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* gdbint.texinfo (Target Conditionals): Extend the

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gdbarch_breakpoint_from_pc description.
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Jan Kratochvil
2008-11-26 05:26:40 +00:00
parent fc9b693caa
commit a655d42411
2 changed files with 14 additions and 2 deletions
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gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2008-11-25 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdbint.texinfo (Target Conditionals): Extend the
gdbarch_breakpoint_from_pc description.
2008-11-22 Vladimir Prus <vladimir@codesourcery.com> 2008-11-22 Vladimir Prus <vladimir@codesourcery.com>
* gdb.texinfo (M68K Features): Fix typo. * gdb.texinfo (M68K Features): Fix typo.

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gdb/doc/gdbint.texinfo
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@ -3430,16 +3430,23 @@ favor of @code{gdbarch_breakpoint_from_pc}.
@findex gdbarch_breakpoint_from_pc @findex gdbarch_breakpoint_from_pc
@anchor{gdbarch_breakpoint_from_pc} Use the program counter to determine the @anchor{gdbarch_breakpoint_from_pc} Use the program counter to determine the
contents and size of a breakpoint instruction. It returns a pointer to contents and size of a breakpoint instruction. It returns a pointer to
a string of bytes that encode a breakpoint instruction, stores the a static string of bytes that encode a breakpoint instruction, stores the
length of the string to @code{*@var{lenptr}}, and adjusts the program length of the string to @code{*@var{lenptr}}, and adjusts the program
counter (if necessary) to point to the actual memory location where the counter (if necessary) to point to the actual memory location where the
breakpoint should be inserted. breakpoint should be inserted. May return @code{NULL} to indicate that
software breakpoints are not supported.
Although it is common to use a trap instruction for a breakpoint, it's Although it is common to use a trap instruction for a breakpoint, it's
not required; for instance, the bit pattern could be an invalid not required; for instance, the bit pattern could be an invalid
instruction. The breakpoint must be no longer than the shortest instruction. The breakpoint must be no longer than the shortest
instruction of the architecture. instruction of the architecture.
Provided breakpoint bytes can be also used by @code{bp_loc_is_permanent} to
detect permanent breakpoints. @code{gdbarch_breakpoint_from_pc} should return
an unchanged memory copy if it was called for a location with permanent
breakpoint as some architectures use breakpoint instructions containing
arbitrary parameter value.
Replaces all the other @var{BREAKPOINT} macros. Replaces all the other @var{BREAKPOINT} macros.
@item int gdbarch_memory_insert_breakpoint (@var{gdbarch}, @var{bp_tgt}) @item int gdbarch_memory_insert_breakpoint (@var{gdbarch}, @var{bp_tgt})