gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gdb / arm-nbsd-tdep.c

diff --git a/gdb/arm-nbsd-tdep.c b/gdb/arm-nbsd-tdep.c
index 36e0605cdb9e90189a474df447ace8975e929c3b..b1e369d41c2e92d18c6dcb9e7f4607bf7f48af87 100644 (file)
--- a/gdb/arm-nbsd-tdep.c
+++ b/gdb/arm-nbsd-tdep.c
@@ -1,6 +1,6 @@
 /* Target-dependent code for NetBSD/arm.
 
-   Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   Copyright (C) 2002-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -21,20 +21,92 @@
 #include "osabi.h"
 
 #include "arch/arm.h"
+#include "arm-nbsd-tdep.h"
+#include "nbsd-tdep.h"
 #include "arm-tdep.h"
+#include "regset.h"
 #include "solib-svr4.h"
 
 /* Description of the longjmp buffer.  */
 #define ARM_NBSD_JB_PC 24
-#define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
+#define ARM_NBSD_JB_ELEMENT_SIZE ARM_INT_REGISTER_SIZE
 
-/* For compatibility with previous implemenations of GDB on arm/NetBSD,
+/* For compatibility with previous implementations of GDB on arm/NetBSD,
    override the default little-endian breakpoint.  */
 static const gdb_byte arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
 static const gdb_byte arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
 static const gdb_byte arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
 static const gdb_byte arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
 
+/* This matches struct reg from NetBSD's sys/arch/arm/include/reg.h:
+   https://github.com/NetBSD/src/blob/7c13e6e6773bb171f4ed3ed53013e9d24b3c1eac/sys/arch/arm/include/reg.h#L39
+ */
+struct arm_nbsd_reg
+{
+  uint32_t reg[13];
+  uint32_t sp;
+  uint32_t lr;
+  uint32_t pc;
+  uint32_t cpsr;
+};
+
+void
+arm_nbsd_supply_gregset (const struct regset *regset, struct regcache *regcache,
+                        int regnum, const void *gregs, size_t len)
+{
+  const arm_nbsd_reg *gregset = static_cast<const arm_nbsd_reg *>(gregs);
+  gdb_assert (len >= sizeof (arm_nbsd_reg));
+
+  /* Integer registers.  */
+  for (int i = ARM_A1_REGNUM; i < ARM_SP_REGNUM; i++)
+    if (regnum == -1 || regnum == i)
+      regcache->raw_supply (i, (char *) &gregset->reg[i]);
+
+  if (regnum == -1 || regnum == ARM_SP_REGNUM)
+    regcache->raw_supply (ARM_SP_REGNUM, (char *) &gregset->sp);
+
+  if (regnum == -1 || regnum == ARM_LR_REGNUM)
+    regcache->raw_supply (ARM_LR_REGNUM, (char *) &gregset->lr);
+
+  if (regnum == -1 || regnum == ARM_PC_REGNUM)
+    {
+      CORE_ADDR r_pc = gdbarch_addr_bits_remove (regcache->arch (), gregset->pc);
+      regcache->raw_supply (ARM_PC_REGNUM, (char *) &r_pc);
+    }
+
+  if (regnum == -1 || regnum == ARM_PS_REGNUM)
+    {
+      if (arm_apcs_32)
+       regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->cpsr);
+      else
+       regcache->raw_supply (ARM_PS_REGNUM, (char *) &gregset->pc);
+    }
+}
+
+static const struct regset arm_nbsd_regset = {
+  nullptr,
+  arm_nbsd_supply_gregset,
+  /* We don't need a collect function because we only use this reading registers
+     (via iterate_over_regset_sections and fetch_regs/fetch_register).  */
+  nullptr,
+  0
+};
+
+static void
+arm_nbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
+                                      iterate_over_regset_sections_cb *cb,
+                                      void *cb_data,
+                                      const struct regcache *regcache)
+{
+  cb (".reg", sizeof (arm_nbsd_reg), sizeof (arm_nbsd_reg), &arm_nbsd_regset,
+      NULL, cb_data);
+  /* cbiesinger/2020-02-12 -- as far as I can tell, ARM/NetBSD does
+     not write any floating point registers into the core file (tested
+     with NetBSD 9.1_RC1).  When it does, this function will need to read them,
+     and the arm-netbsd gdbarch will need a core_read_description function
+     to return the right description for them.  */
+}
+
 static void
 arm_netbsd_init_abi_common (struct gdbarch_info info,
                            struct gdbarch *gdbarch)
@@ -66,10 +138,12 @@ arm_netbsd_init_abi_common (struct gdbarch_info info,
   tdep->jb_pc = ARM_NBSD_JB_PC;
   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
 
+  set_gdbarch_iterate_over_regset_sections
+    (gdbarch, arm_nbsd_iterate_over_regset_sections);
   /* Single stepping.  */
   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
 }
-  
+
 static void
 arm_netbsd_elf_init_abi (struct gdbarch_info info,
                         struct gdbarch *gdbarch)
@@ -77,6 +151,9 @@ arm_netbsd_elf_init_abi (struct gdbarch_info info,
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
   arm_netbsd_init_abi_common (info, gdbarch);
+
+  nbsd_init_abi (info, gdbarch);
+
   if (tdep->fp_model == ARM_FLOAT_AUTO)
     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
 
@@ -85,8 +162,9 @@ arm_netbsd_elf_init_abi (struct gdbarch_info info,
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 }
 
+void _initialize_arm_netbsd_tdep ();
 void
-_initialize_arm_netbsd_tdep (void)
+_initialize_arm_netbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD,
                           arm_netbsd_elf_init_abi);