PR breakpoints/21886: mem-break: Fix breakpoint insertion location
Fix a commit cd6c3b4ffc
("New gdbarch methods breakpoint_kind_from_pc
and sw_breakpoint_from_kind") regression and restore the use of
`->placed_address' rather than `->reqstd_address' as the location for a
memory breakpoint to be inserted at. Previously
`gdbarch_breakpoint_from_pc' was used that made that adjustment in
`default_memory_insert_breakpoint' from the preinitialized value,
however with the said commit that call is gone, so the passed
`->placed_address' has to be used for the initialization.
The regression manifests itself as the inability to debug any MIPS/Linux
compressed ISA dynamic executable as GDB corrupts the dynamic loader
with one of its implicit breakpoints, causing the program to crash, as
seen for example with the `mips-linux-gnu' target, o32 ABI, MIPS16 code,
and the gdb.base/advance.exp test case:
(gdb) continue
Continuing.
Program received signal SIGBUS, Bus error.
_dl_debug_initialize (ldbase=0, ns=0) at dl-debug.c:51
51 r = &_r_debug;
(gdb) FAIL: gdb.base/advance.exp: Can't run to main
gdb/
PR breakpoints/21886
* mem-break.c (default_memory_insert_breakpoint): Use
`->placed_address' rather than `->reqstd_address' for the
breakpoint location.
This commit is contained in:
parent
b28b8b5e31
commit
ba7b109b29
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@ -1,3 +1,10 @@
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2017-08-07 Maciej W. Rozycki <macro@imgtec.com>
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PR breakpoints/21886
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* mem-break.c (default_memory_insert_breakpoint): Use
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`->placed_address' rather than `->reqstd_address' for the
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breakpoint location.
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2017-08-07 Maciej W. Rozycki <macro@imgtec.com>
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* arch-utils.c (default_print_insn): Remove arch/mach/endian
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@ -37,7 +37,7 @@ int
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default_memory_insert_breakpoint (struct gdbarch *gdbarch,
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struct bp_target_info *bp_tgt)
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{
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CORE_ADDR addr = bp_tgt->reqstd_address;
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CORE_ADDR addr = bp_tgt->placed_address;
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const unsigned char *bp;
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gdb_byte *readbuf;
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int bplen;
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