diff options
| -rw-r--r-- | gdb/ChangeLog | 7 | ||||
| -rw-r--r-- | gdb/fbsd-tdep.c | 68 |
2 files changed, 75 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 02397dfd581..42fdda6f591 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,12 @@ 2017-07-07 John Baldwin <jhb@FreeBSD.org> + * fbsd-tdep.c (LWPINFO_OFFSET, LWPINFO_PL_FLAGS) + (LWPINFO64_PL_SIGINFO, LWPINFO32_PL_SIGINFO, PL_FLAG_SI) + (SIZE64_SIGINFO_T, SIZE32_SIGINFO_T, fbsd_core_xfer_siginfo): New. + (fbsd_init_abi): Install gdbarch "core_xfer_siginfo" method. + +2017-07-07 John Baldwin <jhb@FreeBSD.org> + * fbsd-tdep.c (fbsd_core_thread_name): Use thread_section_name. 2017-07-07 John Baldwin <jhb@FreeBSD.org> diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c index 32df1042080..6f30197a836 100644 --- a/gdb/fbsd-tdep.c +++ b/gdb/fbsd-tdep.c @@ -30,6 +30,28 @@ #include "fbsd-tdep.h" +/* FreeBSD kernels 12.0 and later include a copy of the + 'ptrace_lwpinfo' structure returned by the PT_LWPINFO ptrace + operation in an ELF core note (NT_FREEBSD_PTLWPINFO) for each LWP. + The constants below define the offset of field members and flags in + this structure used by methods in this file. Note that the + 'ptrace_lwpinfo' struct in the note is preceded by a 4 byte integer + containing the size of the structure. */ + +#define LWPINFO_OFFSET 0x4 + +/* Offsets in ptrace_lwpinfo. */ +#define LWPINFO_PL_FLAGS 0x8 +#define LWPINFO64_PL_SIGINFO 0x30 +#define LWPINFO32_PL_SIGINFO 0x2c + +/* Flags in pl_flags. */ +#define PL_FLAG_SI 0x20 /* siginfo is valid */ + +/* Sizes of siginfo_t. */ +#define SIZE64_SIGINFO_T 80 +#define SIZE32_SIGINFO_T 64 + static struct gdbarch_data *fbsd_gdbarch_data_handle; struct fbsd_gdbarch_data @@ -113,6 +135,51 @@ fbsd_core_thread_name (struct gdbarch *gdbarch, struct thread_info *thr) return NULL; } +/* Implement the "core_xfer_siginfo" gdbarch method. */ + +static LONGEST +fbsd_core_xfer_siginfo (struct gdbarch *gdbarch, gdb_byte *readbuf, + ULONGEST offset, ULONGEST len) +{ + size_t siginfo_size; + + if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) + siginfo_size = SIZE32_SIGINFO_T; + else + siginfo_size = SIZE64_SIGINFO_T; + if (offset > siginfo_size) + return -1; + + thread_section_name section_name (".note.freebsdcore.lwpinfo", inferior_ptid); + asection *section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); + if (section == NULL) + return -1; + + gdb_byte buf[4]; + if (!bfd_get_section_contents (core_bfd, section, buf, + LWPINFO_OFFSET + LWPINFO_PL_FLAGS, 4)) + return -1; + + int pl_flags = extract_signed_integer (buf, 4, gdbarch_byte_order (gdbarch)); + if (!(pl_flags & PL_FLAG_SI)) + return -1; + + if (offset + len > siginfo_size) + len = siginfo_size - offset; + + ULONGEST siginfo_offset; + if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word == 32) + siginfo_offset = LWPINFO_OFFSET + LWPINFO32_PL_SIGINFO; + else + siginfo_offset = LWPINFO_OFFSET + LWPINFO64_PL_SIGINFO; + + if (!bfd_get_section_contents (core_bfd, section, readbuf, + siginfo_offset + offset, len)) + return -1; + + return len; +} + static int find_signalled_thread (struct thread_info *info, void *data) { @@ -447,6 +514,7 @@ fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { set_gdbarch_core_pid_to_str (gdbarch, fbsd_core_pid_to_str); set_gdbarch_core_thread_name (gdbarch, fbsd_core_thread_name); + set_gdbarch_core_xfer_siginfo (gdbarch, fbsd_core_xfer_siginfo); set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes); set_gdbarch_print_auxv_entry (gdbarch, fbsd_print_auxv_entry); set_gdbarch_get_siginfo_type (gdbarch, fbsd_get_siginfo_type); |