[Qemu-devel] [RFC 0/9] target-xtensa: implement debug option

[Max Filippov]

This patch series implements Xtensa debug option: debug interrupt, breakpoint
opcodes, instruction breakpoint SRs, instruction counting SR, data breakpoint
SRs.

This option enables native debugging, e.g. now guest linux GDB is functional.

Three exec.c patches fixe watchpoints bits that nobody seems to use currently.

There are still unresolved issue with data breakpoints on unmapped memory:
Xtensa ISA says that data breakpoint exception has higher priority than
TLB exception and thus accessing unmapped address that hits data breakpoint
will raise debug exception. Watchpoint mapping is performed in the tlb_set_page,
but it is not called in case of guest TLB miss. Any idea on how to resolve it
is welcome.

Max Filippov (9):
  target-xtensa: add DEBUGCAUSE SR and configuration
  target-xtensa: implement instruction breakpoints
  target-xtensa: add ICOUNT SR and debug exception
  exec: add missing breaks to the watch_mem_write
  exec: fix check_watchpoint exiting cpu_loop
  exec: let cpu_watchpoint_insert accept larger watchpoints
  target-xtensa: add DBREAK data breakpoints
  target-xtensa: add DEBUG_SECTION to overlay tool
  target-xtensa: add breakpoint tests

 exec.c                        |   18 +++-
 target-xtensa/core-dc232b.c   |    1 +
 target-xtensa/core-fsf.c      |    1 +
 target-xtensa/cpu.h           |   42 ++++++++
 target-xtensa/helper.c        |   43 ++++++++
 target-xtensa/helpers.h       |    7 ++
 target-xtensa/op_helper.c     |  100 ++++++++++++++++++
 target-xtensa/overlay_tool.h  |    5 +
 target-xtensa/translate.c     |  153 +++++++++++++++++++++++++++-
 tests/tcg/xtensa/Makefile     |    1 +
 tests/tcg/xtensa/test_break.S |  223 +++++++++++++++++++++++++++++++++++++++++
 11 files changed, 585 insertions(+), 9 deletions(-)
 create mode 100644 tests/tcg/xtensa/test_break.S

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1.7.7.6