Nios II R2 support for GDB.
authorSandra Loosemore <sandra@codesourcery.com>
Mon, 3 Aug 2015 18:39:52 +0000 (11:39 -0700)
committerSandra Loosemore <sandra@codesourcery.com>
Mon, 3 Aug 2015 18:39:52 +0000 (11:39 -0700)
commitaf60a1ef46d2c4aca22868b0f2819234b949018e
treef10910f0faea7fcb62be21c72260f520a82712c5
parentcb1c8103f13d413e05ca6e61e21b56bba3baae74
Nios II R2 support for GDB.

2015-08-03  Sandra Loosemore  <sandra@codesourcery.com>

gdb/
* nios2-tdep.h: Include opcode/nios2.h here.
(NIOS2_CDX_OPCODE_SIZE): New.
(struct gdbarch_tdep): Add OP parameter to syscall_next_pc.
* nios2-tdep.c: Don't include opcode/nios2.h here.
(nios2_fetch_insn): For R2, try reading 2-byte instruction if
4-byte read fails.
(nios2_match_add, nios2_match_sub): Add cases for R2 encodings.
(nios2_match_addi, nios2_match_orhi): Likewise.
(nios2_match_stw, nios2_match_ldw): Likewise.
(nios2_match_rdctl): Likewise.
(nios2_match_stwm, nios2_match_ldwm): New.
(nios2_match_branch): Add cases for R2 encodings.
(nios2_match_jmpi, nios2_match_calli): Likewise.
(nios2_match_jmpr, nios2_match_callr): Likewise.
(nios2_match_break, nios2_match_trap): Likewise.
(nios2_in_epilogue_p): Add R2 support.
(nios2_analyze_prologue): Update comments.  Recognize R2 CDX
prologues.
(nios2_breakpoint_from_pc): Handle R2 instructions.
(nios2_get_next_pc): Likewise.  Adjust call to
tdep->syscall_next_pc.
* nios2-linux-tdep.c (nios2_r1_linux_rt_sigreturn_tramp_frame):
Renamed from nios2_linux_rt_sigreturn_tramp_frame.  Use
instruction field macros instead of literal hex values.
(nios2_r2_linux_rt_sigreturn_tramp_frame): New.
(nios2_linux_syscall_next_pc): Adjust signature to pass OP.
Use size field from OP instead of assuming all instructions
are the same size.
(nios2_linux_init_abi): Register appropriate unwinder for mach.

gdb/gdbserver/
* linux-nios2-low.c (NIOS2_BREAKPOINT): Conditionalize for
arch variant.
(CDX_BREAKPOINT): Define for R2.
(nios2_breakpoint_at): Check for CDX_BREAKPOINT when R2.
(the_low_target): Add comments.
gdb/ChangeLog
gdb/gdbserver/ChangeLog
gdb/gdbserver/linux-nios2-low.c
gdb/nios2-linux-tdep.c
gdb/nios2-tdep.c
gdb/nios2-tdep.h