Richard Henderson <[email protected]> writes: > Reviewed-by: Peter Maydell <[email protected]> > Signed-off-by: Richard Henderson <[email protected]>
Reviewed-by: Alex Bennée <[email protected]> > --- > tcg/tcg.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 45 insertions(+) > > diff --git a/tcg/tcg.h b/tcg/tcg.h > index a6a2d06..d38c92d 100644 > --- a/tcg/tcg.h > +++ b/tcg/tcg.h > @@ -724,6 +724,51 @@ TCGv_i32 tcg_const_local_i32(int32_t val); > TCGv_i64 tcg_const_local_i64(int64_t val); > > /** > + * tcg_ptr_byte_diff > + * @a, @b: addresses to be differenced > + * > + * There are many places within the TCG backends where we need a byte > + * difference between two pointers. While this can be accomplished > + * with local casting, it's easy to get wrong -- especially if one is > + * concerned with the signedness of the result. > + * > + * This version relies on GCC's void pointer arithmetic to get the > + * correct result. > + */ > + > +static inline ptrdiff_t tcg_ptr_byte_diff(void *a, void *b) > +{ > + return a - b; > +} > + > +/** > + * tcg_pcrel_diff > + * @s: the tcg context > + * @target: address of the target > + * > + * Produce a pc-relative difference, from the current code_ptr > + * to the destination address. > + */ > + > +static inline ptrdiff_t tcg_pcrel_diff(TCGContext *s, void *target) > +{ > + return tcg_ptr_byte_diff(target, s->code_ptr); > +} > + > +/** > + * tcg_current_code_size > + * @s: the tcg context > + * > + * Compute the current code size within the translation block. > + * This is used to fill in qemu's data structures for goto_tb. > + */ > + > +static inline size_t tcg_current_code_size(TCGContext *s) > +{ > + return tcg_ptr_byte_diff(s->code_ptr, s->code_buf); > +} > + > +/** > * tcg_qemu_tb_exec: > * @env: CPUArchState * for the CPU > * @tb_ptr: address of generated code for the TB to execute -- Alex Bennée
