[thirdparty/binutils-gdb.git] / gdb / mips-irix-tdep.c

/* Target-dependent code for the MIPS architecture running on IRIX,
   for GDB, the GNU Debugger.

   Copyright (C) 2002-2014 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "osabi.h"
#include <string.h>
#include "solib.h"
#include "solib-irix.h"
#include "elf-bfd.h"
#include "mips-tdep.h"
#include "trad-frame.h"
#include "tramp-frame.h"

static void
mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
                                            void *obj)
{
  enum gdb_osabi *os_ident_ptr = obj;
  const char *name;
  unsigned int sectsize;

  name = bfd_get_section_name (abfd, sect);
  sectsize = bfd_section_size (abfd, sect);

  if (strncmp (name, ".MIPS.", 6) == 0 && sectsize > 0)
    {
      /* The presence of a section named with a ".MIPS." prefix is
         indicative of an IRIX binary.  */
      *os_ident_ptr = GDB_OSABI_IRIX;
    }
}

static enum gdb_osabi
mips_irix_elf_osabi_sniffer (bfd *abfd)
{
  unsigned int elfosabi;
  enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;

  /* If the generic sniffer gets a hit, return and let other sniffers
     get a crack at it.  */
  bfd_map_over_sections (abfd,
			 generic_elf_osabi_sniff_abi_tag_sections,
			 &osabi);
  if (osabi != GDB_OSABI_UNKNOWN)
    return GDB_OSABI_UNKNOWN;

  elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];

  if (elfosabi == ELFOSABI_NONE)
    {
      /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
	 file are conforming to the base specification for that machine 
	 (there are no OS-specific extensions).  In order to determine the 
	 real OS in use we must look for OS notes that have been added.
	 
	 For IRIX, we simply look for sections named with .MIPS. as
	 prefixes.  */
      bfd_map_over_sections (abfd,
			     mips_irix_elf_osabi_sniff_abi_tag_sections, 
			     &osabi);
    }
  return osabi;
}

/* Unwinding past the signal handler on mips-irix.

   Note: The following has only been tested with N32, but can probably
         be made to work with a small number of adjustments.

   On mips-irix, the sigcontext_t structure is stored at the base
   of the frame established by the _sigtramp function.  The definition
   of this structure can be found in <sys/signal.h> (comments have been
   C++'ified to avoid a collision with the C-style comment delimiters
   used by this comment):

      typedef struct sigcontext {
        __uint32_t      sc_regmask;     // regs to restore in sigcleanup
        __uint32_t      sc_status;      // cp0 status register
        __uint64_t      sc_pc;          // pc at time of signal
        // General purpose registers
        __uint64_t      sc_regs[32];    // processor regs 0 to 31
        // Floating point coprocessor state
        __uint64_t      sc_fpregs[32];  // fp regs 0 to 31
        __uint32_t      sc_ownedfp;     // fp has been used
        __uint32_t      sc_fpc_csr;     // fpu control and status reg
        __uint32_t      sc_fpc_eir;     // fpu exception instruction reg
                                        // implementation/revision
        __uint32_t      sc_ssflags;     // signal stack state to restore
        __uint64_t      sc_mdhi;        // Multiplier hi and low regs
        __uint64_t      sc_mdlo;
        // System coprocessor registers at time of signal
        __uint64_t      sc_cause;       // cp0 cause register
        __uint64_t      sc_badvaddr;    // cp0 bad virtual address
        __uint64_t      sc_triggersave; // state of graphics trigger (SGI)
        sigset_t        sc_sigset;      // signal mask to restore
        __uint64_t      sc_fp_rounded_result;   // for Ieee 754 support
        __uint64_t      sc_pad[31];
      } sigcontext_t;

   The following macros provide the offset of some of the fields
   used to retrieve the value of the registers before the signal
   was raised.  */

