Re: [webkit-dev] jit for arm
From http://lists.webkit.org/: ListDescription webkit-help [no description available] Hmmm, yes, there would seem to be some scope to make that a little more descriptive! ;-) G. On Nov 17, 2009, at 11:46 PM, Zoltan Herczeg wrote: Hi, seems the original mail was sent to both webkit-dev and webkit-help. My reply was on webkit-help, and the discussion continued there. https://lists.webkit.org/pipermail/webkit-help/2009-November/000380.html Perhaps we should clarify better the purpose of these mailing lists, since if people can't decide which list is better for them, they do double posts. Zoltan On Nov 4, 2009, at 8:37 AM, ll Jefferry wrote: Hi, when i reading the jit for arm source code, i am not very clear the functionality of the flowing functions: ctiTrampoline This code is used when entering from the C runtime into JIT generated code. JIT generated code does not necessarily respect C calling conventions, so this routine sets up the stack frame, preserves registers, etc, as necessary to allow the JIT code to be run. ctiVMThrowTrampoline To perform certain operations the JIT will call back into C code. Usually the C callback can just return in a perfectly normal fashion and continue execution once it has completed, however in the case that an exception is thrown special handling is required to change the control flow. The return address of the C callback is instead changed to point to this, and this piece of code handles looking up the exception handler at which execution will be resumed. ctiOpThrowNotCaught This is used to from within cti_op_throw, which implements the 'throw' keyword in JavaScript. The cti_op_throw method will attempt to look up a handler routine that catches the exception. However if the exception is not caught it is necessary to force an early termination of JIT execution. The cti_op_throw C callback always modifies its return address, either to point to the code for the appropriate exception handler to catch the exception, or to ctiOpThrowNotCaught if no handler is found. could you explain to me? and another question is that: in cacheFlush function, why the system call number is 0xf0002? if it is defined by the toolchain? Zoltan, Gabor? thanks! BR, Jeff ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] jit for arm
Hi, when i reading the jit for arm source code, i am not very clear the functionality of the flowing functions: ctiTrampoline ctiVMThrowTrampoline ctiOpThrowNotCaught could you explain to me? and another question is that: in cacheFlush function, why the system call number is 0xf0002? if it is defined by the toolchain? thanks! BR, Jeff ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] jit for arm
On Nov 4, 2009, at 8:37 AM, ll Jefferry wrote: Hi, when i reading the jit for arm source code, i am not very clear the functionality of the flowing functions: ctiTrampoline This code is used when entering from the C runtime into JIT generated code. JIT generated code does not necessarily respect C calling conventions, so this routine sets up the stack frame, preserves registers, etc, as necessary to allow the JIT code to be run. ctiVMThrowTrampoline To perform certain operations the JIT will call back into C code. Usually the C callback can just return in a perfectly normal fashion and continue execution once it has completed, however in the case that an exception is thrown special handling is required to change the control flow. The return address of the C callback is instead changed to point to this, and this piece of code handles looking up the exception handler at which execution will be resumed. ctiOpThrowNotCaught This is used to from within cti_op_throw, which implements the 'throw' keyword in JavaScript. The cti_op_throw method will attempt to look up a handler routine that catches the exception. However if the exception is not caught it is necessary to force an early termination of JIT execution. The cti_op_throw C callback always modifies its return address, either to point to the code for the appropriate exception handler to catch the exception, or to ctiOpThrowNotCaught if no handler is found. could you explain to me? and another question is that: in cacheFlush function, why the system call number is 0xf0002? if it is defined by the toolchain? Zoltan, Gabor? thanks! BR, Jeff ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] jit for arm
Hi, seems the original mail was sent to both webkit-dev and webkit-help. My reply was on webkit-help, and the discussion continued there. https://lists.webkit.org/pipermail/webkit-help/2009-November/000380.html Perhaps we should clarify better the purpose of these mailing lists, since if people can't decide which list is better for them, they do double posts. Zoltan On Nov 4, 2009, at 8:37 AM, ll Jefferry wrote: Hi, when i reading the jit for arm source code, i am not very clear the functionality of the flowing functions: ctiTrampoline This code is used when entering from the C runtime into JIT generated code. JIT generated code does not necessarily respect C calling conventions, so this routine sets up the stack frame, preserves registers, etc, as necessary to allow the JIT code to be run. ctiVMThrowTrampoline To perform certain operations the JIT will call back into C code. Usually the C callback can just return in a perfectly normal fashion and continue execution once it has completed, however in the case that an exception is thrown special handling is required to change the control flow. The return address of the C callback is instead changed to point to this, and this piece of code handles looking up the exception handler at which execution will be resumed. ctiOpThrowNotCaught This is used to from within cti_op_throw, which implements the 'throw' keyword in JavaScript. The cti_op_throw method will attempt to look up a handler routine that catches the exception. However if the exception is not caught it is necessary to force an early termination of JIT execution. The cti_op_throw C callback always modifies its return address, either to point to the code for the appropriate exception handler to catch the exception, or to ctiOpThrowNotCaught if no handler is found. could you explain to me? and another question is that: in cacheFlush function, why the system call number is 0xf0002? if it is defined by the toolchain? Zoltan, Gabor? thanks! BR, Jeff ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] JIT for arm is dependant on gcc
