Fix PowerPC ncg so setjmp() returns the correct value. I got unlucky
when ncg picked r3 for "uses REG"; this destroyed the return value in
r3 and caused the new test to fail.
The new test rck_e.e segfaults on PowerPC unless I make some changes.
The inline code for _rck_ was wrong because it didn't allow the trap
handler to return. _sig_ forgot to push the old trap handler.
Move plat/linuxppc/libsys/trap.s to mach/powerpc/libem/trp.s and
rewrite it with simplified/extended mnemonics. Remove .trap alias for
.trp procedure. Add a missing `mtspr lr, r0` so we can return from
the trap handler. Call write() and _exit() so trp.s works with both
linuxppc and osxppc. Before, Mac OS X was wrongly using the trap.s
for Linux.
In powerpc/libem, simplify .aar4; teach .csa and .csb to raise the
trap if the default target is zero.
C programs don't need these changes. You may relink your C programs
with the changed .csa and .csb, but C code doesn't raise the trap.
Modula-2 code can raise traps, so you may want to relink your Modula-2
programs with the changed libem, but you might keep your old .o files
from Modula-2. You may need to recompile your Pascal programs (delete
old .o files from Pascal) because the Pascal compiler might use _rck_.
This would become necessary if something failed on a platform with
16-bit int (EM_WSIZE == 2).
Remove unreachable `ret 0`. If reached, it wouldn't work to return
from _m_a_i_n.
Don't output '\0' in "@@FINISHED\0".
Cast code to unsigned int. This helps platforms with 16-bit int, by
doing only the low 16 bits of the bitwise-and. It also removes the
"(warning) conversion of long to pointer loses accuracy".
Allow asp 4, exg 4 to shuffle tokens without coercing them into
registers; but comment why dup 4, dup 8 coerce tokens into registers.
Allow dup, dus, exg with larger sizes; and add tests dup_e.e and
exg_e.e to check that dup 20, dus, exg 20 work as well in powerpc as
in i80 and i86.
Then powerpc failed to compile loc 2 loc 4 cuu in dup_e.e. Revise the
integer conversions, so powerpc can compile and pass the test.
EM instructions _rol_ and _ror_ do rotate an integer left or right.
Our compilers and optimizers never emit _rol_ nor _ror_, but I might
want to use them in the future.
Add _rol_ and _ror_ to powerpc. Fix `rol 4` and `ror 4` in both i80
and i86, where the rules for `rol 4` and `ror 4` seem to have never
been tested until now.
My computer is too slow, so qemuppc tests randomly timed out. With
this commit, my machine passes the qemuppc tests (if I also edit the
top build.lua to enable qemuppc).
A `set -e` in testdriver.sh caused it to exit early and hide the
output of a @@TIMEDOUT test, so I never saw the @@TIMEDOUT marker.
Then build.lua added a @@FAIL marker.
possible values. Add the PowerPC ncg and mcg backend support to let the test
actually run, including modifying a bunch of PowrePC libem functions so that
they can be called from both ncg and mcg.
