diff options
Diffstat (limited to 'tcg/tcg.h')
| -rw-r--r-- | tcg/tcg.h | 45 |
1 files changed, 45 insertions, 0 deletions
@@ -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 |