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__clear_cache causes a compile error when using clang. Instead use
__builtin___clear_cache which is available under both gcc and clang.
Also replace tabs with spaces in this section of code (introduced by a
previous commit).
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Comes from https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/caches-and-self-modifying-code
This fixes a crash when running MicroPython using qemu-arm.
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This commit adds support for saving and loading .mpy files that contain
native code (native, viper and inline-asm). A lot of the ground work was
already done for this in the form of removing pointers from generated
native code. The changes here are mainly to link in qstr values to the
native code, and change the format of .mpy files to contain native code
blocks (possibly mixed with bytecode).
A top-level summary:
- @micropython.native, @micropython.viper and @micropython.asm_thumb/
asm_xtensa are now allowed in .py files when compiling to .mpy, and they
work transparently to the user.
- Entire .py files can be compiled to native via mpy-cross -X emit=native
and for the most part the generated .mpy files should work the same as
their bytecode version.
- The .mpy file format is changed to 1) specify in the header if the file
contains native code and if so the architecture (eg x86, ARMV7M, Xtensa);
2) for each function block the kind of code is specified (bytecode,
native, viper, asm).
- When native code is loaded from a .mpy file the native code must be
modified (in place) to link qstr values in, just like bytecode (see
py/persistentcode.c:arch_link_qstr() function).
In addition, this now defines a public, native ABI for dynamically loadable
native code generated by other languages, like C.
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The maximum index into mp_fun_table is currently less than 1024 and should
stay that way to keep things efficient for all architectures, so there is
no need to handle loading the pointer directly via a literal in this
function.
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Useful for position independent code, and implementing state machines.
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All callers of the asm entry function guarantee that num_locals>=0, so no
need to add an explicit check for it. Use an assertion instead.
Also, the signature of asm_x86_entry is changed to match the other asm
entry functions.
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There were several different spellings of MicroPython present in comments,
when there should be only one.
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For all but the last pass the assembler only needs to count how much space
is needed for the machine code, it doesn't actually need to emit anything.
The dummy_data just uses unnecessary RAM and without it the code is not
any more complex (and code size does not increase for Thumb and Xtensa
archs).
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All assemblers should "derive" from mp_asm_base_t.
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The code was apparently broken after 9988618e0e0f5c319e31b135d993e22efb593093
"py: Implement full func arg passing for native emitter.". This attempts to
propagate those changes to ARM emitter.
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Previously was allocating at end of PASS_COMPUTE, and this pass was
being run twice, so memory was being allocated twice.
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Addresses issue #1022.
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Viper can now do: ptr8(buf)[0], which loads a byte from a buffer using
machine instructions.
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This included a bit of restructuring of the assembler backends. Note
that the ARM backend is missing a few functions and won't compile.
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This gets ARM native emitter working againg and addresses issue #858.
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And move the MAP_ANON redefinition from py/asmx64.c to unix/alloc.c.
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MP_PLAT_FREE_EXEC macros
Fixes issue #840
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