chore: update Makefile and linker

Makefile

@@ -476,6 +476,84 @@ $(UBUILD)/timetest.elf: $(UBUILD)/timetest.o $(USERCOMMON) user/user.ld
 # `false && echo X || echo ...` line (shell.c's new `&&`/`||` conditional
 # chaining, kmain.c's new andOrDriverThread). USER_BASE picks up the slot
 # right after timetest.elf's (the last one reserved).
+$(UBUILD)/false.elf: $(UBUILD)/false.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x4E0000000 -o $@ $(UBUILD)/false.o $(USERCOMMON)
+
+# argecho is, like globcat/false above, never spawned by kmain.c directly --
+# loaded on demand when the real interactive shell processes a typed
+# `argecho $?` line (shell.c's new `$?` expansion, kmain.c's extended
+# andOrDriverThread). USER_BASE picks up the slot right after false.elf's
+# (the last one reserved).
+$(UBUILD)/argecho.elf: $(UBUILD)/argecho.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x4F0000000 -o $@ $(UBUILD)/argecho.o $(USERCOMMON)
+
+# rmtest is spawned directly by kmain.c at boot, fully synchronous like
+# timetest.elf/date.elf/nicetest.elf above -- no shell rendezvous, no
+# injected keystroke. USER_BASE is the slot right after argecho.elf's (the
+# last one reserved); nothing else references any address in or past this
+# slot.
+$(UBUILD)/rmtest.elf: $(UBUILD)/rmtest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x500000000 -o $@ $(UBUILD)/rmtest.o $(USERCOMMON)
+
+# permtest is spawned directly by kmain.c at boot, fully synchronous like
+# rmtest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after rmtest.elf's (the last one reserved); nothing
+# else references any address in or past this slot.
+$(UBUILD)/permtest.elf: $(UBUILD)/permtest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x510000000 -o $@ $(UBUILD)/permtest.o $(USERCOMMON)
+
+# identtest is spawned directly by kmain.c at boot, fully synchronous like
+# permtest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after permtest.elf's (the last one reserved); nothing
+# else references any address in or past this slot.
+$(UBUILD)/identtest.elf: $(UBUILD)/identtest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x520000000 -o $@ $(UBUILD)/identtest.o $(USERCOMMON)
+
+# dirpermtest is spawned directly by kmain.c at boot, fully synchronous like
+# identtest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after identtest.elf's (the last one reserved); nothing
+# else references any address in or past this slot.
+$(UBUILD)/dirpermtest.elf: $(UBUILD)/dirpermtest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x530000000 -o $@ $(UBUILD)/dirpermtest.o $(USERCOMMON)
+
+# grouptest is spawned directly by kmain.c at boot, fully synchronous like
+# dirpermtest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after dirpermtest.elf's (the last one reserved); nothing
+# else references any address in or past this slot.
+$(UBUILD)/grouptest.elf: $(UBUILD)/grouptest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x540000000 -o $@ $(UBUILD)/grouptest.o $(USERCOMMON)
+
+# pidfdtest is spawned directly by kmain.c at boot, fully synchronous like
+# grouptest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after grouptest.elf's (the last one reserved, verified by
+# scanning every USER_BASE in this Makefile, not just assumed to be "one past
+# the highest" -- see kmain.c's own nicetest/date address-space inconsistency,
+# left as a warning for exactly this kind of addition); nothing else
+# references any address in or past this slot.
+$(UBUILD)/pidfdtest.elf: $(UBUILD)/pidfdtest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x550000000 -o $@ $(UBUILD)/pidfdtest.o $(USERCOMMON)
+
+# mmaptest is spawned directly by kmain.c at boot, fully synchronous like
+# pidfdtest.elf above -- no shell rendezvous, no injected keystroke. USER_BASE
+# is the slot right after pidfdtest.elf's (the last one reserved, verified by
+# scanning every USER_BASE in this Makefile); nothing else references any
+# address in or past this slot.
+$(UBUILD)/mmaptest.elf: $(UBUILD)/mmaptest.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x560000000 -o $@ $(UBUILD)/mmaptest.o $(USERCOMMON)
+
+# mmapprotvictim is only ever spawned at RUNTIME by mmaptest.elf itself
+# (userSpawn), never directly by kmain.c -- same relationship killvictim.elf
+# already has to killtest.elf. USER_BASE is the slot right after
+# mmaptest.elf's own.
+$(UBUILD)/mmapprotvictim.elf: $(UBUILD)/mmapprotvictim.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x570000000 -o $@ $(UBUILD)/mmapprotvictim.o $(USERCOMMON)
+
+# mmapexecvictim is only ever spawned at RUNTIME by mmaptest.elf itself
+# (userSpawn), exactly like mmapprotvictim.elf above -- never directly by
+# kmain.c. USER_BASE is the slot right after mmapprotvictim.elf's own.
+$(UBUILD)/mmapexecvictim.elf: $(UBUILD)/mmapexecvictim.o $(USERCOMMON) user/user.ld
+	$(LD) $(ULDFLAGS) --defsym USER_BASE=0x580000000 -o $@ $(UBUILD)/mmapexecvictim.o $(USERCOMMON)
+
 $(MKTAR): tools/mktar.c | $(BUILD)
 	gcc -O2 -Wall -Wextra -o $@ $<
 
