gdb/

	* NEWS: Add microMIPS support and "set mips compression",
	"show mips compression" commands.
	* mips-tdep.h (mips_isa): New enum.
	(gdbarch_tdep): Add mips_isa.
	(mips_pc_is_mips16): Update prototype.
	(mips_pc_is_mips, mips_pc_is_micromips): New prototypes.
	* mips-tdep.c (mips_compression_mips16): New variable.
	(mips_compression_micromips): Likewise.
	(mips_compression_strings): Likewise.
	(mips_compression_string): Likewise.
	(is_mips16_isa, is_micromips_isa): New functions.
	(is_mips16_addr): Rename to...
	(is_compact_addr): ... this.
	(unmake_mips16_addr): Likewise to...
	(unmake_compact_addr): ... this.
	(make_mips16_addr): Likewise to...
	(make_compact_addr): ... this.
	(is_mips_addr, is_mips16_addr, is_micromips_addr): New
	functions.
	(mips_elf_make_msymbol_special): Handle microMIPS code.
	(msymbol_is_special): Rename to...
	(msymbol_is_mips16): ... this.
	(mips_make_symbol_special, mips_pc_is_mips16): Update
	accordingly.
	(msymbol_is_mips, msymbol_is_micromips): New functions.
	(mips16_to_32_reg): Rename to...
	(mips_reg3_to_reg): ... this.
	(mips_pc_is_mips, mips_pc_is_micromips): New functions.
	(mips_pc_isa): Likewise.
	(mips_read_pc, mips_unwind_pc, mips_write_pc): Handle microMIPS
	code.
	(mips_fetch_instruction): Pass return status instead of printing
	an error message if requested.  Handle microMIPS code.  Bail out
	on an invalid ISA.
	(micromips_op): New macro.
	(b0s4_imm, b0s5_imm, b0s5_reg, b0s7_imm, b0s10_imm): Likewise.
	(b1s9_imm, b2s3_cc, b4s2_regl, b5s5_op, b5s5_reg): Likewise.
	(b6s4_op, b7s3_reg): Likewise.
	(b0s6_op, b0s11_op, b0s12_imm, b0s16_imm, b0s26_imm): Likewise.
	(b6s10_ext, b11s5_reg, b12s4_op): Likewise.
	(mips_insn_size): New function.
	(mips32_next_pc): Update mips_fetch_instruction call.
	(micromips_relative_offset7): New function.
	(micromips_relative_offset10): Likewise.
	(micromips_relative_offset16): Likewise.
	(micromips_pc_insn_size): Likewise.
	(micromips_bc1_pc): Likewise.
	(micromips_next_pc): Likewise.
	(unpack_mips16): Update mips_fetch_instruction call.
	(extended_mips16_next_pc): Update according to change to
	mips16_to_32_reg.
	(mips_next_pc): Update mips_pc_is_mips16 call.  Handle microMIPS
	code.
	(mips16_scan_prologue): Update mips_fetch_instruction call.
	Update according to change to mips16_to_32_reg.
	(mips_insn16_frame_sniffer): Update mips_pc_is_mips16 call.
	(mips_insn16_frame_base_sniffer): Likewise.
	(micromips_decode_imm9): New function.
	(micromips_scan_prologue): Likewise.
	(mips_micro_frame_cache): Likewise.
	(mips_micro_frame_this_id): Likewise.
	(mips_micro_frame_prev_register): Likewise.
	(mips_micro_frame_sniffer): Likewise.
	(mips_micro_frame_unwind): New variable.
	(mips_micro_frame_base_address): New function.
	(mips_micro_frame_base): New variable.
	(mips_micro_frame_base_sniffer): New function.
	(mips32_scan_prologue): Update mips_fetch_instruction call.
	(mips_insn32_frame_sniffer): Check for the standard MIPS ISA
	rather than for MIPS16.
	(mips_insn32_frame_base_sniffer): Likewise.
	(mips_addr_bits_remove): Handle microMIPS code.
	(deal_with_atomic_sequence): Rename to...
	(mips_deal_with_atomic_sequence): ... this.  Update the type
	of the variable used to hold an instruction.  Remove the ISA bit
	check.  Update mips_fetch_instruction call.