Hi, these entry/leave functions are implemented in assembly for all ports. It is faster this way. (Previously, the jit generated these functions, but the reviewers convinced us to do this way). External .asm files would be a nightmare, since we have to create (and maintain) the build rules for all ports. Is is difficult to implement these functions for your assembler? They are simple code fragments. Zoltan I've noticed that there are three functions that use inline gcc assembler for compiling JIT for ARM_TRADITIONAL. Is it possible for these to be reworked using the macro assembler so that JIT can be compiled without the gcc toolchain dependency for arm? (sp. I am using armasm from Microsoft?). Alternatively, perhaps this could be moved to an external .asm or .s file. This looks like it has been done for PaintHooks.asm; so maybe something similar to that. These are the functions that I am missing trying to build JIT: CacheFlush, ctiTrampoline, ctiVMThrowTrampoline ctiOpThrowNotCaught If there is a way to compile JIT without these dependencies please let me know. Thanks, Jason. ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] JIT for arm is dependant on gcc
The Microsoft ARM toolchain does not support inline assembler so I'm unable to compile any inline assembler. I'm trying to understand how to make these functions external but it doesn't appear to be straightforward (e.g. The first problem I hit was that the asm push instruction is unknown, also svc must be renamed swi and probably others. Also, I'm not able to easily create the pre/post stack frame for cacheflush as I haven't used 3 parameter assembler language before although I'm sure I could do this with a couple of hours research. Can you maybe show me how to get the jit to generate this for this toolchain? Jason. -Original Message- From: Zoltan Herczeg [mailto:zherc...@inf.u-szeged.hu] Sent: Wednesday, October 21, 2009 9:45 AM To: Jason Rukman Cc: webkit-dev@lists.webkit.org Subject: Re: [webkit-dev] JIT for arm is dependant on gcc Hi, these entry/leave functions are implemented in assembly for all ports. It is faster this way. (Previously, the jit generated these functions, but the reviewers convinced us to do this way). External .asm files would be a nightmare, since we have to create (and maintain) the build rules for all ports. Is is difficult to implement these functions for your assembler? They are simple code fragments. Zoltan I've noticed that there are three functions that use inline gcc assembler for compiling JIT for ARM_TRADITIONAL. Is it possible for these to be reworked using the macro assembler so that JIT can be compiled without the gcc toolchain dependency for arm? (sp. I am using armasm from Microsoft?). Alternatively, perhaps this could be moved to an external .asm or .s file. This looks like it has been done for PaintHooks.asm; so maybe something similar to that. These are the functions that I am missing trying to build JIT: CacheFlush, ctiTrampoline, ctiVMThrowTrampoline ctiOpThrowNotCaught If there is a way to compile JIT without these dependencies please let me know. Thanks, Jason. ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev ___ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
Re: [webkit-dev] JIT for arm is dependant on gcc
Hi,
sorry, I don't know anything about ms arm tools (ok, not just their arm
tools).
push/pop {regs} is an alias for stmdb/ldmia sp!, { regs }
I presume you use ms os, which means you have to implement the
cacheflush() for your own os as well. (The current implementation is
designed for Linux) Unfortunately the neccessary mcr instruction can only
be executed on supervisor level, so there is no platform independent way
to implement this important function.
Zoltan
The Microsoft ARM toolchain does not support inline assembler so I'm
unable to compile any inline assembler. I'm trying to understand how to
make these functions external but it doesn't appear to be straightforward
(e.g. The first problem I hit was that the asm push instruction is
unknown, also svc must be renamed swi and probably others. Also, I'm not
able to easily create the pre/post stack frame for cacheflush as I haven't
used 3 parameter assembler language before although I'm sure I could do
this with a couple of hours research.
Can you maybe show me how to get the jit to generate this for this
toolchain?
Jason.
-Original Message-
From: Zoltan Herczeg [mailto:zherc...@inf.u-szeged.hu]
Sent: Wednesday, October 21, 2009 9:45 AM
To: Jason Rukman
Cc: webkit-dev@lists.webkit.org
Subject: Re: [webkit-dev] JIT for arm is dependant on gcc
Hi,
these entry/leave functions are implemented in assembly for all ports. It
is faster this way. (Previously, the jit generated these functions, but
the reviewers convinced us to do this way).
External .asm files would be a nightmare, since we have to create (and
maintain) the build rules for all ports.
Is is difficult to implement these functions for your assembler? They are
simple code fragments.
Zoltan
I've noticed that there are three functions that use inline gcc
assembler for compiling JIT for ARM_TRADITIONAL. Is it possible for
these to be reworked using the macro assembler so that JIT can be
compiled without the gcc toolchain dependency for arm? (sp. I am using
armasm from Microsoft?).
Alternatively, perhaps this could be moved to an external .asm or .s
file. This looks like it has been done for PaintHooks.asm; so maybe
something similar to that.
These are the functions that I am missing trying to build JIT:
CacheFlush, ctiTrampoline, ctiVMThrowTrampoline ctiOpThrowNotCaught
If there is a way to compile JIT without these dependencies please let
me know.
Thanks,
Jason.
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