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* [PATCH v2 00/14] RISCV basic exception handling implementation
@ 2023-01-27 13:59 Oleksii Kurochko
  2023-01-27 13:59 ` [PATCH v2 01/14] xen/riscv: add _zicsr to CFLAGS Oleksii Kurochko
                   ` (13 more replies)
  0 siblings, 14 replies; 54+ messages in thread
From: Oleksii Kurochko @ 2023-01-27 13:59 UTC (permalink / raw)
  To: xen-devel
  Cc: Jan Beulich, Julien Grall, Andrew Cooper, Stefano Stabellini,
	Gianluca Guida, Oleksii Kurochko, Bob Eshleman, Alistair Francis,
	Connor Davis, Doug Goldstein

The patch series is based on another one [Basic early_printk and smoke
test implementation] which hasn't been commited yet.

The patch series provides a basic implementation of exception handling.
It can do only basic things such as decode a cause of an exception,
save/restore registers and execute "wfi" instruction if an exception
can not be handled.

To verify that exception handling works well it was implemented macros
from <asm/bug.h> such as BUG/WARN/run_in_exception/assert_failed.
The implementation of macros is used "ebreak" instruction and set up bug
frame tables for each type of macros.
Also it was implemented register save/restore to return and continue work
after WARN/run_in_exception.
Not all functionality of the macros was implemented as some of them
require hard-panic the system which is not available now. Instead of
hard-panic 'wfi' instruction is used but it should be definitely changed
in the neareset future.
It wasn't implemented show_execution_state() and stack trace discovering
as it's not necessary now.

---
Changes in V2:
  - take the latest riscv_encoding.h from OpenSBI, update it with Xen
    related changes, and update the commit message with "Origin:"
    tag and the commit message itself.
  - add "Origin:" tag to the commit messag of the patch
    [xen/riscv: add <asm/csr.h> header].
  - Remove the patch [xen/riscv: add early_printk_hnum() function] as the
    functionality provided by the patch isn't used now.
  - Refactor prcoess.h: move structure offset defines to asm-offsets.c,
    change register_t to unsigned long.
  - Refactor entry.S to use offsets defined in asm-offsets.C
  - Rename {__,}handle_exception to handle_trap() and do_trap() to be more
    consistent with RISC-V spec.
  - Merge the pathc which introduces do_unexpected_trap() with the patch
    [xen/riscv: introduce exception handlers implementation].
  - Rename setup_trap_handler() to trap_init() and update correspondingly
    the patches in the patch series.
  - Refactor bug.h, remove bug_instr_t type from it.
  - Refactor decode_trap_cause() function to be more optimization-friendly.
  - Add two new empty headers: <cache.h> and <string.h> as they are needed to
    include <xen/lib.h> which provides ARRAY_SIZE and other macros.
  - Code style fixes.
---

Oleksii Kurochko (14):
  xen/riscv: add _zicsr to CFLAGS
  xen/riscv: add <asm/asm.h> header
  xen/riscv: add <asm/riscv_encoding.h header
  xen/riscv: add <asm/csr.h> header
  xen/riscv: introduce empty <asm/string.h>
  xen/riscv: introduce empty <asm/cache.h>
  xen/riscv: introduce exception context
  xen/riscv: introduce exception handlers implementation
  xen/riscv: introduce decode_cause() stuff
  xen/riscv: mask all interrupts
  xen/riscv: introduce trap_init()
  xen/riscv: introduce an implementation of macros from <asm/bug.h>
  xen/riscv: test basic handling stuff
  automation: add smoke test to verify macros from bug.h

 automation/scripts/qemu-smoke-riscv64.sh    |   2 +-
 xen/arch/riscv/Makefile                     |   2 +
 xen/arch/riscv/arch.mk                      |   2 +-
 xen/arch/riscv/entry.S                      |  94 ++
 xen/arch/riscv/include/asm/asm.h            |  54 ++
 xen/arch/riscv/include/asm/bug.h            | 118 +++
 xen/arch/riscv/include/asm/cache.h          |   6 +
 xen/arch/riscv/include/asm/csr.h            |  84 ++
 xen/arch/riscv/include/asm/processor.h      |  82 ++
 xen/arch/riscv/include/asm/riscv_encoding.h | 927 ++++++++++++++++++++
 xen/arch/riscv/include/asm/string.h         |   6 +
 xen/arch/riscv/include/asm/traps.h          |  14 +
 xen/arch/riscv/riscv64/asm-offsets.c        |  53 ++
 xen/arch/riscv/riscv64/head.S               |   5 +
 xen/arch/riscv/setup.c                      |  21 +
 xen/arch/riscv/traps.c                      | 231 +++++
 xen/arch/riscv/xen.lds.S                    |  10 +
 17 files changed, 1709 insertions(+), 2 deletions(-)
 create mode 100644 xen/arch/riscv/entry.S
 create mode 100644 xen/arch/riscv/include/asm/asm.h
 create mode 100644 xen/arch/riscv/include/asm/bug.h
 create mode 100644 xen/arch/riscv/include/asm/cache.h
 create mode 100644 xen/arch/riscv/include/asm/csr.h
 create mode 100644 xen/arch/riscv/include/asm/processor.h
 create mode 100644 xen/arch/riscv/include/asm/riscv_encoding.h
 create mode 100644 xen/arch/riscv/include/asm/string.h
 create mode 100644 xen/arch/riscv/include/asm/traps.h
 create mode 100644 xen/arch/riscv/traps.c

