compiler flag, which is used to set the name of the patch table. The compiler
now understands C preprocessor line directives. Extend the standard library
somewhat.
Convert each ack.out symbol to ELF, preserving its name and value, and
some but not all other symbol info. The ELF symbol table comes with
ELF section headers. If the input file has no symbols (ack -Rled-s),
then the output file has no ELF section headers.
Append the symbol table and section headers to the ELF file. Linux
ignores this appended info when it execs the file. The info might
pollute the last page of the ELF segment, but Linux clears this
pollution. Tools like nm and gdb can read the ELF symbol table.
I include code to translate debugger symbols to an ELF .stab section.
I did not test this code, because I did not find a platform that can
put S_STB symbols in the ack.out file.
Put end of sentence at end of line. This is roff(7) syntax so the
formatter can make spacing between sentences.
Use the macro .PP to break paragraphs. Use bold for the command name
in SYNOPSIS, to match other ack manuals.
This provides and, ior, xor, com, zer, set, cms when defined($1) and
ior, set when !defined($1). I don't provide the other operations
!defined($1) because our Modula-2 compiler hasn't used them.
I wrote a Modula-2 example in
https://gist.github.com/kernigh/add79662bb3c63ffb7c46d01dc8ae788
Put a dummy comment in mach/powerpc/libem/build.lua so git checkout
will touch that file. Without the touch, the build system doesn't see
the new *.s files.
We only implement 'los 4', 'sts 4', 'cmi 4', 'cmu 4', not for sizes
other than 4. Add clause $1==4.
We only implement inn when defined($1).
The rule for aar needs 'kills ALL' because it kills many registers,
like other rules that call libem.
This allows 'move {CONST, $1}, R3' with a small enough $1 to emit one
instruction (addi) instead of two instructions (addis, ori). The
CONST token confusingly isn't in the CONST_ALL set.
The spec says, "ASS w: Adjust the stack pointer by w-byte integer".
The w argument "can either be given as argument or on top of the
stack." Therefore, 'ass 4' would pop the 4-byte integer from the
stack, but 'ass' would pop the size w from the stack, then pop the
w-byte integer.
PowerPC ncg wrongly implemented 'ass' as if it was 'ass 4'. Fix it to
accept only 'ass 4'.
These instructions would load or store the EM heap pointer. They
don't work. Programs must use brk() or sbrk() in libsys.
The last file to use 'lor 2' and 'str 2' was lang/pc/libpc/sav.e in
the Pascal library. Commit c084f9f deleted the file, so we no longer
need rules 'lor 2' or 'str 2' to build the ACK.
Without this, qemu-system-ppc spins the host cpu until I close its
window. I assume the default G3 emulation. The emulator yields the
host cpu if I set certain flags in hid0 then msr. The hid0 flag can
be any of DOZE, NAP, SLEEP, so I just set all 3. I encode mfmsr and
mtmsr with .data4, because our assembler doesn't know instructions for
supervisor mode.
Also move some common symbols from .rom to .bss. Our assembler puts
common symbols in any section.
Also clean up the file. Delete a comment about linuxppc that is wrong
here. Delete redundant .extern because .define is the same.
PowerPC has a few hundred special-purpose registers. The assembler
had only accepted the names "xer", "lr", "ctr". Most programs use
only those three SPRs. If I add more names, they would almost never
get used, and they might conflict with labels.
I want to use "mfspr r3, 0x3f0" and "mtspr 0x3f0, r3" in
plat/qemu/boot.s to access register hid0 from supervisor mode.
