diff options
Diffstat (limited to 'mu-init.subx')
| -rw-r--r-- | mu-init.subx | 45 |
1 files changed, 38 insertions, 7 deletions
diff --git a/mu-init.subx b/mu-init.subx index fb15efbf..2377822e 100644 --- a/mu-init.subx +++ b/mu-init.subx @@ -3,7 +3,7 @@ # See translate_mu for how this file is used. # # Mu programs start at a function called 'main' with this signature: -# fn main args: (addr array kernel-string) -> exit-status/ebx: int +# fn main args: (addr array (addr array byte)) -> exit-status/ebx: int # If your program doesn't need commandline arguments you can drop it: # fn main -> exit-status/ebx: int # @@ -15,11 +15,42 @@ Entry: # we don't use ebp in Entry; just initialize it bd/copy-to-ebp 0/imm32 - # var args/eax: (addr array kernel-string) - 89/<- %eax 4/r32/esp - # initialize the heap + # - save argc and argv + # var argc-and-argv/esi + 89/<- %esi 4/r32/esp +$Entry:initialize-heap: + # - initialize the heap (new-segment *Heap-size Heap) - # run Mu program - (main %eax) - # exit +$Entry:initialize-args: + # - convert argv from null-terminated 'kernel' strings to length-prefixed Mu strings + # var argc/edx: int + 8b/-> *esi 2/r32/edx + # argc is in words; convert it to bytes + c1/shift 4/subop/left %edx 2/imm8 + # var args/edi: (addr array (addr array byte)) + (allocate-array Heap %edx) # => eax + 89/<- %edi 0/r32/eax + # var curr/ecx: (addr kernel-string) = argv + 8d/copy-address *(esi+4) 1/r32/ecx + # var max/edx: (addr kernel-string) = argv+4+argc + 8d/copy-address *(ecx+edx) 2/r32/edx + # var dest/esi: (addr (addr array byte)) = args+4 + 8d/copy-address *(edi+4) 6/r32/esi + { + # if (curr >= max) break + 39/compare %ecx 2/r32/edx + 73/jump-if-addr>= break/disp8 + # *dest = kernel-string-to-string(*curr) + (kernel-string-to-string Heap *ecx) # => eax + 89/<- *esi 0/r32/eax + # curr += 4 + 81 0/subop/add %ecx 4/imm32 + # dest += 4 + 81 0/subop/add %esi 4/imm32 + # + eb/jump loop/disp8 + } + # - run Mu program + (main %edi) # => ebx + # - exit (syscall_exit) |