@@ -486,6 +564,85 @@ $(INITRD): $(MKTAR) $(USERPROGRAMS) $(FSFILES)
 	  --file bin/counter $(UBUILD)/counter.elf \
 	  --file bin/sbrktest $(UBUILD)/sbrktest.elf \
 	  --file bin/fileread $(UBUILD)/fileread.elf \
+	  --file bin/pipetest $(UBUILD)/pipetest.elf \
+	  --file bin/disktest $(UBUILD)/disktest.elf \
+	  --file bin/fstest $(UBUILD)/fstest.elf \
+	  --file bin/linktest $(UBUILD)/linktest.elf \
+	  --file bin/spawntarget $(UBUILD)/spawntarget.elf \
+	  --file bin/exectarget $(UBUILD)/exectarget.elf \
+	  --file bin/proctest $(UBUILD)/proctest.elf \
+	  --file bin/argtest $(UBUILD)/argtest.elf \
+	  --file bin/fifomaster $(UBUILD)/fifomaster.elf \
+	  --file bin/fifowriter $(UBUILD)/fifowriter.elf \
+	  --file bin/fiforeader $(UBUILD)/fiforeader.elf \
+	  --file bin/killtest $(UBUILD)/killtest.elf \
+	  --file bin/killvictim $(UBUILD)/killvictim.elf \
+	  --file bin/namedreader $(UBUILD)/namedreader.elf \
+	  --file bin/namedwriter $(UBUILD)/namedwriter.elf \
+	  --file bin/consolereader1 $(UBUILD)/consolereader1.elf \
+	  --file bin/consolereader2 $(UBUILD)/consolereader2.elf \
+	  --file bin/sigtest $(UBUILD)/sigtest.elf \
+	  --file bin/sigtarget $(UBUILD)/sigtarget.elf \
+	  --file bin/sigdefault $(UBUILD)/sigdefault.elf \
+	  --file bin/jobtest $(UBUILD)/jobtest.elf \
+	  --file bin/jobtarget $(UBUILD)/jobtarget.elf \
+	  --file bin/nesttest $(UBUILD)/nesttest.elf \
+	  --file bin/nesttarget $(UBUILD)/nesttarget.elf \
+	  --file bin/eintrtest $(UBUILD)/eintrtest.elf \
+	  --file bin/eintrtarget $(UBUILD)/eintrtarget.elf \
+	  --file bin/restarttest $(UBUILD)/restarttest.elf \
+	  --file bin/restarttarget $(UBUILD)/restarttarget.elf \
+	  --file bin/masktest $(UBUILD)/masktest.elf \
+	  --file bin/masktarget $(UBUILD)/masktarget.elf \
+	  --file bin/sigchldtest $(UBUILD)/sigchldtest.elf \
+	  --file bin/sigchldchild $(UBUILD)/sigchldchild.elf \
+	  --file bin/waitanytest $(UBUILD)/waitanytest.elf \
+	  --file bin/waitanyfast $(UBUILD)/waitanyfast.elf \
+	  --file bin/waitanyslow $(UBUILD)/waitanyslow.elf \
+	  --file bin/stopchldtest $(UBUILD)/stopchldtest.elf \
+	  --file bin/stopchldtarget $(UBUILD)/stopchldtarget.elf \
+	  --file bin/nodefertest $(UBUILD)/nodefertest.elf \
+	  --file bin/alarmtest $(UBUILD)/alarmtest.elf \
+	  --file bin/alarmdefault $(UBUILD)/alarmdefault.elf \
+	  --file bin/siginfotest $(UBUILD)/siginfotest.elf \
+	  --file bin/siginfotarget $(UBUILD)/siginfotarget.elf \
+	  --file bin/pgroupfg $(UBUILD)/pgroupfg.elf \
+	  --file bin/pgroupbg $(UBUILD)/pgroupbg.elf \
+	  --file bin/jobctlfg $(UBUILD)/jobctlfg.elf \
+	  --file bin/jobctlbg $(UBUILD)/jobctlbg.elf \
+	  --file bin/polltest $(UBUILD)/polltest.elf \
+	  --file bin/pollwriter $(UBUILD)/pollwriter.elf \
+	  --file bin/pipesrc $(UBUILD)/pipesrc.elf \
+	  --file bin/pipesink $(UBUILD)/pipesink.elf \
+	  --file bin/redirwriter $(UBUILD)/redirwriter.elf \
+	  --file bin/redirreader $(UBUILD)/redirreader.elf \
+	  --file bin/stderrwriter $(UBUILD)/stderrwriter.elf \
+	  --file bin/stderrreader $(UBUILD)/stderrreader.elf \
+	  --file bin/selfstoptest $(UBUILD)/selfstoptest.elf \
+	  --file bin/selfstoptarget $(UBUILD)/selfstoptarget.elf \
+	  --file bin/herestest $(UBUILD)/herestest.elf \
+	  --file bin/hcat $(UBUILD)/hcat.elf \
+	  --file bin/hsink $(UBUILD)/hsink.elf \
+	  --file bin/pipecat $(UBUILD)/pipecat.elf \
+	  --file bin/cwdtest $(UBUILD)/cwdtest.elf \
+	  --file bin/cwdtarget $(UBUILD)/cwdtarget.elf \
+	  --file bin/envprint $(UBUILD)/envprint.elf \
+	  --file bin/nicetest $(UBUILD)/nicetest.elf \
+	  --file bin/nicetarget $(UBUILD)/nicetarget.elf \
+	  --file bin/date $(UBUILD)/date.elf \
+	  --file bin/globcat $(UBUILD)/globcat.elf \
+	  --file bin/timetest $(UBUILD)/timetest.elf \
+	  --file bin/false $(UBUILD)/false.elf \
+	  --file bin/argecho $(UBUILD)/argecho.elf \
+	  --file bin/rmtest $(UBUILD)/rmtest.elf \
+	  --file bin/permtest $(UBUILD)/permtest.elf \
+	  --file bin/identtest $(UBUILD)/identtest.elf \
+	  --file bin/dirpermtest $(UBUILD)/dirpermtest.elf \
+	  --file bin/grouptest $(UBUILD)/grouptest.elf \
+	  --file bin/pidfdtest $(UBUILD)/pidfdtest.elf \
+	  --file bin/mmaptest $(UBUILD)/mmaptest.elf \
+	  --file bin/mmapprotvictim $(UBUILD)/mmapprotvictim.elf \
+	  --file bin/mmapexecvictim $(UBUILD)/mmapexecvictim.elf \
 	  --file etc/motd.txt fsroot/etc/motd.txt \
 	  --file etc/readme.txt fsroot/etc/readme.txt \
 	  --file home/notes.txt fsroot/home/notes.txt
@@ -495,14 +652,27 @@ $(ISO): $(KERNEL) $(INITRD) iso/boot/grub/grub.cfg
 	@cp $(INITRD) iso/boot/initrd.img
 	grub-mkrescue -o $(ISO) iso 2>/dev/null
 