	(micromips_deal_with_atomic_sequence): New function.
	(deal_with_atomic_sequence): Likewise.
	(mips_about_to_return): Handle microMIPS code.  Update
	mips_fetch_instruction call.
	(heuristic_proc_start): Check for the standard MIPS ISA rather
	than for MIPS16.  Update mips_pc_is_mips16 and
	mips_fetch_instruction calls.  Handle microMIPS code.
	(mips_push_dummy_code): Handle microMIPS code.
	(mips_eabi_push_dummy_call): Likewise.
	(mips_o32_return_value): Update mips_pc_is_mips16 call.
	(mips_o64_push_dummy_call): Handle microMIPS code.
	(mips_o64_return_value): Update mips_pc_is_mips16 call.
	(is_delayed): Remove function.
	(mips_single_step_through_delay): Replace the call to is_delayed
	with mips32_instruction_has_delay_slot.  Correct MIPS16 handling.
	Handle microMIPS code.
	(mips_skip_prologue): Update mips_pc_is_mips16 call.  Handle
	microMIPS code.
	(mips32_in_function_epilogue_p): Update mips_fetch_instruction
	call.
	(micromips_in_function_epilogue_p): New function.
	(mips16_in_function_epilogue_p): Update mips_fetch_instruction
	call.
	(mips_in_function_epilogue_p): Update mips_pc_is_mips16 call.
	Handle microMIPS.
	(gdb_print_insn_mips): Likewise.
	(mips_breakpoint_from_pc): Likewise.
	(mips_remote_breakpoint_from_pc): New function.
	(mips32_instruction_has_delay_slot): Simplify making use of the
	updated mips_fetch_instruction interface.
	(micromips_instruction_has_delay_slot): New function.
	(mips16_instruction_has_delay_slot): Simplify making use of the
	updated mips_fetch_instruction interface.
	(mips_adjust_breakpoint_address): Check for the standard MIPS
	ISA rather than for MIPS16 ISA.  Update for unmake_compact_addr
	calls.  Handle microMIPS code.
	(mips_get_mips16_fn_stub_pc): Update mips_fetch_instruction call.
	(mips_skip_trampoline_code): Handle microMIPS code.
	(global_mips_compression): New function.
	(mips_gdbarch_init): Handle the compressed ISA setting from ELF
	file flags.  Register the microMIPS remote breakpoint handler
	and heuristic frame unwinder.
	(show_mips_compression): New function.
	(_initialize_mips_tdep): Add the "set mips compression" and
	"show mips compression" commands.

	gdb/doc/
	* gdb.texinfo (MIPS): Document "set mips compression" and "show
	mips compression".
	(MIPS Breakpoint Kinds): New subsubsection.

1 files changed, 10 insertions, 0 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index e39ccd35b4e..d85fe0d88b9 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -3,6 +3,8 @@
 
 *** Changes since GDB 7.4
 
+* GDB now supports debugging microMIPS binaries.
+
 * The "info os" command on GNU/Linux can now display information on
   several new classes of objects managed by the operating system:
     "info os procgroups" lists process groups
@@ -166,6 +168,14 @@ HP OpenVMS ia64			ia64-hp-openvms*
 
 * New options
 
+set mips compression
+show mips compression
+  Select the compressed ISA encoding used in functions that have no symbol
+  information available.  The encoding can be set to either of:
+    mips16
+    micromips
+  and is updated automatically from ELF file flags if available.
+
 set breakpoint condition-evaluation
 show breakpoint condition-evaluation
   Control whether breakpoint conditions are evaluated by GDB ("host") or by