library. This option overrides linker backend default. It can be used
to workaround incorrect relocations against protected data symbols
generated by compiler. Updates on protected data symbols by another
-module aren't visibile to the resulting shared library. Supported for
+module aren't visible to the resulting shared library. Supported for
i386 and x86-64.
+@item call-nop=prefix-addr
+@itemx call-nop=prefix-nop
+@itemx call-nop=suffix-nop
+@itemx call-nop=prefix-@var{byte}
+@itemx call-nop=suffix-@var{byte}
+Specify the 1-byte @code{NOP} padding when transforming indirect call
+to a locally defined function, foo, via its GOT slot.
+@option{call-nop=prefix-addr} generates @code{0x67 call foo}.
+@option{call-nop=prefix-nop} generates @code{0x90 call foo}.
+@option{call-nop=suffix-nop} generates @code{call foo 0x90}.
+@option{call-nop=prefix-@var{byte}} generates @code{@var{byte} call foo}.
+@option{call-nop=suffix-@var{byte}} generates @code{call foo @var{byte}}.
+Supported for i386 and x86_64.
+
@end table
Other keywords are ignored for Solaris compatibility.
@code{LD_RUN_PATH} will be used if it is defined.
The @option{-rpath} option may also be used on SunOS. By default, on
-SunOS, the linker will form a runtime search patch out of all the
+SunOS, the linker will form a runtime search path out of all the
@option{-L} options it is given. If a @option{-rpath} option is used, the
runtime search path will be formed exclusively using the @option{-rpath}
options, ignoring the @option{-L} options. This can be useful when using
instead of @samp{.debug}. @option{--compress-debug-sections=zlib}
and @option{--compress-debug-sections=zlib-gabi}
compress DWARF debug sections with SHF_COMPRESSED from the ELF ABI.
+The default behaviour varies depending upon the target involved and
+the configure options used to build the toolchain. The default can be
+determined by examing the output from the linker's @option{--help} option.
@kindex --reduce-memory-overheads
@item --reduce-memory-overheads
@end smallexample
or
@smallexample
-(ALIGN(@var{maxpagesize}) + (. & (@var{maxpagesize} - @var{commonpagesize})))
+(ALIGN(@var{maxpagesize})
+ + ((. + @var{commonpagesize} - 1) & (@var{maxpagesize} - @var{commonpagesize})))
@end smallexample
@noindent
depending on whether the latter uses fewer @var{commonpagesize} sized pages
Programmer Advice Notice'' available on the ARM documentation website at:
http://infocenter.arm.com/.
+@cindex STM32L4xx erratum workaround
+@kindex --fix-stm32l4xx-629360
+
+The @samp{--fix-stm32l4xx-629360} switch enables a link-time
+workaround for a bug in the bus matrix / memory controller for some of
+the STM32 Cortex-M4 based products (STM32L4xx). When accessing
+off-chip memory via the affected bus for bus reads of 9 words or more,
+the bus can generate corrupt data and/or abort. These are only
+core-initiated accesses (not DMA), and might affect any access:
+integer loads such as LDM, POP and floating-point loads such as VLDM,
+VPOP. Stores are not affected.
+
+The bug can be avoided by splitting memory accesses into the
+necessary chunks to keep bus reads below 8 words.
+
+The workaround is not enabled by default, this is equivalent to use
+@samp{--fix-stm32l4xx-629360=none}. If you know you are using buggy
+STM32L4xx hardware, you can enable the workaround by specifying the
+linker option @samp{--fix-stm32l4xx-629360}, or the equivalent
+@samp{--fix-stm32l4xx-629360=default}.
+
+If the workaround is enabled, instructions are scanned for
+potentially-troublesome sequences, and a veneer is created for each
+such sequence which may trigger the erratum. The veneer consists in a
+replacement sequence emulating the behaviour of the original one and a
+branch back to the subsequent instruction. The original instruction is
+then replaced with a branch to the veneer.
+
+The workaround does not always preserve the memory access order for
+the LDMDB instruction, when the instruction loads the PC.
+
+The workaround is not able to handle problematic instructions when
+they are in the middle of an IT block, since a branch is not allowed
+there. In that case, the linker reports a warning and no replacement
+occurs.
+
+The workaround is not able to replace problematic instructions with a
+PC-relative branch instruction if the @samp{.text} section is too
+large. In that case, when the branch that replaces the original code
+cannot be encoded, the linker reports a warning and no replacement
+occurs.
+
@cindex NO_ENUM_SIZE_WARNING
@kindex --no-enum-size-warning
The @option{--no-enum-size-warning} switch prevents the linker from
projects / binutils-gdb.git / blobdiff