long_t
> >+#define user_siginfo_t		compat_siginfo_t
> >+#define copy_siginfo_to_user	copy_siginfo_to_user32
> >+
> >+/*
> >+ * 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 elf_prstatus	compat_elf_prstatus
> >+#define elf_prpsinfo	compat_elf_prpsinfo
> >+
> >+/*
> >+ * Compat version of cputime_to_compat_timeval, perhaps this
> >+ * should be an inline in <linux/compat.h>.
> >+ */
> >+static void cputime_to_compat_timeval(const cputime_t cputime,
> >+				      struct compat_timeval *value)
> >+{
> >+	struct timeval tv;
> >+	cputime_to_timeval(cputime, &tv);
> >+	value->tv_sec = tv.tv_sec;
> >+	value->tv_usec = tv.tv_usec;
> >+}
> >+
> >+#undef cputime_to_timeval
> >+#define cputime_to_timeval cputime_to_compat_timeval
> >+
> >+/* AARCH64 ILP32 EABI. */
> >+#undef elf_check_arch
> >+#define elf_check_arch(x)		(((x)->e_machine == EM_AARCH64)	\
> >+					&& (x)->e_ident[EI_CLASS] == ELFCLASS32)
> >+
> >+#undef SET_PERSONALITY
> >+#define SET_PERSONALITY(ex)						\
> >+do {									\
> >+	set_thread_flag(TIF_32BIT_AARCH64);				\
> >+	clear_thread_flag(TIF_32BIT);					\
> >+} while (0)
> >+
> >+#undef ARCH_DLINFO
> >+#define ARCH_DLINFO							\
> >+do {									\
> >+	NEW_AUX_ENT(AT_SYSINFO_EHDR,					\
> >+		    (elf_addr_t)(long)current->mm->context.vdso);	\
> >+} while (0)
> >+
> >+#ifdef __AARCH64EB__
> >+#define COMPAT_ELF_PLATFORM		("aarch64_be:ilp32")
> >+#else
> >+#define COMPAT_ELF_PLATFORM		("aarch64:ilp32")
> >+#endif
> >+
> >+#undef ELF_HWCAP
> >+#undef ELF_HWCAP2
> >+#define ELF_HWCAP			((u32) elf_hwcap)
> >+#define ELF_HWCAP2			((u32) (elf_hwcap >> 32))
> >+
> >+/*
> >+ * Rename a few of the symbols that binfmt_elf.c will define.
> >+ * These are all local so the names don't really matter, but it
> >+ * might make some debugging less confusing not to duplicate them.
> >+ */
> >+#define elf_format		compat_elf_format
> >+#define init_elf_binfmt		init_compat_elf_binfmt
> >+#define exit_elf_binfmt		exit_compat_elf_binfmt
> >+
> >+#include "../../../fs/binfmt_elf.c"
> >

Thank you, I'll apply it