-run: $(ISO)
+# Scratch disk backing /dev/disk0 (ata.c / vfs.c blockDev*). Zeroed, not
-	qemu-system-x86_64 -cdrom $(ISO) -serial stdio -m 128M
+# committed: a fresh 8 MiB raw image is exactly as good as any other for a
+# driver that owns the whole device and formats nothing on it.
+$(DISK): | $(BUILD)
+	dd if=/dev/zero of=$@ bs=1M count=8 status=none
 
-runserial: $(ISO)
+run: $(ISO) $(DISK)
-	qemu-system-x86_64 -cdrom $(ISO) -serial stdio -display none -m 128M -no-reboot
+	qemu-system-x86_64 -cdrom $(ISO) $(DISKFLAGS) -serial stdio -m 128M
 
-test: $(ISO)
+runserial: $(ISO) $(DISK)
+	qemu-system-x86_64 -cdrom $(ISO) $(DISKFLAGS) -serial stdio -display none -m 128M -no-reboot
+
+test: $(ISO) $(DISK)
 	sh tools/ci-test.sh
 
 clean:
 	rm -rf $(BUILD) $(ISO) iso/boot/frostbyte.elf iso/boot/initrd.img
+
+# Auto-generated header dependencies (-MMD -MP above): without these, editing
+# a widely-included header (e.g. sched.h) would not force a rebuild of every
+# .c file that includes it, silently linking objects compiled against
+# different struct layouts of the same type -- exactly the kind of ABI
+# mismatch that corrupts memory at runtime instead of failing to build.
+-include $(wildcard $(BUILD)/*.d) $(wildcard $(UBUILD)/*.d)

linker.ld

@@ -19,6 +19,7 @@ SECTIONS
     {
         *(.multiboot)
         *(.boot.text)
+        *(.boot.data)
         . = ALIGN(4096);
         *(.boot.pagetables)
     } :boot
@@ -33,6 +34,10 @@ SECTIONS
     .rodata ALIGN(4096) : AT(ADDR(.rodata) - KERNEL_VMA)
     {
         *(.rodata .rodata.*)
+        . = ALIGN(8);
+        ktestArrayStart = .;
+        KEEP(*(.ktests .ktests.*))
+        ktestArrayEnd = .;
     } :rodata
 
     .data ALIGN(4096) : AT(ADDR(.data) - KERNEL_VMA)