gdb, gdbserver, python, testsuite: Remove MPX.

GDB deprecated the commands "show/set mpx bound" in GDB 15.1, as Intel
listed Intel(R) Memory Protection Extensions (MPX) as removed in 2019.
MPX is also deprecated in gcc (since v9.1), the linux kernel (since v5.6)
and glibc (since v2.35).  Let's now remove MPX support in GDB completely.

This includes the removal of:
- MPX functionality including register support
- deprecated mpx commands
- i386 and amd64 implementation of the hooks report_signal_info and
  get_siginfo_type
- tests
- and pretty printer.

We keep MPX register numbers to not break compatibility with old gdbservers.

Approved-By: Felix Willgerodt <felix.willgerodt@intel.com>

1 files changed, 2 insertions, 22 deletions

diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index a85e0a9..82676c2 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -166,21 +166,6 @@ struct i386_gdbarch_tdep : gdbarch_tdep_base
   /* YMM16-31 register names.  Only used for tdesc_numbered_register.  */
   const char * const *ymm16h_register_names = nullptr;
 
-  /* Register number for %bnd0r.  Set this to -1 to indicate the absence
-     bound registers.  */
-  int bnd0r_regnum = 0;
-
-  /* Register number for pseudo register %bnd0.  Set this to -1 to indicate the absence
-     bound registers.  */
-  int bnd0_regnum = 0;
-
-  /* Register number for %bndcfgu. Set this to -1 to indicate the absence
-     bound control registers.  */
-  int bndcfgu_regnum = 0;
-
-  /* MPX register names.  Only used for tdesc_numbered_register.  */
-  const char * const *mpx_register_names = nullptr;
-
   /* Register number for %zmm0h.  Set this to -1 to indicate the absence
      of ZMM_HI256 register support.  */
   int zmm0h_regnum = 0;
@@ -246,7 +231,6 @@ struct i386_gdbarch_tdep : gdbarch_tdep_base
   struct type *i386_ymm_type = nullptr;
   struct type *i386_zmm_type = nullptr;
   struct type *i387_ext_type = nullptr;
-  struct type *i386_bnd_type = nullptr;
 
   /* Process record/replay target.  */
   /* The map for registers because the AMD64's registers order
@@ -298,6 +282,8 @@ enum i386_regnum
   I386_MXCSR_REGNUM = 40,	/* %mxcsr */
   I386_YMM0H_REGNUM,		/* %ymm0h */
   I386_YMM7H_REGNUM = I386_YMM0H_REGNUM + 7,
+  /* MPX is deprecated.  Yet we keep this to not give the registers below
+     a new number.  That could break older gdbservers.  */
   I386_BND0R_REGNUM,
   I386_BND3R_REGNUM = I386_BND0R_REGNUM + 3,
   I386_BNDCFGU_REGNUM,
@@ -346,7 +332,6 @@ enum record_i386_regnum
 
 #define I386_SSE_NUM_REGS	(I386_MXCSR_REGNUM + 1)
 #define I386_AVX_NUM_REGS	(I386_YMM7H_REGNUM + 1)
-#define I386_MPX_NUM_REGS	(I386_BNDSTATUS_REGNUM + 1)
 #define I386_AVX512_NUM_REGS	(I386_ZMM7H_REGNUM + 1)
 #define I386_PKEYS_NUM_REGS	(I386_PKRU_REGNUM + 1)
 #define I386_NUM_REGS		(I386_GSBASE_REGNUM + 1)
@@ -365,7 +350,6 @@ extern int i386_xmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 extern int i386_xmm_avx512_regnum_p (struct gdbarch * gdbarch, int regnum);
 extern int i386_ymm_regnum_p (struct gdbarch *gdbarch, int regnum);
 extern int i386_ymm_avx512_regnum_p (struct gdbarch *gdbarch, int regnum);
-extern int i386_bnd_regnum_p (struct gdbarch *gdbarch, int regnum);
 extern int i386_k_regnum_p (struct gdbarch *gdbarch, int regnum);
 extern int i386_zmm_regnum_p (struct gdbarch *gdbarch, int regnum);
 extern int i386_zmmh_regnum_p (struct gdbarch *gdbarch, int regnum);
@@ -468,10 +452,6 @@ extern int i386_process_record (struct gdbarch *gdbarch,
 extern const struct target_desc *i386_target_description (uint64_t xcr0,
 							  bool segments);
 
-/* Return true iff the current target is MPX enabled.  */
-extern int i386_mpx_enabled (void);
-
-
 /* Functions and variables exported from i386-bsd-tdep.c.  */
 
 extern void i386bsd_init_abi (struct gdbarch_info, struct gdbarch *);