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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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6
gdb/mips-linux-tdep.c
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@ -1542,7 +1542,7 @@ mips_linux_init_abi (struct gdbarch_info info,
set_gdbarch_get_longjmp_target (gdbarch,
mips_linux_get_longjmp_target);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
(gdbarch, linux_ilp32_fetch_link_map_offsets);
tramp_frame_prepend_unwinder (gdbarch, &micromips_linux_o32_sigframe);
tramp_frame_prepend_unwinder (gdbarch,
&micromips_linux_o32_rt_sigframe);
@ -1554,7 +1554,7 @@ mips_linux_init_abi (struct gdbarch_info info,
set_gdbarch_get_longjmp_target (gdbarch,
mips_linux_get_longjmp_target);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
(gdbarch, linux_ilp32_fetch_link_map_offsets);
set_gdbarch_long_double_bit (gdbarch, 128);
/* These floatformats should probably be renamed. MIPS uses
the same 128-bit IEEE floating point format that IA-64 uses,
@ -1570,7 +1570,7 @@ mips_linux_init_abi (struct gdbarch_info info,
set_gdbarch_get_longjmp_target (gdbarch,
mips64_linux_get_longjmp_target);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
(gdbarch, linux_lp64_fetch_link_map_offsets);
set_gdbarch_long_double_bit (gdbarch, 128);
/* These floatformats should probably be renamed. MIPS uses
the same 128-bit IEEE floating point format that IA-64 uses,