diff options
| author | Mark Wielaard <[email protected]> | 2014-06-14 17:15:37 +0200 |
|---|---|---|
| committer | Mark Wielaard <[email protected]> | 2014-06-22 13:47:48 +0200 |
| commit | c1c1c06e30f0b3b4ae66fcfec6318a93b8f31569 (patch) | |
| tree | e5b811236c230f2ea82749f0ad9c2c4ac1bcf396 /backends | |
| parent | ba9e5156207e3c2bb85adc747376e774af3c0df6 (diff) | |
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 <[email protected]>
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/ChangeLog | 4 | ||||
| -rw-r--r-- | backends/arm_init.c | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/backends/ChangeLog b/backends/ChangeLog index 7eda035c..c846a958 100644 --- a/backends/ChangeLog +++ b/backends/ChangeLog @@ -1,3 +1,7 @@ +2014-06-17 Mark Wielaard <[email protected]> + + * arm_init.c (arm_init): Set func_addr_mask. + 2014-06-20 Petr Machata <[email protected]> * alpha_retval.c (alpha_return_value_location): Call diff --git a/backends/arm_init.c b/backends/arm_init.c index 92e6cd51..3283c978 100644 --- a/backends/arm_init.c +++ b/backends/arm_init.c @@ -69,5 +69,8 @@ arm_init (elf, machine, eh, ehlen) eh->frame_nregs = 16; HOOK (eh, set_initial_registers_tid); + /* Bit zero encodes whether an function address is THUMB or ARM. */ + eh->func_addr_mask = ~(GElf_Addr)1; + return MODVERSION; } |