diff options
Diffstat (limited to 'tcg/tci/README')
| -rw-r--r-- | tcg/tci/README | 20 |
1 files changed, 5 insertions, 15 deletions
diff --git a/tcg/tci/README b/tcg/tci/README index 9bb7d7a..f72a40a 100644 --- a/tcg/tci/README +++ b/tcg/tci/README @@ -23,10 +23,12 @@ This is what TCI (Tiny Code Interpreter) does. Like each TCG host frontend, TCI implements the code generator in tcg-target.c.inc, tcg-target.h. Both files are in directory tcg/tci. -The additional file tcg/tci.c adds the interpreter. +The additional file tcg/tci.c adds the interpreter and disassembler. -The bytecode consists of opcodes (same numeric values as those used by -TCG), command length and arguments of variable size and number. +The bytecode consists of opcodes (with only a few exceptions, with +the same same numeric values and semantics as used by TCG), and up +to six arguments packed into a 32-bit integer. See comments in tci.c +for details on the encoding. 3) Usage @@ -39,11 +41,6 @@ suggest using this option. Setting it automatically would need additional code in configure which must be fixed when new native TCG implementations are added. -System emulation should work on any 32 or 64 bit host. -User mode emulation might work. Maybe a new linker script (*.ld) -is needed. Byte order might be wrong (on big endian hosts) -and need fixes in configure. - For hosts with native TCG, the interpreter TCI can be enabled by configure --enable-tcg-interpreter @@ -118,13 +115,6 @@ u1 = linux-user-test works in the interpreter. These opcodes raise a runtime exception, so it is possible to see where code must be added. -* The pseudo code is not optimized and still ugly. For hosts with special - alignment requirements, it needs some fixes (maybe aligned bytecode - would also improve speed for hosts which support byte alignment). - -* A better disassembler for the pseudo code would be nice (a very primitive - disassembler is included in tcg-target.c.inc). - * It might be useful to have a runtime option which selects the native TCG or TCI, so QEMU would have to include two TCGs. Today, selecting TCI is a configure option, so you need two compilations of QEMU. |