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2021-04-05xtensa: ISS: add GDBIO implementation to semihosting interfaceMax Filippov1-0/+36
Add GDBIO implementation for the xtensa semihosting interface. It offers less functions than the simcall interface, so make some semihosting functions optional and return error when implementation is not available. Add Kconfig menu to select semihosting implementation and add simcall and GDBIO choices there. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2021-04-05xtensa: ISS: split simcall implementation from semihosting interfaceMax Filippov1-68/+2
Disconnect existing ISS simcall implementation from the semihosting interface to allow for alternative implementations selectable at configure time. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2021-04-05xtensa: simcall.h: Change compitible to compatibleBhaskar Chowdhury1-1/+1
s/compitible/compatible/ Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Message-Id: <20210326012739.18038-1-unixbhaskar@gmail.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2020-02-07Merge tag 'xtensa-20200206' of git://github.com/jcmvbkbc/linux-xtensaLinus Torvalds1-5/+3
Pull xtensa updates from Max Filippov: - reorganize exception vectors placement - small cleanups (drop unused functions/headers/defconfig entries, spelling fixes) * tag 'xtensa-20200206' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: ISS: improve simcall assembly xtensa: reorganize vectors placement xtensa: separate SMP and XIP support xtensa: move fast exception handlers close to vectors arch/xtensa: fix Kconfig typos for HAVE_SMP xtensa: clean up optional XCHAL_* definitions xtensa: drop unused function fast_coprocessor_double xtensa: drop empty platform_* functions from platforms xtensa: clean up platform headers xtensa: drop set_except_vector declaration xtensa: configs: Cleanup old Kconfig IO scheduler options
2020-02-05xtensa: ISS: improve simcall assemblyMax Filippov1-5/+3
Drop redundant result moving from inline assembly, use a1 and b1 values as return value and errno value respectively. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2019-12-18xtensa: ISS: avoid struct timevalArnd Bergmann1-2/+2
'struct timeval' will get removed from the kernel, change the one user in arch/xtensa to avoid referencing it, by using a fixed-length array instead. Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2017-03-13xtensa: ISS: add argc/argv simcall definitionsMax Filippov1-0/+20
There are three simcalls implemented by ISS and QEMU related to argc/argv processing: SYS_iss_argc (get number of command line arguments), SYS_iss_argv_size (get size of command line argument block) and SYS_iss_set_argv (copy command line arguments to virtual guest address). Add definitions for these calls to iss/include/platform/simcall.h Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2016-09-21xtensa: ISS: define simc_exit and use it instead of inline asmMax Filippov1-0/+5
A number of ISS platform functions use inline assembly to invoke simulator exit, not all correctly. Define simc_exit(exit_code) and use it instead of inline assembly. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2013-05-09xtensa: don't use a7 in simcallsMax Filippov1-11/+13
To support FRAME_POINTER avoid using a7 in __simc (none of the existing simcalls needs it). Replace calls to __simc with more specific simc_read, simc_write and simc_lseek calls. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2012-12-19xtensa: properly fix missing compiler barrier in simcallMax Filippov1-6/+1
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2012-10-16xtensa: ISS: fix specific simcallsMax Filippov1-2/+7
Simcalls that take memory buffer definitely need wmb or rmb to make sure gcc doesn't optimize away code that fills the buffer. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2012-10-04xtensa: ISS: fix __simc implementationMax Filippov1-0/+53
Do not rely on compiler implicitly placing function arguments into specifc registers, place them explicitly. Move __simc and related helpers to platform/simcall.h Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
2008-11-06xtensa: move headers files to arch/xtensa/includeChris Zankel1-0/+62
Move all header files for xtensa to arch/xtensa/include and platform and variant header files to the appropriate arch/xtensa/platforms/ and arch/xtensa/variants/ directories. Moving the files gets also rid of all uses of symlinks in the Makefile. This has been completed already for the majority of the architectures and xtensa is one out of six missing. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Chris Zankel <chris@zankel.net>
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