Changelog

2026-06-29 — Assembler parse_int whitespace fix

Bug: The assembler’s parse_int() function did not handle leading whitespace. The occ codegen emits parameter loads like [ebp + 8] (with a space after +). parse_int(" 8") failed on the space character, causing the offset to default to 0. This meant [ebp + 8] was assembled as [ebp + 0] — reading the saved frame pointer instead of the actual function argument.

Every function parameter access [ebp + 8], [ebp + 12], etc. silently read the wrong stack slot, so add(3, 4) returned a garbage address (the old EBP) instead of 7.

Fix: Added whitespace skipping at the start of parse_int(). Made hex/decimal parsing loops tolerate trailing whitespace.

Files: src/kernel/apps/asm.c

2026-06-29 — Ring 3 page fault fixes

Bug: Running occ-generated code via the user command caused page fault (INT 14, error code 0x5, CR2=0x10d4a9). User-mode code could not call into kernel-only pages because the user page directory stripped PTE_USER from PDE 0 (identity-mapped kernel pages at 0-4MB).

Fixes:

Mark PDE 0 entries as user-accessible (|= PTE_USER) in user page directory
Added symbol remapping in assembler for user mode (_printf → _usr_printf, etc.)
run_user_test now calls asm_assemble_user() instead of asm_assemble()

Files: src/kernel/core/paging.c, src/kernel/apps/asm.c, src/kernel/tasks/task_user.c, include/asm.h

2026-06-29 — Codegen entry trampoline

Bug: Generated assembly started execution at the first function in the file (e.g. _add) instead of _main. Without an explicit entry point, the program returned immediately without ever reaching main().

Fix: Added call _main; ret trampoline at the start of codegen output.

File: src/kernel/lib/codegen.c

2026-06-29 — AST_ASSIGNMENT fall-through

Bug: Missing break in the gen_statement switch caused assignment expressions to fall through into the AST_IF case, corrupting codegen for assignment statements.