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Re: [PATCH 0/2] Support for FreeBSD/mips N32
On Tuesday, September 19, 2017 09:24:57 PM John Baldwin wrote:
> On Wednesday, September 20, 2017 11:31:05 AM Alan Modra wrote:
> > On Tue, Sep 19, 2017 at 01:48:12PM -0700, John Baldwin wrote:
> > > The first patch to bfd/elf.c might be too hackish.
> >
> > Yeah, I dislike the inclusion of mips.h in elf.c.
> >
> > > Not sure if adding a
> > > new 'bed' method for 'grok_freebsd_prstatus' is a better approach?
> >
> > Yes please.
>
> Ok, how about this:
>
> From 5a2f8adf9d03f0cb80d9bcc849150936bfd64687 Mon Sep 17 00:00:00 2001
> From: John Baldwin <jhb@FreeBSD.org>
> Date: Mon, 18 Sep 2017 11:42:47 -0700
> Subject: [PATCH v2 1/2] Account for padding in FreeBSD/mipsn32 NT_PRSTATUS
> notes.
> To: gdb-patches@sourceware.org,
> binutils@sourceware.org
>
> Add a new ELF backend method to grok FreeBSD NT_PRSTATUS core dump
> notes. Define a method for MIPS N32 to override the default
> elfcore_grok_freebsd_prstatus that accounts for additional padding
> between pr_pid and pr_reg that is not present in other 32-bit FreeBSD
> platforms.
>
> * elf-bfd.h (struct elf_backend_data): Add
> `elf_backend_grok_freebsd_prstatus'.
> * elf.c (elfcore_grok_freebsd_note): Call
> `elf_backend_grok_freebsd_prstatus' to handle NT_PRSTATUS if
> present.
> * elfn32-mips.c (elf_n32_mips_grok_freebsd_prstatus): New
> function.
> (elf_backend_grok_freebsd_prstatus): Define.
> * elfxx-target.h (elf_backend_grok_freebsd_prstatus): Define.
> (elfNN_bed): Initialize `elf_backend_grok_freebsd_prstatus'.
> ---
> bfd/ChangeLog | 13 +++++++++++++
> bfd/elf-bfd.h | 5 +++++
> bfd/elf.c | 5 +++++
> bfd/elfn32-mips.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> bfd/elfxx-target.h | 4 ++++
> 5 files changed, 81 insertions(+)
>
> diff --git a/bfd/ChangeLog b/bfd/ChangeLog
> index 4c8c12cd46..033a634f28 100644
> --- a/bfd/ChangeLog
> +++ b/bfd/ChangeLog
> @@ -1,3 +1,16 @@
> +2017-09-19 John Baldwin <jhb@FreeBSD.org>
> +
> + * elf-bfd.h (struct elf_backend_data): Add
> + `elf_backend_grok_freebsd_prstatus'.
> + * elf.c (elfcore_grok_freebsd_note): Call
> + `elf_backend_grok_freebsd_prstatus' to handle NT_PRSTATUS if
> + present.
> + * elfn32-mips.c (elf_n32_mips_grok_freebsd_prstatus): New
> + function.
> + (elf_backend_grok_freebsd_prstatus): Define.
> + * elfxx-target.h (elf_backend_grok_freebsd_prstatus): Define.
> + (elfNN_bed): Initialize `elf_backend_grok_freebsd_prstatus'.
> +
> 2017-09-19 Alan Modra <amodra@gmail.com>
>
> PR 21441
> diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
> index fd08748ae2..399e298a8d 100644
> --- a/bfd/elf-bfd.h
> +++ b/bfd/elf-bfd.h
> @@ -1270,6 +1270,11 @@ struct elf_backend_data
> bfd_boolean (*elf_backend_grok_psinfo)
> (bfd *, Elf_Internal_Note *);
>
> + /* This function, if defined, is called when a "FreeBSD" NT_PRSTATUS
> + note is found in a core file. */
> + bfd_boolean (*elf_backend_grok_freebsd_prstatus)
> + (bfd *, Elf_Internal_Note *);
> +
> /* This function, if defined, is called to write a note to a corefile. */
> char *(*elf_backend_write_core_note)
> (bfd *abfd, char *buf, int *bufsiz, int note_type, ...);
> diff --git a/bfd/elf.c b/bfd/elf.c
> index 2aa2337724..428506f862 100644
> --- a/bfd/elf.c
> +++ b/bfd/elf.c
> @@ -9970,9 +9970,14 @@ elfcore_grok_freebsd_prstatus (bfd *abfd, Elf_Internal_Note *note)
> static bfd_boolean
> elfcore_grok_freebsd_note (bfd *abfd, Elf_Internal_Note *note)
> {
> + const struct elf_backend_data *bed = get_elf_backend_data (abfd);
> +
> switch (note->type)
> {
> case NT_PRSTATUS:
