No Control-flow Enforcement Technology support #6
Description
Much like @omar-polo at taisei-project/taisei#372 , I'm trying Taisei 1.4 in OpenBSD. Much like Omar, the game crashes at the beginning of the first level, but for a different reason: OpenBSD has CET enabled by default in -current and my machine does support it (11th gen Intel).
At the port level, I worked it around by removing CET enforcement, but it would be nice if this library could work without it. Boost has some workarounds for it which I tried to apply at least for my arch, make_x86_64_sysv_elf_gas.S, which is adding the _CET_ENDBR macro at the beginning of each function. That isn't enough to solve it for me, as then I run into another issue:
Program terminated with signal SIGILL, Illegal instruction.
#0 koishi_fiber_swap (from=<optimized out>, to=<optimized out>) at ../taisei-1.4/subprojects/koishi/src/fcontext/fcontext.c:43
43 from->fctx = tf.fctx;
--Type <RET> for more, q to quit, c to continue without paging--
[Current thread is 1 (process 270966)]
(gdb) bt
#0 koishi_fiber_swap (from=<optimized out>, to=<optimized out>) at ../taisei-1.4/subprojects/koishi/src/fcontext/fcontext.c:43
#1 koishi_swap_coroutine (from=<optimized out>, to=<optimized out>, state=3) at ../taisei-1.4/subprojects/koishi/src/fcontext/../fiber.h:46
#2 koishi_resume (co=<optimized out>, arg=<optimized out>) at ../taisei-1.4/subprojects/koishi/src/fcontext/../fiber.h:90
#3 cotask_resume_internal (task=0x23f89a860e0, arg=<optimized out>) at ../taisei-1.4/src/coroutine/cotask.c:237
#4 _cosched_new_task (sched=<optimized out>, func=<optimized out>, arg=<optimized out>, arg_size=<optimized out>, is_subtask=<optimized out>, debug=...)
at ../taisei-1.4/src/coroutine/cosched.c:39
#5 0x0000023d66f98876 in stage1_bg_init_fullstage () at ../taisei-1.4/src/stages/stage1/background_anim.c:72
#6 stage1_start () at ../taisei-1.4/src/stages/stage1/stage1.c:71
#7 0x0000023d66ed8a2a in COTASK_stage_comain (_cotask_args=<optimized out>) at ../taisei-1.4/src/stage.c:1018
#8 0x0000023d66ed60cc in COTASKTHUNK_stage_comain (arg=<optimized out>, arg_size=<optimized out>) at ../taisei-1.4/src/stage.c:1014
#9 0x0000023d66ef6a1b in cotask_entry (varg=0x723cefc249b0) at ../taisei-1.4/src/coroutine/cotask.c:371
#10 0x0000023d67048207 in koishi_entry (co=0x23fb5d59160) at ../taisei-1.4/subprojects/koishi/src/fcontext/../fiber.h:68
#11 0x0000023d670481ea in co_entry (tf=...) at ../taisei-1.4/subprojects/koishi/src/fcontext/fcontext.c:50
#12 0x0000023d66ea0dd7 in make_fcontext () at ../taisei-1.4/subprojects/koishi/src/fcontext/asm/make_x86_64_sysv_elf_gas.S:78
Backtrace stopped: Cannot access memory at address 0x23ffc717000
I have the core file around if it helps, and I'll gladly test patches.