/* The size of the sigtramp frame.  The sigtramp frame base can then
   be computed by adding this size to the SP.  */
#define SIGTRAMP_FRAME_SIZE 48
/* The offset in sigcontext_t where the PC is saved.  */
#define SIGCONTEXT_PC_OFF 8
/* The offset in sigcontext_t where the GP registers are saved.  */
#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
/* The offset in sigcontext_t where the FP regsiters are saved.  */
#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
/* The offset in sigcontext_t where the FP CSR register is saved.  */
#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
/* The offset in sigcontext_t where the multiplier hi register is saved.  */
#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
/* The offset in sigcontext_t where the multiplier lo register is saved.  */
#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)

/* Implement the "init" routine in struct tramp_frame for the N32 ABI
   on mips-irix.  */
static void
mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
				struct frame_info *this_frame,
				struct trad_frame_cache *this_cache,
				CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  const int num_regs = gdbarch_num_regs (gdbarch);
  int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
  const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
  const CORE_ADDR sigcontext_base = sp + 48;
  const struct mips_regnum *regs = mips_regnum (gdbarch);
  int ireg;

  trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
                           sigcontext_base + SIGCONTEXT_PC_OFF);

  for (ireg = 1; ireg < 32; ireg++)
    trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
                             sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);

  for (ireg = 0; ireg < 32; ireg++)
    trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
                             sigcontext_base + SIGCONTEXT_FPREGS_OFF
                               + ireg * 8);

  trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
                           sigcontext_base + SIGCONTEXT_FPCSR_OFF);

  trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
                           sigcontext_base + SIGCONTEXT_HI_OFF);

  trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
                           sigcontext_base + SIGCONTEXT_LO_OFF);

  trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
}

/* The tramp_frame structure describing sigtramp frames on mips-irix N32.

   Note that the list of instructions below is pretty much a pure dump
   of function _sigtramp on mips-irix.  A few instructions are actually
   not tested (mask set to 0), because a portion of these instructions
   contain an address which changes due to relocation.  We could use
   a smarter mask that checks the instrutction code alone, but given
   the number of instructions already being checked, this seemed
   unnecessary.  */

static const struct tramp_frame mips_irix_n32_tramp_frame =
{
  SIGTRAMP_FRAME,
  4,
  {
   { 0x3c0c8000, -1 }, /*    lui     t0,0x8000 */
   { 0x27bdffd0, -1 }, /*    addiu   sp,sp,-48 */
   { 0x008c6024, -1 }, /*    and     t0,a0,t0 */
   { 0xffa40018, -1 }, /*    sd      a0,24(sp) */
   { 0x00000000,  0 }, /*    beqz    t0,0xfaefcb8 <_sigtramp+40> */
   { 0xffa60028, -1 }, /*    sd      a2,40(sp) */
   { 0x01806027, -1 }, /*    nor     t0,t0,zero */
   { 0xffa00020, -1 }, /*    sd      zero,32(sp) */
   { 0x00000000,  0 }, /*    b       0xfaefcbc <_sigtramp+44> */
   { 0x008c2024, -1 }, /*    and     a0,a0,t0 */
   { 0xffa60020, -1 }, /*    sd      a2,32(sp) */
   { 0x03e0c025, -1 }, /*    move    t8,ra */
   { 0x00000000,  0 }, /*    bal     0xfaefcc8 <_sigtramp+56> */
   { 0x00000000, -1 }, /*    nop */
   { 0x3c0c0007, -1 }, /*    lui     t0,0x7 */
   { 0x00e0c825, -1 }, /*    move    t9,a3 */
   { 0x658c80fc, -1 }, /*    daddiu  t0,t0,-32516 */
   { 0x019f602d, -1 }, /*    daddu   t0,t0,ra */
   { 0x0300f825, -1 }, /*    move    ra,t8 */
   { 0x8d8c9880, -1 }, /*    lw      t0,-26496(t0) */
   { 0x8d8c0000, -1 }, /*    lw      t0,0(t0) */
   { 0x8d8d0000, -1 }, /*    lw      t1,0(t0) */
   { 0xffac0008, -1 }, /*    sd      t0,8(sp) */
   { 0x0320f809, -1 }, /*    jalr    t9 */
   { 0xffad0010, -1 }, /*    sd      t1,16(sp) */
   { 0xdfad0010, -1 }, /*    ld      t1,16(sp) */
   { 0xdfac0008, -1 }, /*    ld      t0,8(sp) */
   { 0xad8d0000, -1 }, /*    sw      t1,0(t0) */
   { 0xdfa40020, -1 }, /*    ld      a0,32(sp) */
   { 0xdfa50028, -1 }, /*    ld      a1,40(sp) */
   { 0xdfa60018, -1 }, /*    ld      a2,24(sp) */
   { 0x24020440, -1 }, /*    li      v0,1088 */
   { 0x0000000c, -1 }, /*    syscall */
   { TRAMP_SENTINEL_INSN, -1 }
  },
  mips_irix_n32_tramp_frame_init
};

