mirror of
git://projects.qi-hardware.com/iris.git
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305 lines
11 KiB
COBOL
305 lines
11 KiB
COBOL
#pypp 0
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// Iris: micro-kernel for a capability-based operating system.
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// source/elfrun.ccp: Process creation server.
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// Copyright 2009 Bas Wijnen <wijnen@debian.org>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "devices.hh"
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#include "iris.hh"
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#include <elf.h>
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static unsigned _free
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extern unsigned _end
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void init_alloc ():
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_free = ((unsigned)&_end + PAGE_SIZE - 1) & PAGE_MASK
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char *alloc_space (unsigned pages):
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unsigned ret = (_free + PAGE_SIZE - 1) & PAGE_MASK
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_free = ret + (pages << PAGE_BITS)
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return (char *)ret
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void *operator new[] (unsigned size):
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//kdebug ("new ")
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void *ret = (void *)_free
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size = (size + 3) & ~3
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unsigned rest = PAGE_SIZE - (((_free - 1) & ~PAGE_MASK) + 1)
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if rest < size:
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unsigned pages = ((size - rest) + PAGE_SIZE - 1) >> PAGE_BITS
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for unsigned p = 0; p < pages; ++p:
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Iris::Page page = Iris::my_memory.create_page ()
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page.set_flags (Iris::Page::PAYING | Iris::Page::FRAME)
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Iris::my_memory.map (page, _free + rest + (p << PAGE_BITS))
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Iris::free_cap (page)
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_free += size
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//kdebug_num ((unsigned)ret)
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//kdebug ("+")
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//kdebug_num (size)
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//kdebug ("\n")
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return ret
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void *operator new (unsigned size):
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return new char[size]
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static Iris::Memory parent_memory
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static Iris::Cap parent
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static unsigned slot
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static char *mapping
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static unsigned pages
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static Iris::Caps pages_caps
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static Iris::Memory mem
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static unsigned *bss_mapping
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static Iris::Page bss_page
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static Iris::Caps map_string (Iris::String data):
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// Get the size.
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Iris::Num size = data.get_size ()
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if size.value () == 0:
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Iris::panic (0, "data string is empty")
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// Allocate a caps with all the pages.
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pages = (size.value () + PAGE_SIZE - 1) >> PAGE_BITS
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pages_caps = Iris::my_memory.create_caps (pages)
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slot = pages_caps.use ()
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// Map them into the address space as well.
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mapping = alloc_space (pages)
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// Create a memory for the program.
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mem = parent_memory.create_memory ()
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// Load the file into memory and map it.
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for unsigned p = 0; p < pages; ++p:
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//kdebug_num (p)
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//kdebug ("/")
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//kdebug_num (pages)
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//kdebug ("\n")
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Iris::set_recv_arg (Iris::Cap (slot, p))
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data.get_block (p << PAGE_BITS)
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Iris::my_memory.map (Iris::Cap (slot, p), (unsigned)&mapping[p << PAGE_BITS])
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static Iris::Caps map_caps (Iris::Caps data, unsigned p):
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// Get the size.
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if p == 0:
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Iris::panic (0, "data caps is empty")
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// Allocate a new caps with all the pages for mapping locally.
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pages = p
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pages_caps = Iris::my_memory.create_caps (pages)
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slot = pages_caps.use ()
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unsigned src_slot = data.use ()
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// Map them into the address space as well.
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mapping = alloc_space (pages)
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// Create a memory for the program.
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mem = parent_memory.create_memory ()
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// Load the file into memory and map it.
