40 commits

Author	SHA1	Message	Date
Toby Jaffey	6adbc53ad9	Remove impossible states	2025-12-14 01:34:59 +00:00
Toby Jaffey	179466eae4	Refactor	2025-12-14 00:18:06 +00:00
Toby Jaffey	173d5056a5	Completely remove UVM32_STACK_PROTECTION unless enabled (requires manually changing crt0.S), as this saves 16 bytes on every .bin	2025-12-14 00:09:32 +00:00
Toby Jaffey	2039de73f2	Rename getbuf to getslice	2025-12-13 23:15:06 +00:00
Toby Jaffey	b1b4cbf583	Fix bug where memory was being used instead of extram when reading cstring from extram	2025-12-13 18:46:28 +00:00
Toby Jaffey	903167231f	Fix internal memcpy/memset to have standard libc prototypes	2025-12-13 15:52:27 +00:00
Toby Jaffey	f8f7627eb8	Update README. ... Add license	2025-12-12 21:50:33 +00:00
Toby Jaffey	789cd74516	Disable stack canary by default	2025-12-12 21:01:40 +00:00
Toby Jaffey	8c97057809	Make extram uint8_t	2025-12-12 20:51:39 +00:00
Toby Jaffey	8158ac647c	Renaming and documentating header	2025-12-12 20:42:26 +00:00
Toby Jaffey	bba5fa654c	Fix off-by-one error which refused to read final byte of extram	2025-12-12 15:01:56 +00:00
Toby Jaffey	74267d94df	Handle syscall cstring argument when pointing to extram	2025-12-12 14:45:25 +00:00
Toby Jaffey	096efb3b2c	Remove unused var	2025-12-12 14:26:30 +00:00
Toby Jaffey	9836500503	Handle mapping a buffer to extram	2025-12-12 14:24:34 +00:00
Toby Jaffey	6878c5210f	Fix weird definition of NULL	2025-12-11 16:57:23 +00:00
Toby Jaffey	3f21335fc3	Test that repeatedly stopping and starting results in executing exactly the same number of VM instructions	2025-12-11 13:16:46 +00:00
Toby Jaffey	9ca720d35c	auto-generate Arduino example, to keep in sync	2025-12-11 11:05:44 +00:00
Toby Jaffey	7a1656ab10	Handle 8, 16 and 32 bit accesses to extram.	2025-12-11 10:33:45 +00:00
Toby Jaffey	b55c2bc88a	Add system for memory mapping a block of memory from the host.	2025-12-11 02:36:46 +00:00
Toby Jaffey	b83fc74c8d	Align stack pointer to 16 bytes, needed if UVM32_MEMORY_SIZE is not multiple of 16. ... On memory rd trap, set appropriate error code	2025-12-10 23:27:24 +00:00
Toby Jaffey	ac1975a820	Test metering, prove that system can resume after a hang error with a range of meter sizes	2025-12-10 22:30:19 +00:00
Toby Jaffey	508d41c8c5	Remove stackoverflow error, have one CORE_INTERNAL error for catastrophic crash	2025-12-10 18:42:34 +00:00
Toby Jaffey	da7f70c456	Initial test framework ... Clean up makefiles Everything buildable under docker (or natively)	2025-12-10 16:36:33 +00:00
Toby Jaffey	e07eeab043	Make yield a regular syscall taking an argument. ... Allows "wait for interrupt"/"wait for event" type operation where VM code blocks until the host has something for it.	2025-12-10 10:35:18 +00:00
Toby Jaffey	9baedb42e8	Add a stack canary, setup on boot	2025-12-10 01:00:36 +00:00
Toby Jaffey	ac554865a6	Make ROM const	2025-12-09 22:08:53 +00:00
Toby Jaffey	76fba39a21	Rework syscall ABI. ... Syscalls now accept two parameters, allowing for things like "int count = read(buf, len)" Rather than providing safe signatures for syscalls, the user is now given helper functions to safely parse incoming values, c-strings and slices.	2025-12-09 21:51:35 +00:00
Toby Jaffey	8c11b45670	Move CPU core out of RAM. This limits possibilities for self-modifying code hacks, but is cleaner/safer.	2025-12-09 10:46:29 +00:00
Toby Jaffey	9be9e056cd	Use internal memcpy/memset	2025-12-08 23:48:50 +00:00
Toby Jaffey	ee2ba56423	Add cmdline option to host <file.bin> [max_instrs_to_run], to set instruction meter. ... Allow a host to continue after a hung error, if it wants to. So, a program with while(1) {} can be run indefinitely.	2025-12-08 20:36:00 +00:00
Toby Jaffey	c691c3ebdf	Fix overly long event name	2025-12-08 13:04:05 +00:00
Toby Jaffey	a3c8b7584d	Remove debug	2025-12-08 12:54:30 +00:00
Toby Jaffey	9d6e6790e1	Cleanup syscall numbers	2025-12-08 12:53:33 +00:00
Toby Jaffey	61fe0e8647	Rename ioreq to syscall	2025-12-08 12:26:47 +00:00
Toby Jaffey	f6cd790fcb	ABI info	2025-12-08 07:31:21 +00:00
Toby Jaffey	751f068486	Rework host/target interface to use ecall and proper syscalls instead of CSRs	2025-12-08 02:44:38 +00:00
Toby Jaffey	af3b48cb01	Fix comment, uvm32_reset() doesn't exist	2025-12-07 13:13:36 +00:00
Toby Jaffey	f235265e3f	Set stack pointer to before core registers in RAM	2025-12-07 00:59:35 +00:00
Toby Jaffey	047c9e3853	Move error strings out of header, to prevent unused warning	2025-12-06 21:35:00 +00:00
Toby Jaffey	c9d30b6d28	uvm32 initial version	2025-12-06 16:44:23 +00:00