/* Implement the "init" routine in struct tramp_frame for the stack-based
   trampolines used on mips-irix.  */

static void
mips_irix_n32_stack_tramp_frame_init (const struct tramp_frame *self,
				      struct frame_info *this_frame,
				      struct trad_frame_cache *this_cache,
				      CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  const int num_regs = gdbarch_num_regs (gdbarch);
  int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
  const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);

  /* The previous frame's PC is stored in RA.  */
  trad_frame_set_reg_realreg (this_cache, gdbarch_pc_regnum (gdbarch),
                              num_regs + MIPS_RA_REGNUM);

  trad_frame_set_id (this_cache, frame_id_build (sp, func));
}

/* A tramp_frame structure describing the stack-based trampoline
   used on mips-irix.  These trampolines are created on the stack
   before being called.  */

static const struct tramp_frame mips_irix_n32_stack_tramp_frame =
{
  SIGTRAMP_FRAME,
  4,
  {
   { 0x8f210000, 0xffff0000 },  /* lw     at, N(t9) */
   { 0x8f2f0000, 0xffff0000 },  /* lw     t3, M(t9) */
   { 0x00200008, 0xffffffff },  /* jr     at        */
   { 0x0020c82d, 0xffffffff },  /* move   t9, at    */
   { TRAMP_SENTINEL_INSN, -1 }
  },
  mips_irix_n32_stack_tramp_frame_init
};

static void
mips_irix_init_abi (struct gdbarch_info info,
                    struct gdbarch *gdbarch)
{
  set_solib_ops (gdbarch, &irix_so_ops);
  tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_stack_tramp_frame);
  tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
}

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_mips_irix_tdep;

void
_initialize_mips_irix_tdep (void)
{
  /* Register an ELF OS ABI sniffer for IRIX binaries.  */
  gdbarch_register_osabi_sniffer (bfd_arch_mips,
				  bfd_target_elf_flavour,
				  mips_irix_elf_osabi_sniffer);