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for unsigned p = 0; p < pages; ++p:
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//kdebug_num (p)
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//kdebug ("/")
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//kdebug_num (pages)
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//kdebug ("\n")
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Iris::Page page = Iris::Cap (slot, p)
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Iris::set_recv_arg (page)
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Iris::my_memory.create_page ()
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Iris::Page (Iris::Cap (src_slot, p)).share (page)
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Iris::my_memory.map (page, (unsigned)&mapping[p << PAGE_BITS])
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Iris::free_slot (src_slot)
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static Iris::Caps run (Iris::Caps data, Iris::Memory parent_memory, Iris::Cap parent, unsigned num_slots, unsigned num_caps):
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Iris::Thread thread = mem.create_thread (num_slots)
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Elf32_Ehdr *header = (Elf32_Ehdr *)mapping
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for unsigned j = 0; j < SELFMAG; ++j:
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if header->e_ident[j] != ELFMAG[j]:
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Iris::panic (header->e_ident[j], "invalid ELF magic")
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return Iris::Caps ()
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if header->e_ident[EI_CLASS] != ELFCLASS32:
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kdebug ("invalid ELF class:")
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kdebug_num (header->e_ident[EI_CLASS])
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kdebug (" != ")
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kdebug_num (ELFCLASS32)
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kdebug ("\n")
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Iris::panic (0)
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return Iris::Caps ()
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if header->e_ident[EI_DATA] != ELFDATA2LSB:
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Iris::panic (header->e_ident[EI_DATA], "invalid ELF data")
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if header->e_ident[EI_VERSION] != EV_CURRENT:
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Iris::panic (header->e_ident[EI_VERSION], "invalid ELF version")
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if header->e_type != ET_EXEC:
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Iris::panic (header->e_type, "invalid ELF type")
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if header->e_machine != EM_MIPS_RS3_LE && header->e_machine != EM_MIPS:
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Iris::panic (header->e_machine, "invalid ELF machine")
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thread.set_pc (header->e_entry)
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thread.set_sp (0x80000000)
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for unsigned section = 0; section < header->e_shnum; ++section:
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Elf32_Shdr *shdr = (Elf32_Shdr *)((unsigned)mapping + header->e_shoff + section * header->e_shentsize)
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if ~shdr->sh_flags & SHF_ALLOC:
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continue
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bool readonly = !(shdr->sh_flags & SHF_WRITE)
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//bool executable = shdr->sh_flags & SHF_EXEC_INSTR
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if shdr->sh_type != SHT_NOBITS:
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//kdebug ("loading ")
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//kdebug_num (shdr->sh_addr)
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//kdebug ("+")
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//kdebug_num (shdr->sh_size)
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//kdebug ("\n")
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unsigned file_offset = shdr->sh_offset >> PAGE_BITS
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if (file_offset + ((shdr->sh_size + PAGE_SIZE - 1) >> PAGE_BITS)) >= (PAGE_SIZE >> 2):
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kdebug ("thread size: ")
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kdebug_num (file_offset)
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kdebug (",")
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kdebug_num (shdr->sh_size)
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kdebug ("\n")
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Iris::panic (shdr->sh_size, "thread too large")
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return Iris::Caps ()
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for unsigned p = (shdr->sh_addr & PAGE_MASK); p < shdr->sh_addr + shdr->sh_size; p += PAGE_SIZE:
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unsigned section_offset = (p - (shdr->sh_addr & PAGE_MASK)) >> PAGE_BITS
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unsigned idx = file_offset + section_offset
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Iris::Page page = mem.mapping ((void *)p)
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if Iris::recv.data[0].l == Iris::NO_ERROR:
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// The address already has a mapping; assume that it is correct.
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Iris::free_cap (page)
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continue
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Iris::free_cap (page)
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page = mem.create_page ()
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unsigned f
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if readonly:
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f = Iris::Page::PAYING | Iris::Page::MAPPED_READONLY
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else:
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f = Iris::Page::PAYING
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page.set_flags (f)
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Iris::Page (slot, idx).share (page, 0)
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//kdebug ("mapping at ")
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//kdebug_num (p)
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//if readonly:
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// kdebug (" (readonly)")
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//kdebug ("\n")
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if !mem.map (page, p):
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Iris::panic (0, "unable to map page")
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return Iris::Caps ()
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Iris::free_cap (page)
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else:
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if readonly:
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Iris::panic (0, "unwritable bss section")
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return Iris::Caps ()
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//kdebug ("clearing ")
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//kdebug_num (shdr->sh_addr)
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//kdebug ("+")
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//kdebug_num (shdr->sh_size)
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//kdebug ("\n")
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for unsigned p = (shdr->sh_addr & PAGE_MASK); p < shdr->sh_addr + shdr->sh_size; p += PAGE_SIZE:
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Iris::Page page = mem.mapping ((void *)p)
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if Iris::recv.data[0].l == Iris::NO_ERROR:
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// No error means there is a mapping.
