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| author | Mark Wielaard <mjw@redhat.com> | 2014-06-14 17:15:37 +0200 |
|---|---|---|
| committer | Mark Wielaard <mjw@redhat.com> | 2014-06-22 13:47:48 +0200 |
| commit | c1c1c06e30f0b3b4ae66fcfec6318a93b8f31569 (patch) | |
| tree | e5b811236c230f2ea82749f0ad9c2c4ac1bcf396 /libebl/libebl.h | |
| parent | ba9e5156207e3c2bb85adc747376e774af3c0df6 (diff) | |
| download | android_external_elfutils-c1c1c06e30f0b3b4ae66fcfec6318a93b8f31569.tar.gz android_external_elfutils-c1c1c06e30f0b3b4ae66fcfec6318a93b8f31569.tar.bz2 android_external_elfutils-c1c1c06e30f0b3b4ae66fcfec6318a93b8f31569.zip | |
libebl: Add ebl_func_addr_mask plus ARM backend implementation.
The ARM EABI says that the zero bit of function symbol st_value indicates
whether the symbol points to a THUMB or ARM function. Also the return
value address in an unwind will contain the same extra bit to indicate
whether to return to a regular ARM or THUMB function. Add a new ebl
function to mask off such bits and turn a function value into a function
address so that we get the actual value that a function symbol or return
address points to. It isn't easily possible to reuse the existing
ebl_resolve_sym_value for this purpose, so we end up with another hook
that can be used from dwfl_module_getsym, handle_cfi and elflint.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Diffstat (limited to 'libebl/libebl.h')
| -rw-r--r-- | libebl/libebl.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libebl/libebl.h b/libebl/libebl.h index d05751fa..bb993bf0 100644 --- a/libebl/libebl.h +++ b/libebl/libebl.h @@ -1,5 +1,5 @@ /* Interface for libebl. - Copyright (C) 2000-2010, 2013 Red Hat, Inc. + Copyright (C) 2000-2010, 2013, 2014 Red Hat, Inc. This file is part of elfutils. This file is free software; you can redistribute it and/or modify @@ -409,6 +409,17 @@ extern bool ebl_set_initial_registers_tid (Ebl *ebl, extern size_t ebl_frame_nregs (Ebl *ebl) __nonnull_attribute__ (1); +/* Mask to use for function symbol or unwind return addresses in case + the architecture adds some extra non-address bits to it. This is + different from ebl_resolve_sym_value which only works for actual + symbol addresses (in non-ET_REL files) that might resolve to an + address in a different section. ebl_func_addr_mask is called to + turn a given function value into the a real address or offset (the + original value might not be a real address). This works for all + cases where an actual function address (or offset in ET_REL symbol + tables) is needed. */ +extern GElf_Addr ebl_func_addr_mask (Ebl *ebl); + /* Convert *REGNO as is in DWARF to a lower range suitable for Dwarf_Frame->REGS indexing. */ extern bool ebl_dwarf_to_regno (Ebl *ebl, unsigned *regno) |