Multi-target support

[deliverable/binutils-gdb.git] / gdb / i386-linux-nat.c

diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index d1d32e1b20fa6fb775acb2496d8c6d51469ccabd..32cd879de80b9bb87050fb6599f3822d179e3909 100644 (file)
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -1,6 +1,6 @@
 /* Native-dependent code for GNU/Linux i386.
 
-   Copyright (C) 1999-2018 Free Software Foundation, Inc.
+   Copyright (C) 1999-2020 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -31,13 +31,24 @@
 #include "i387-tdep.h"
 #include "i386-tdep.h"
 #include "i386-linux-tdep.h"
-#include "x86-xstate.h"
+#include "gdbsupport/x86-xstate.h"
 
-#include "linux-nat.h"
 #include "x86-linux-nat.h"
 #include "nat/linux-ptrace.h"
 #include "inf-ptrace.h"
 
+struct i386_linux_nat_target final : public x86_linux_nat_target
+{
+  /* Add our register access methods.  */
+  void fetch_registers (struct regcache *, int) override;
+  void store_registers (struct regcache *, int) override;
+
+  /* Override the default ptrace resume method.  */
+  void low_resume (ptid_t ptid, int step, enum gdb_signal sig) override;
+};
+
+static i386_linux_nat_target the_i386_linux_nat_target;
+
 /* The register sets used in GNU/Linux ELF core-dumps are identical to
    the register sets in `struct user' that is used for a.out
    core-dumps, and is also used by `ptrace'.  The corresponding types
@@ -101,11 +112,11 @@ fetch_register (struct regcache *regcache, int regno)
   gdb_assert (!have_ptrace_getregs);
   if (i386_linux_gregset_reg_offset[regno] == -1)
     {
-      regcache_raw_supply (regcache, regno, NULL);
+      regcache->raw_supply (regno, NULL);
       return;
     }
 
-  tid = get_ptrace_pid (regcache_get_ptid (regcache));
+  tid = get_ptrace_pid (regcache->ptid ());
 
   errno = 0;
   val = ptrace (PTRACE_PEEKUSER, tid,
@@ -115,7 +126,7 @@ fetch_register (struct regcache *regcache, int regno)
           gdbarch_register_name (regcache->arch (), regno),
           regno, safe_strerror (errno));
 
-  regcache_raw_supply (regcache, regno, &val);
+  regcache->raw_supply (regno, &val);
 }
 
 /* Store one register.  */
@@ -130,10 +141,10 @@ store_register (const struct regcache *regcache, int regno)
   if (i386_linux_gregset_reg_offset[regno] == -1)
     return;
 
-  tid = get_ptrace_pid (regcache_get_ptid (regcache));
+  tid = get_ptrace_pid (regcache->ptid ());
 
   errno = 0;
-  regcache_raw_collect (regcache, regno, &val);
+  regcache->raw_collect (regno, &val);
   ptrace (PTRACE_POKEUSER, tid,
          i386_linux_gregset_reg_offset[regno], val);
   if (errno != 0)
@@ -156,13 +167,13 @@ supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
   int i;
 
   for (i = 0; i < I386_NUM_GREGS; i++)
-    regcache_raw_supply (regcache, i,
-                        regp + i386_linux_gregset_reg_offset[i]);
+    regcache->raw_supply (i, regp + i386_linux_gregset_reg_offset[i]);
 
   if (I386_LINUX_ORIG_EAX_REGNUM
        < gdbarch_num_regs (regcache->arch ()))
-    regcache_raw_supply (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp
-                        + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
+    regcache->raw_supply
+      (I386_LINUX_ORIG_EAX_REGNUM,
+       regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
 }
 
 /* Fill register REGNO (if it is a general-purpose register) in
@@ -178,14 +189,14 @@ fill_gregset (const struct regcache *regcache,
 
   for (i = 0; i < I386_NUM_GREGS; i++)
     if (regno == -1 || regno == i)
-      regcache_raw_collect (regcache, i,
-                           regp + i386_linux_gregset_reg_offset[i]);
+      regcache->raw_collect (i, regp + i386_linux_gregset_reg_offset[i]);
 
   if ((regno == -1 || regno == I386_LINUX_ORIG_EAX_REGNUM)
       && I386_LINUX_ORIG_EAX_REGNUM
           < gdbarch_num_regs (regcache->arch ()))
-    regcache_raw_collect (regcache, I386_LINUX_ORIG_EAX_REGNUM, regp
-                         + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
+    regcache->raw_collect
+      (I386_LINUX_ORIG_EAX_REGNUM,
+       regp + i386_linux_gregset_reg_offset[I386_LINUX_ORIG_EAX_REGNUM]);
 }
 
