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* gdbint.texinfo (FUNCTION_START_OFFSET): Document.

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Jim Blandy
2000-02-23 19:45:45 +00:00
parent 6a6987a96e
commit f7cb2b90b1
1 changed files with 14 additions and 0 deletions
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gdb/doc/gdbint.texinfo
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@ -1440,6 +1440,20 @@ function end symbol is 0. For such targets, you must define
@code{FUNCTION_EPILOGUE_SIZE} to expand into the standard size of a @code{FUNCTION_EPILOGUE_SIZE} to expand into the standard size of a
function's epilogue. function's epilogue.
@item FUNCTION_START_OFFSET
An integer, giving the offset in bytes from a function's address (as
used in the values of symbols, function pointers, etc.), and the
function's first genuine instruction.
This is zero on almost all machines: the function's address is usually
the address of its first instruction. However, on the VAX, for example,
each function starts with two bytes containing a bitmask indicating
which registers to save upon entry to the function. The VAX @code{call}
instructions check this value, and save the appropriate registers
automatically. Thus, since the offset from the function's address to
its first instruction is two bytes, @code{FUNCTION_START_OFFSET} would
be 2 on the VAX.
@item GCC_COMPILED_FLAG_SYMBOL @item GCC_COMPILED_FLAG_SYMBOL
@item GCC2_COMPILED_FLAG_SYMBOL @item GCC2_COMPILED_FLAG_SYMBOL
If defined, these are the names of the symbols that GDB will look for to If defined, these are the names of the symbols that GDB will look for to