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Update the simulator README.txt file

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Gregory Nutt 2015-09-24 14:53:30 -06:00
parent 508a55f6be
commit 94a014085a
1 changed files with 40 additions and 13 deletions
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53
configs/sim/README.txt
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@ -175,21 +175,48 @@ X11. See the discussion "Stack Size Issues" above.
Cygwin64 Issues
---------------
Since using Cygwin64, I have been unable to use the simulator. When I try
to run nutt.exe from the command line, it exists silently. Running with GDB
I get following (before hitting a breakpoint at main()):
There are some additional issues using the simulator with Cygwin64. Below is the
summary of the changes that I had to make to get the simulator working in that
environment:
(gdb) r
Starting program: /cygdrive/c/Users/Gregory/Documents/projects/nuttx/master/nuttx/nuttx.exe
[New Thread 6512.0xda8]
[New Thread 6512.0x998]
1 [main] nuttx 6512 C:\Users\Gregory\Documents\projects\nuttx\master\nuttx\nuttx.exe: *** fatal error - Internal error: Out of memory for new path buf.
736 [main] nuttx 6512 cygwin_exception::open_stackdumpfile: Dumping stack trace to nuttx.exe.stackdump
[Thread 6512.0x998 exited with code 256]
[Inferior 1 (process 6512) exited with code 0400]
CONFIG_SIM_CYGWIN_DECORATED=n
Older versions of Cygwin toolsdecorated C symbol names by adding an
underscore to the beginning of the symbol name. Newer versions of
Cygwin do not seem to do this. Deselecting CONFIG_SIM_CYGWIN_DECORATED
will select the symbols without the leading underscore as needed by
the Cygwin64 toolchain.
Still clueless on this one. The simulator used to work great with an older,
32-bit Cygwin version. I currently use only Linux to test with the Simulator.
How do you know if you need this option? You could look at the generated
symbol tables to see if there are underscore characters at the beginning
of the symbol names. Or, if you need this option, the simulation will not
run: It will crash early, probably in some function due to the failure to
allocate memory.
In this case, when I tried to run nutt.exe from the command line, it
exited silently. Running with GDB I get following (before hitting a
breakpoint at main()):
(gdb) r
Starting program: /cygdrive/c/Users/Gregory/Documents/projects/nuttx/master/nuttx/nuttx.exe
[New Thread 6512.0xda8]
[New Thread 6512.0x998]
1 [main] nuttx 6512 C:\Users\Gregory\Documents\projects\nuttx\master\nuttx\nuttx.exe: *** fatal error - Internal error: Out of memory for new path buf.
736 [main] nuttx 6512 cygwin_exception::open_stackdumpfile: Dumping stack trace to nuttx.exe.stackdump
[Thread 6512.0x998 exited with code 256]
[Inferior 1 (process 6512) exited with code 0400]
CONFIG_SIM_X8664_SYSTEMV=n
CONFIG_SIM_X8664_MICROSOFT=y
Selet Microsoft x64 calling convention.
The Microsoft x64 calling convention is followed on Microsoft Windows and
pre-boot UEFI (for long mode on x86-64). It uses registers RCX, RDX, R8,
R9 for the first four integer or pointer arguments (in that order), and
XMM0, XMM1, XMM2, XMM3 are used for floating point arguments. Additional
arguments are pushed onto the stack (right to left). Integer return
values (similar to x86) are returned in RAX if 64 bits or less. Floating
point return values are returned in XMM0. Parameters less than 64 bits
long are not zero extended; the high bits are not zeroed.
BASIC
^^^^^