> + if (bed->elf_backend_grok_freebsd_prstatus)
> + if ((*bed->elf_backend_grok_freebsd_prstatus) (abfd, note))
> + return TRUE;
> return elfcore_grok_freebsd_prstatus (abfd, note);
>
> case NT_FPREGSET:
> diff --git a/bfd/elfn32-mips.c b/bfd/elfn32-mips.c
> index dce7ba1c7a..a8ccedaefc 100644
> --- a/bfd/elfn32-mips.c
> +++ b/bfd/elfn32-mips.c
> @@ -80,6 +80,8 @@ static bfd_boolean elf32_mips_grok_prstatus
> (bfd *, Elf_Internal_Note *);
> static bfd_boolean elf32_mips_grok_psinfo
> (bfd *, Elf_Internal_Note *);
> +static bfd_boolean elf_n32_mips_grok_freebsd_prstatus
> + (bfd *, Elf_Internal_Note *);
> static irix_compat_t elf_n32_mips_irix_compat
> (bfd *);
>
> @@ -3578,6 +3580,56 @@ elf32_mips_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
>
> return TRUE;
> }
> +
> +static bfd_boolean
> +elf_n32_mips_grok_freebsd_prstatus (bfd *abfd, Elf_Internal_Note *note)
> +{
> + size_t offset;
> + size_t size;
> + size_t min_size;
> +
> + /* Compute offset of pr_getregsz, skipping over pr_statussz.
> + Also compute minimum size of this note. */
> + offset = 4 + 4;
> + min_size = offset + (4 * 2) + 4 + 4 + 4;
> +
> + if (note->descsz < min_size)
> + return FALSE;
> +
> + /* Check for version 1 in pr_version. */
> + if (bfd_h_get_32 (abfd, (bfd_byte *) note->descdata) != 1)
> + return FALSE;
> +
> + /* Extract size of pr_reg from pr_gregsetsz. */
> + /* Skip over pr_gregsetsz and pr_fpregsetsz. */
> + size = bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + offset);
> + offset += 4 * 2;
> +
> + /* Skip over pr_osreldate. */
> + offset += 4;
> +
> + /* Read signal from pr_cursig. */
> + if (elf_tdata (abfd)->core->signal == 0)
> + elf_tdata (abfd)->core->signal
> + = bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + offset);
> + offset += 4;
> +
> + /* Read TID from pr_pid. */
> + elf_tdata (abfd)->core->lwpid
> + = bfd_h_get_32 (abfd, (bfd_byte *) note->descdata + offset);
> + offset += 4;
> +
> + /* Padding before pr_reg. */
> + offset += 4;
> +
> + /* Make sure that there is enough data remaining in the note. */
> + if ((note->descsz - offset) < size)
> + return FALSE;
> +
> + /* Make a ".reg/999" section and a ".reg" section. */
> + return _bfd_elfcore_make_pseudosection (abfd, ".reg",
> + size, note->descpos + offset);
> +}
>
> /* Depending on the target vector we generate some version of Irix
> executables or "normal" MIPS ELF ABI executables. */
> @@ -3684,6 +3736,8 @@ static const struct ecoff_debug_swap mips_elf32_ecoff_debug_swap = {
> _bfd_mips_elf_copy_indirect_symbol
> #define elf_backend_grok_prstatus elf32_mips_grok_prstatus
> #define elf_backend_grok_psinfo elf32_mips_grok_psinfo
> +#define elf_backend_grok_freebsd_prstatus \
> + elf_n32_mips_grok_freebsd_prstatus
> #define elf_backend_ecoff_debug_swap &mips_elf32_ecoff_debug_swap
>
> #define elf_backend_got_header_size (4 * MIPS_RESERVED_GOTNO)
> diff --git a/bfd/elfxx-target.h b/bfd/elfxx-target.h
> index 551883fa09..6efca84e4e 100644
> --- a/bfd/elfxx-target.h
> +++ b/bfd/elfxx-target.h
> @@ -597,6 +597,9 @@
> #ifndef elf_backend_grok_psinfo
> #define elf_backend_grok_psinfo NULL
> #endif
> +#ifndef elf_backend_grok_freebsd_prstatus
> +#define elf_backend_grok_freebsd_prstatus NULL
> +#endif
> #ifndef elf_backend_write_core_note
> #define elf_backend_write_core_note NULL
> #endif
> @@ -820,6 +823,7 @@ static struct elf_backend_data elfNN_bed =
> elf_backend_sort_relocs_p,
> elf_backend_grok_prstatus,
> elf_backend_grok_psinfo,
> + elf_backend_grok_freebsd_prstatus,
> elf_backend_write_core_note,
> elf_backend_lookup_section_flags_hook,
> elf_backend_reloc_type_class,
>
Ping?
--
John Baldwin