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Fix resembles implementation from Marc Gauthier and Piet Denaly:
In the Xtensa architecture, assembly generates literals which must always
precede the code (the L32R instruction that loads them only uses negative
PC-relative offsets). For any *.text section, literals are placed in a
corresponding *.literal section. The linker script (vmlinux.lds) must
place these in the correct order. It must also combine them, when the
*.text section can be larger than L32R's 256 kB range.
For example, this doesn't work: *(.literal) *(.text) because L32R
instructions at the end of .text can't reach the literals.
The linker can solve this if they are combined in parentheses, like this:
*(.literal .text)
because it is now allowed mix literals in .text to bring them in range.
None of this is done by standard vmlinux.lds.h macros such as TEXT_TEXT
and INIT_TEXT. To avoid replicating the logic of that header file, we
instead post-process the generated linker script to convert *(xxx.text)
to *(xxx.literal xxx.text) for the following text sections:
.text .ref.text .*init.text .*exit.text .text.*
using a sed script. To do this we must override the default rule for
vmlinux.lds (see scripts/Makefile.build and the top-level Makefile)
to insert this extra step.
Signed-off-by: Marc Gauthier <marc@tensilica.com>
Signed-off-by: Pete Delaney <piet@tensilica.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
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| .. | ||
| align.S | ||
| asm-offsets.c | ||
| coprocessor.S | ||
| entry.S | ||
| head.S | ||
| init_task.c | ||
| io.c | ||
| irq.c | ||
| Makefile | ||
| module.c | ||
| pci-dma.c | ||
| pci.c | ||
| platform.c | ||
| process.c | ||
| ptrace.c | ||
| setup.c | ||
| signal.c | ||
| syscall.c | ||
| time.c | ||
| traps.c | ||
| vectors.S | ||
| vmlinux.lds.S | ||
| xtensa_ksyms.c | ||