  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
			  mips_irix_init_abi);
}
Commit	Line	Data
b96d0a4e KB	1	/* Target-dependent code for the MIPS architecture running on IRIX,
	2	for GDB, the GNU Debugger.
	3
ecd75fc8	4	Copyright (C) 2002-2014 Free Software Foundation, Inc.
b96d0a4e KB	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
a9762ec7	10	the Free Software Foundation; either version 3 of the License, or
b96d0a4e KB	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
a9762ec7	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
b96d0a4e KB	20
	21	#include "defs.h"
	22	#include "osabi.h"
0e9f083f	23	#include <string.h>
734598d9 UW	24	#include "solib.h"
734598d9 UW	25	#include "solib-irix.h"
b96d0a4e	26	#include "elf-bfd.h"
6d8eadbd JB	27	#include "mips-tdep.h"
	28	#include "trad-frame.h"
	29	#include "tramp-frame.h"
b96d0a4e KB	30
	31	static void
	32	mips_irix_elf_osabi_sniff_abi_tag_sections (bfd abfd, asection sect,
	33	void *obj)
	34	{
	35	enum gdb_osabi *os_ident_ptr = obj;
	36	const char *name;
	37	unsigned int sectsize;
	38
	39	name = bfd_get_section_name (abfd, sect);
	40	sectsize = bfd_section_size (abfd, sect);
	41
	42	if (strncmp (name, ".MIPS.", 6) == 0 && sectsize > 0)
	43	{
	44	/* The presence of a section named with a ".MIPS." prefix is
	45	indicative of an IRIX binary. */
	46	*os_ident_ptr = GDB_OSABI_IRIX;
	47	}
	48	}
	49
	50	static enum gdb_osabi
	51	mips_irix_elf_osabi_sniffer (bfd *abfd)
	52	{
	53	unsigned int elfosabi;
	54	enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
	55
	56	/* If the generic sniffer gets a hit, return and let other sniffers
	57	get a crack at it. */
	58	bfd_map_over_sections (abfd,
	59	generic_elf_osabi_sniff_abi_tag_sections,
	60	&osabi);
	61	if (osabi != GDB_OSABI_UNKNOWN)
	62	return GDB_OSABI_UNKNOWN;
	63
	64	elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
	65
	66	if (elfosabi == ELFOSABI_NONE)
	67	{
	68	/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
	69	file are conforming to the base specification for that machine
	70	(there are no OS-specific extensions). In order to determine the
025bb325	71	real OS in use we must look for OS notes that have been added.
b96d0a4e KB	72
	73	For IRIX, we simply look for sections named with .MIPS. as
	74	prefixes. */
	75	bfd_map_over_sections (abfd,
	76	mips_irix_elf_osabi_sniff_abi_tag_sections,
	77	&osabi);
	78	}
	79	return osabi;
	80	}
	81
6d8eadbd JB	82	/* Unwinding past the signal handler on mips-irix.
	83
	84	Note: The following has only been tested with N32, but can probably
	85	be made to work with a small number of adjustments.
	86
	87	On mips-irix, the sigcontext_t structure is stored at the base
	88	of the frame established by the _sigtramp function. The definition
	89	of this structure can be found in <sys/signal.h> (comments have been
	90	C++'ified to avoid a collision with the C-style comment delimiters
	91	used by this comment):
	92
	93	typedef struct sigcontext {
	94	__uint32_t sc_regmask; // regs to restore in sigcleanup
	95	__uint32_t sc_status; // cp0 status register
	96	__uint64_t sc_pc; // pc at time of signal
	97	// General purpose registers
	98	__uint64_t sc_regs[32]; // processor regs 0 to 31
	99	// Floating point coprocessor state
	100	__uint64_t sc_fpregs[32]; // fp regs 0 to 31
	101	__uint32_t sc_ownedfp; // fp has been used
	102	__uint32_t sc_fpc_csr; // fpu control and status reg
	103	__uint32_t sc_fpc_eir; // fpu exception instruction reg
	104	// implementation/revision
	105	__uint32_t sc_ssflags; // signal stack state to restore
	106	__uint64_t sc_mdhi; // Multiplier hi and low regs
	107	__uint64_t sc_mdlo;
	108	// System coprocessor registers at time of signal