-- 
2.39.0



^ permalink raw reply	[flat|nested] 54+ messages in thread
end of thread, other threads:[~2023-02-06 17:13 UTC | newest]

Thread overview: 54+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-01-27 13:59 [PATCH v2 00/14] RISCV basic exception handling implementation Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 01/14] xen/riscv: add _zicsr to CFLAGS Oleksii Kurochko
2023-01-31  0:21   ` Alistair Francis
2023-01-31  9:14     ` Jan Beulich
2023-02-06 16:09       ` Oleksii
2023-01-27 13:59 ` [PATCH v2 02/14] xen/riscv: add <asm/asm.h> header Oleksii Kurochko
2023-01-31  0:49   ` Alistair Francis
2023-02-06 16:22   ` Oleksii
2023-01-27 13:59 ` [PATCH v2 03/14] xen/riscv: add <asm/riscv_encoding.h header Oleksii Kurochko
2023-01-30 13:29   ` Alistair Francis
2023-01-27 13:59 ` [PATCH v2 04/14] xen/riscv: add <asm/csr.h> header Oleksii Kurochko
2023-01-27 14:10   ` Jan Beulich
2023-01-30 11:37     ` Oleksii
2023-01-30 13:26   ` Alistair Francis
2023-01-27 13:59 ` [PATCH v2 05/14] xen/riscv: introduce empty <asm/string.h> Oleksii Kurochko
2023-01-31  0:49   ` Alistair Francis
2023-01-27 13:59 ` [PATCH v2 06/14] xen/riscv: introduce empty <asm/cache.h> Oleksii Kurochko
2023-01-31  0:50   ` Alistair Francis
2023-01-27 13:59 ` [PATCH v2 07/14] xen/riscv: introduce exception context Oleksii Kurochko
2023-01-27 14:24   ` Jan Beulich
2023-01-30 11:54     ` Oleksii
2023-01-30 13:50       ` Jan Beulich
2023-01-30 22:44         ` Julien Grall
2023-02-01  2:27           ` Andrew Cooper
2023-02-01  1:30         ` Stefano Stabellini
2023-02-06 17:13           ` Oleksii
2023-01-27 14:54   ` Julien Grall
2023-01-30 11:40     ` Oleksii
2023-01-30 22:11       ` Julien Grall
2023-01-31 12:24         ` Oleksii
2023-01-31 12:39           ` Julien Grall
2023-01-27 13:59 ` [PATCH v2 08/14] xen/riscv: introduce exception handlers implementation Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 09/14] xen/riscv: introduce decode_cause() stuff Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 10/14] xen/riscv: mask all interrupts Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 11/14] xen/riscv: introduce trap_init() Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 12/14] xen/riscv: introduce an implementation of macros from <asm/bug.h> Oleksii Kurochko
2023-01-27 14:34   ` Jan Beulich
2023-01-30 11:23     ` Oleksii
2023-01-27 14:38   ` Jan Beulich
2023-01-27 16:02   ` Julien Grall
2023-01-30 11:35     ` Oleksii
2023-01-30 11:49       ` Juergen Gross
2023-01-30 22:28       ` Julien Grall
2023-01-31 12:34         ` Oleksii
2023-02-01 17:40         ` Oleksii
2023-02-01 22:11           ` Julien Grall
2023-02-02 11:50             ` Jan Beulich
2023-02-03 13:15             ` Oleksii
2023-02-03 13:23               ` Julien Grall
2023-02-03 16:25                 ` Oleksii
2023-01-27 13:59 ` [PATCH v2 13/14] xen/riscv: test basic handling stuff Oleksii Kurochko
2023-01-27 13:59 ` [PATCH v2 14/14] automation: add smoke test to verify macros from bug.h Oleksii Kurochko
2023-01-27 14:43   ` Michal Orzel
2023-01-30 11:15     ` Oleksii

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