 #ifdef HAVE_PTRACE_GETREGS
@@ -446,9 +457,8 @@ store_fpxregs (const struct regcache *regcache, int tid, int regno)
    this for all registers (including the floating point and SSE
    registers).  */
 
-static void
-i386_linux_fetch_inferior_registers (struct target_ops *ops,
-                                    struct regcache *regcache, int regno)
+void
+i386_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
 {
   pid_t tid;
 
@@ -465,7 +475,7 @@ i386_linux_fetch_inferior_registers (struct target_ops *ops,
       return;
     }
 
-  tid = get_ptrace_pid (regcache_get_ptid (regcache));
+  tid = get_ptrace_pid (regcache->ptid ());
 
   /* Use the PTRACE_GETFPXREGS request whenever possible, since it
      transfers more registers in one system call, and we'll cache the
@@ -478,7 +488,7 @@ i386_linux_fetch_inferior_registers (struct target_ops *ops,
       /* The call above might reset `have_ptrace_getregs'.  */
       if (!have_ptrace_getregs)
        {
-         i386_linux_fetch_inferior_registers (ops, regcache, regno);
+         fetch_registers (regcache, regno);
          return;
        }
 
@@ -524,9 +534,8 @@ i386_linux_fetch_inferior_registers (struct target_ops *ops,
 /* Store register REGNO back into the child process.  If REGNO is -1,
    do this for all registers (including the floating point and SSE
    registers).  */
-static void
-i386_linux_store_inferior_registers (struct target_ops *ops,
-                                    struct regcache *regcache, int regno)
+void
+i386_linux_nat_target::store_registers (struct regcache *regcache, int regno)
 {
   pid_t tid;
 
@@ -543,7 +552,7 @@ i386_linux_store_inferior_registers (struct target_ops *ops,
       return;
     }
 
-  tid = get_ptrace_pid (regcache_get_ptid (regcache));
+  tid = get_ptrace_pid (regcache->ptid ());
 
   /* Use the PTRACE_SETFPXREGS requests whenever possible, since it
      transfers more registers in one system call.  But remember that
@@ -635,11 +644,10 @@ static const unsigned char linux_syscall[] = { 0xcd, 0x80 };
    If STEP is nonzero, single-step it.
    If SIGNAL is nonzero, give it that signal.  */
 
-static void
-i386_linux_resume (struct target_ops *ops,
-                  ptid_t ptid, int step, enum gdb_signal signal)
+void
+i386_linux_nat_target::low_resume (ptid_t ptid, int step, enum gdb_signal signal)
 {
-  int pid = ptid_get_lwp (ptid);
+  int pid = ptid.lwp ();
   int request;
 
   if (catch_syscall_enabled () > 0)
@@ -649,7 +657,7 @@ i386_linux_resume (struct target_ops *ops,
 
   if (step)
     {
-      struct regcache *regcache = get_thread_regcache (ptid);
+      struct regcache *regcache = get_thread_regcache (this, ptid);
       struct gdbarch *gdbarch = regcache->arch ();
       enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
       ULONGEST pc;
@@ -706,16 +714,8 @@ i386_linux_resume (struct target_ops *ops,
 void
 _initialize_i386_linux_nat (void)
 {
-  /* Create a generic x86 GNU/Linux target.  */
-  struct target_ops *t = x86_linux_create_target ();
-
-  /* Override the default ptrace resume method.  */
-  t->to_resume = i386_linux_resume;
-
-  /* Add our register access methods.  */
-  t->to_fetch_registers = i386_linux_fetch_inferior_registers;
-  t->to_store_registers = i386_linux_store_inferior_registers;
+  linux_target = &the_i386_linux_nat_target;
 
   /* Add the target.  */
-  x86_linux_add_target (t);
+  add_inf_child_target (linux_target);
 }