	109	__uint64_t sc_cause; // cp0 cause register
	110	__uint64_t sc_badvaddr; // cp0 bad virtual address
	111	__uint64_t sc_triggersave; // state of graphics trigger (SGI)
	112	sigset_t sc_sigset; // signal mask to restore
	113	__uint64_t sc_fp_rounded_result; // for Ieee 754 support
	114	__uint64_t sc_pad[31];
	115	} sigcontext_t;
	116
	117	The following macros provide the offset of some of the fields
	118	used to retrieve the value of the registers before the signal
	119	was raised. */
	120
	121	/* The size of the sigtramp frame. The sigtramp frame base can then
	122	be computed by adding this size to the SP. */
	123	#define SIGTRAMP_FRAME_SIZE 48
	124	/* The offset in sigcontext_t where the PC is saved. */
	125	#define SIGCONTEXT_PC_OFF 8
	126	/* The offset in sigcontext_t where the GP registers are saved. */
	127	#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
	128	/* The offset in sigcontext_t where the FP regsiters are saved. */
	129	#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
	130	/* The offset in sigcontext_t where the FP CSR register is saved. */
	131	#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
	132	/* The offset in sigcontext_t where the multiplier hi register is saved. */
	133	#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
	134	/* The offset in sigcontext_t where the multiplier lo register is saved. */
	135	#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
	136
	137	/* Implement the "init" routine in struct tramp_frame for the N32 ABI
	138	on mips-irix. */
	139	static void
	140	mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
	141	struct frame_info *this_frame,
	142	struct trad_frame_cache *this_cache,
	143	CORE_ADDR func)
	144	{
	145	struct gdbarch *gdbarch = get_frame_arch (this_frame);
146	const int num_regs = gdbarch_num_regs (gdbarch);
147	int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
148	const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
149	const CORE_ADDR sigcontext_base = sp + 48;
150	const struct mips_regnum *regs = mips_regnum (gdbarch);
151	int ireg;
152
153	trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
154	sigcontext_base + SIGCONTEXT_PC_OFF);
155
156	for (ireg = 1; ireg < 32; ireg++)
157	trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
158	sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
159
160	for (ireg = 0; ireg < 32; ireg++)
161	trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
162	sigcontext_base + SIGCONTEXT_FPREGS_OFF
163	+ ireg * 8);
164
165	trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
166	sigcontext_base + SIGCONTEXT_FPCSR_OFF);
167
168	trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
169	sigcontext_base + SIGCONTEXT_HI_OFF);
170
171	trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
172	sigcontext_base + SIGCONTEXT_LO_OFF);
173
174	trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
175	}
176
177	/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
178
179	Note that the list of instructions below is pretty much a pure dump
180	of function _sigtramp on mips-irix. A few instructions are actually
181	not tested (mask set to 0), because a portion of these instructions
182	contain an address which changes due to relocation. We could use
183	a smarter mask that checks the instrutction code alone, but given
184	the number of instructions already being checked, this seemed
185	unnecessary. */
186
187	static const struct tramp_frame mips_irix_n32_tramp_frame =
188	{
189	SIGTRAMP_FRAME,
190	4,
191	{
192	{ 0x3c0c8000, -1 }, /* lui t0,0x8000 */
193	{ 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */
194	{ 0x008c6024, -1 }, /* and t0,a0,t0 */
195	{ 0xffa40018, -1 }, /* sd a0,24(sp) */