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page.share (bss_page, 0)
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Iris::free_cap (page)
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for unsigned a = p; a < ((p + PAGE_SIZE) & PAGE_MASK); a += 4:
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if a >= shdr->sh_addr + shdr->sh_size:
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break
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if a < shdr->sh_addr:
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continue
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bss_mapping[(a & ~PAGE_MASK) >> 2] = 0
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else:
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Iris::free_cap (page)
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page = mem.create_page ()
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if Iris::recv.data[0].l != Iris::NO_ERROR:
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Iris::panic (Iris::recv.data[0].l, "out of memory")
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if !page.set_flags (Iris::Page::PAYING | Iris::Page::FRAME):
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Iris::panic (0, "out of memory")
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if !mem.map (page, p):
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Iris::panic (0, "unable to map bss page")
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Iris::free_cap (page)
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//kdebug ("start of program:\n")
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//for unsigned i = 0; i < 0x40; i += 4:
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// kdebug_num ((unsigned)mapping + 4 * i, 3)
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// kdebug (" ==>")
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// for unsigned j = 0; j < 4; j += 1:
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// kdebug (" ")
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// kdebug_num (((unsigned *)mapping)[i + j])
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// kdebug ("\n")
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for unsigned p = 0; p < pages; ++p:
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Iris::my_memory.destroy (Iris::Page (slot, p))
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Iris::my_memory.destroy (pages_caps)
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Iris::free_slot (slot)
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Iris::free_cap (pages_caps)
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Iris::Page stackpage = mem.create_page ()
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stackpage.set_flags (Iris::Page::PAYING | Iris::Page::FRAME)
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if Iris::recv.data[0].l != Iris::NO_ERROR || !mem.map (stackpage, 0x7ffff000):
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Iris::panic (Iris::recv.data[0].l, "unable to map initial stack page")
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Iris::free_cap (stackpage)
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Iris::Caps caps = mem.create_caps (num_caps)
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thread.use (caps, 0)
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thread.set_info (Iris::Thread::A0, num_slots)
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thread.set_info (Iris::Thread::A1, num_caps)
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Iris::Receiver receiver = mem.create_receiver ()
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receiver.set_owner (thread.copy ())
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Iris::Cap call = receiver.create_call_capability ()
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caps.set (__caps_num, caps.copy ())
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caps.set (__receiver_num, receiver.copy ())
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caps.set (__thread_num, thread.copy ())
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caps.set (__memory_num, mem.copy ())
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caps.set (__call_num, call.copy ())
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caps.set (__parent_num, parent.copy ())
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Iris::free_cap (receiver)
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Iris::free_cap (thread)
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Iris::free_cap (mem)
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Iris::free_cap (call)
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return caps
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Iris::Num start ():
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kdebug ("elfrun started.\n")
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init_alloc ()
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Iris::Elfrun dev = Iris::my_receiver.create_capability (0)
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Iris::my_parent.provide_capability <Iris::Elfrun> (dev.copy ())
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Iris::free_cap (dev)
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bss_mapping = (unsigned *)alloc_space (1)
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bss_page = Iris::my_memory.create_page ()
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Iris::my_memory.map (bss_page, (unsigned)bss_mapping)
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while true:
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Iris::wait ()
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Iris::Cap reply = Iris::get_reply ()
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Iris::Cap arg = Iris::get_arg ()
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switch Iris::recv.data[0].l:
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case Iris::Elfrun::RUN_STRING:
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unsigned num_slots = Iris::recv.data[1].l
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unsigned num_caps = Iris::recv.data[1].h
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parent_memory = Iris::Caps (arg).get (Iris::Elfrun::PARENT_MEMORY)
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parent = Iris::Caps (arg).get (Iris::Elfrun::PARENT)
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Iris::String data = Iris::Caps (arg).get (Iris::Elfrun::DATA)
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map_string (data)
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Iris::Caps ret = run (data, parent_memory, parent, num_slots, num_caps)
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reply.invoke (0, 0, ret.copy ())
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free_cap (ret)
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free_cap (parent_memory)
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free_cap (parent)
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free_cap (data)
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break
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case Iris::Elfrun::RUN_CAPS:
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unsigned num_slots = Iris::recv.data[1].l
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unsigned num_caps = Iris::recv.data[1].h
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unsigned p = Iris::recv.data[0].h
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parent_memory = Iris::Caps (arg).get (Iris::Elfrun::PARENT_MEMORY)
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parent = Iris::Caps (arg).get (Iris::Elfrun::PARENT)
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Iris::Caps data = Iris::Caps (arg).get (Iris::Elfrun::DATA)
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map_caps (data, p)
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Iris::Caps ret = run (data, parent_memory, parent, num_slots, num_caps)
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reply.invoke (0, 0, ret.copy ())
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free_cap (ret)
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free_cap (parent_memory)
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free_cap (parent)
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free_cap (data)
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break
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default:
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Iris::panic (0, "invalid operation for elfrun")
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reply.invoke (~0)
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break
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Iris::free_cap (arg)
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Iris::free_cap (reply)
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