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gdb: Don't assume r_ldsomap when r_version > 1 on Linux

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The r_ldsomap field is specific to Solaris (part of librtld_db), and
should never be accessed for Linux.  glibc is planning to add a field
to support multiple namespaces.  But there will be no r_ldsomap when
r_version is bumped to 2.  Add linux_[ilp32|lp64]_fetch_link_map_offsets
to set r_ldsomap_offset to -1 and use them for Linux targets.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28236
This commit is contained in:
H.J. Lu
2021-08-16 16:17:25 -07:00
parent 4eb629d50d
commit c0154a4a21
27 changed files with 97 additions and 32 deletions
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4
gdb/amd64-linux-tdep.c
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@@ -2042,7 +2042,7 @@ amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* GNU/Linux uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
(gdbarch, linux_lp64_fetch_link_map_offsets);
/* Register DTrace handlers. */
set_gdbarch_dtrace_parse_probe_argument (gdbarch, amd64_dtrace_parse_probe_argument);
@@ -2256,7 +2256,7 @@ amd64_x32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
/* GNU/Linux uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
(gdbarch, linux_ilp32_fetch_link_map_offsets);
}
void _initialize_amd64_linux_tdep ();