ilo-pona/xv6-65oo2
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41 commits

Author SHA1 Message Date
Peter H. Froehlich e916d668f7 Fix unsigned conversion bug. 
Since readi() returns -1 for errors, checking with < against an unsigned
value is inadvisable. Checking with != works as intended however.
 2017-01-30 19:31:24 -05:00
Frans Kaashoek 33188666da Delete two left-over print statements 2016-09-14 21:13:09 -04:00
Frans Kaashoek 6670d3b5e0 Straight replacement of B_BUSY with a sleeping lock. 2016-09-11 17:24:04 -04:00
MikeCAT 5625ae4973 add check for wrapping of address + size in exec() 2016-08-25 07:09:46 -04:00
MikeCAT 67a7f9597e add alignment check of virtual address to exec() 2016-08-25 07:09:10 -04:00
Robert Morris 71453f72f2 a start at concurrent FS system calls 2014-08-27 17:15:30 -04:00
Robert Morris 2c56547272 every iput() and namei() must be inside a transaction 2014-08-04 13:06:48 -04:00
Frans Kaashoek 4ce832ddd2 Remove unused argument to setupkvm (thanks to Peter Froehlich) 2012-08-22 20:19:37 -04:00
Austin Clements 549c62cc1c I can't do math; fix bug introduced in 5a9761 2011-09-03 10:21:51 -04:00
Austin Clements 5a97613bab Fit exec on a page. Again 2011-09-02 15:27:41 -04:00
Austin Clements 2eb214c9db clear_pte_u -> clearpteu 2011-09-02 14:37:04 -04:00
Robert Morris 371ab7fa96 inaccessible page under the user stack page, to help exec deal w/ too-large args 2011-09-01 13:25:34 -04:00
Frans Kaashoek fa81545f1c Make elf proghdr fields match what objdump prints 2011-08-17 20:23:36 -04:00
Frans Kaashoek 66ba8079c7 Use static page table for boot, mapping first 4Mbyte; no more segment trick 
Allocate proper kernel page table immediately in main using boot allocator
Remove pginit
Simplify address space layout a tiny bit
More to come (e.g., superpages to simplify static table)
 2011-08-09 21:37:35 -04:00
Frans Kaashoek 9aa0337dc1 Map kernel high 
Very important to give qemu memory through PHYSTOP :(
 2011-07-29 07:31:27 -04:00
Russ Cox cf4b1ad90b xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
Russ Cox 1a81e38b17 make new code like old code 
Variable declarations at top of function,
separate from initialization.

Use == 0 instead of ! for checking pointers.

Consistent spacing around {, *, casts.

Declare 0-parameter functions as (void) not ().

Integer valued functions return -1 on failure, 0 on success.
 2011-01-11 13:01:13 -05:00
Robert Morris 2ea6c764c3 even more fabulous exec 2010-09-29 14:12:26 -04:00
Robert Morris 06feabecee check exec() arg length 
fix double iunlockput
 2010-09-27 16:17:57 -04:00
Robert Morris 4655d42e3b copyout() copies data to a va in a pagetable, for exec() &c 
usertest that passes too many arguments, break exec
 2010-09-27 16:14:33 -04:00
Robert Morris 05d66b0629 my comment is wrong, exec handles BSS fine 2010-09-19 13:47:52 -04:00
Robert Morris 4587b35847 exec questions 2010-09-19 07:18:42 -04:00
Austin Clements 79cd8b3eed Simplify allocuvm/deallocuvm to operate in a contiguous memory model. This makes their interface match up better with proc->sz and also simplifies the callers (it even gets the main body of exec on one page). 2010-09-02 18:28:36 -04:00
Austin Clements b1d41d6788 Remove the stack guard page. Processes are now contiguous from 0 to proc->sz, which means our syscall argument validation is correct. Add a pointer validation test and remove the stack test, which tested for the guard page. 2010-09-01 16:46:37 -04:00
Austin Clements 5efca9054f Tab police 2010-09-01 00:32:27 -04:00
Robert Morris c4cc10da7e fix corner cases in exec of ELF 
put an invalid page below the stack
have fork() handle invalid pages
 2010-08-06 11:12:18 -04:00
Frans Kaashoek af03ab142d a few nits 
passes all tests on two-processor smp
 2010-07-23 12:52:50 -04:00
Frans Kaashoek 4714c20521 Checkpoint page-table version for SMP 
Includes code for TLB shootdown (which actually seems unnecessary for xv6)
 2010-07-23 07:41:13 -04:00
Frans Kaashoek 40889627ba Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
Russ Cox 48755214c9 assorted fixes: 
* rename c/cp to cpu/proc
 * rename cpu.context to cpu.scheduler
 * fix some comments
 * formatting for printout
 2009-08-30 23:02:08 -07:00
Russ Cox 0aef891495 shuffle and tweak for formatting. 
pdf has very good page breaks now.
would be a good copy for fall 2009.
 2009-08-08 01:07:30 -07:00
Russ Cox b3bebfce8a exec tweaks 2009-07-13 09:34:45 -07:00
rsc 90bab90832 exec sanity check 2009-05-31 02:11:27 +00:00
rsc 19333efb9e Some proc cleanup, moving some of copyproc into allocproc. 
Also, an experiment: use "thread-local" storage for c and cp
instead of the #define macro for curproc[cpu()].
 2009-05-31 00:28:45 +00:00
rsc 71d5bf4d08 oops - broke arg counting 2007-08-30 18:19:52 +00:00
rsc c1bfbfa2f7 oops 2007-08-28 02:39:40 +00:00
rsc 558ab49f13 delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
rsc 629c1fe743 Edit exec. 
Do not commit to new memory image until
nothing can go wrong, avoiding bad2 case.

Be sure to allocate enough stack space for argv.

Load executable before initializing stack, to
keep ELF loops together.

Make argv loop clearer.
 2007-08-27 15:17:40 +00:00
rsc 07090dd705 Remove struct uinode. 
Remove type arg to mknod (assume T_DEV).
 2007-08-24 20:54:23 +00:00
rsc eaea18cb9c PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf 
Various changes made while offline.

 + bwrite sector argument is redundant; use b->sector.
 + reformatting of files for nicer PDF page breaks
 + distinguish between locked, unlocked inodes in type signatures
 + change FD_FILE to FD_INODE
 + move userinit (nee proc0init) to proc.c
 + move ROOTDEV to param.h
 + always parenthesize sizeof argument
 2007-08-22 06:01:32 +00:00
rsc f32f3638f4 Various cleanup: 
- Got rid of dummy proc[0].  Now proc[0] is init.
 - Added initcode.S to exec /init, so that /init is
   just a regular binary.
 - Moved exec out of sysfile to exec.c
 - Moved code dealing with fs guts (like struct inode)
   from sysfile.c to fs.c.  Code dealing with system call
   arguments stays in sysfile.c
 - Refactored directory routines in fs.c; should be simpler.
 - Changed iget to return *unlocked* inode structure.
   This solves the lookup-then-use race in namei
   without introducing deadlocks.
   It also enabled getting rid of the dummy proc[0].
 2007-08-21 19:22:08 +00:00