196	{ 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */
197	{ 0xffa60028, -1 }, /* sd a2,40(sp) */
198	{ 0x01806027, -1 }, /* nor t0,t0,zero */
199	{ 0xffa00020, -1 }, /* sd zero,32(sp) */
200	{ 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */
201	{ 0x008c2024, -1 }, /* and a0,a0,t0 */
202	{ 0xffa60020, -1 }, /* sd a2,32(sp) */
203	{ 0x03e0c025, -1 }, /* move t8,ra */
204	{ 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */
205	{ 0x00000000, -1 }, /* nop */
206	{ 0x3c0c0007, -1 }, /* lui t0,0x7 */
207	{ 0x00e0c825, -1 }, /* move t9,a3 */
208	{ 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */
209	{ 0x019f602d, -1 }, /* daddu t0,t0,ra */
210	{ 0x0300f825, -1 }, /* move ra,t8 */
211	{ 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */
212	{ 0x8d8c0000, -1 }, /* lw t0,0(t0) */
213	{ 0x8d8d0000, -1 }, /* lw t1,0(t0) */
214	{ 0xffac0008, -1 }, /* sd t0,8(sp) */
215	{ 0x0320f809, -1 }, /* jalr t9 */
216	{ 0xffad0010, -1 }, /* sd t1,16(sp) */
217	{ 0xdfad0010, -1 }, /* ld t1,16(sp) */
218	{ 0xdfac0008, -1 }, /* ld t0,8(sp) */
219	{ 0xad8d0000, -1 }, /* sw t1,0(t0) */
220	{ 0xdfa40020, -1 }, /* ld a0,32(sp) */
221	{ 0xdfa50028, -1 }, /* ld a1,40(sp) */
222	{ 0xdfa60018, -1 }, /* ld a2,24(sp) */
223	{ 0x24020440, -1 }, /* li v0,1088 */
224	{ 0x0000000c, -1 }, /* syscall */
225	{ TRAMP_SENTINEL_INSN, -1 }
226	},
227	mips_irix_n32_tramp_frame_init
228	};
229
1324a0d9 JB	230	/* Implement the "init" routine in struct tramp_frame for the stack-based
	231	trampolines used on mips-irix. */
	232
	233	static void
	234	mips_irix_n32_stack_tramp_frame_init (const struct tramp_frame *self,
	235	struct frame_info *this_frame,
	236	struct trad_frame_cache *this_cache,
	237	CORE_ADDR func)
	238	{
	239	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	240	const int num_regs = gdbarch_num_regs (gdbarch);
	241	int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
	242	const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
	243
	244	/* The previous frame's PC is stored in RA. */
	245	trad_frame_set_reg_realreg (this_cache, gdbarch_pc_regnum (gdbarch),
	246	num_regs + MIPS_RA_REGNUM);
	247
	248	trad_frame_set_id (this_cache, frame_id_build (sp, func));
	249	}
	250
	251	/* A tramp_frame structure describing the stack-based trampoline
	252	used on mips-irix. These trampolines are created on the stack
	253	before being called. */
	254
	255	static const struct tramp_frame mips_irix_n32_stack_tramp_frame =
	256	{
	257	SIGTRAMP_FRAME,
	258	4,
	259	{
	260	{ 0x8f210000, 0xffff0000 }, /* lw at, N(t9) */
	261	{ 0x8f2f0000, 0xffff0000 }, /* lw t3, M(t9) */
	262	{ 0x00200008, 0xffffffff }, /* jr at */
	263	{ 0x0020c82d, 0xffffffff }, /* move t9, at */
	264	{ TRAMP_SENTINEL_INSN, -1 }
	265	},
	266	mips_irix_n32_stack_tramp_frame_init
	267	};
	268
b96d0a4e KB	269	static void
	270	mips_irix_init_abi (struct gdbarch_info info,
	271	struct gdbarch *gdbarch)
	272	{
734598d9	273	set_solib_ops (gdbarch, &irix_so_ops);
1324a0d9	274	tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_stack_tramp_frame);
6d8eadbd	275	tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
b96d0a4e KB	276	}
b96d0a4e KB	277
63807e1d PA	278	/* Provide a prototype to silence -Wmissing-prototypes. */
	279	extern initialize_file_ftype _initialize_mips_irix_tdep;
	280
b96d0a4e KB	281	void
	282	_initialize_mips_irix_tdep (void)
	283	{
	284	/* Register an ELF OS ABI sniffer for IRIX binaries. */
	285	gdbarch_register_osabi_sniffer (bfd_arch_mips,
	286	bfd_target_elf_flavour,
	287	mips_irix_elf_osabi_sniffer);
	288
05816f70	289	gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
b96d0a4e KB	290	mips_irix_init_abi);
b96d0a4e KB	291	}