/* Target-dependent code for GNU/Linux on Nios II.
- Copyright (C) 2012-2013 Free Software Foundation, Inc.
+ Copyright (C) 2012-2015 Free Software Foundation, Inc.
Contributed by Mentor Graphics, Inc.
This file is part of GDB.
#include "defs.h"
#include "frame.h"
-#include "gdb_assert.h"
-#include <string.h>
#include "osabi.h"
#include "solib-svr4.h"
#include "trad-frame.h"
-1, -1, -1, -1, -1, -1, -1, -1
};
+/* General register set size. Should match sizeof (struct pt_regs) +
+ sizeof (struct switch_stack) from the NIOS2 Linux kernel patch. */
+
+#define NIOS2_GREGS_SIZE (4 * 34)
+
/* Implement the supply_regset hook for core files. */
static void
}
}
-static struct regset nios2_core_regset =
+/* Implement the collect_regset hook for core files. */
+
+static void
+nios2_collect_gregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *gregs_buf, size_t len)
+{
+ gdb_byte *gregs = gregs_buf;
+ int regno;
+
+ for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++)
+ if (regnum == -1 || regnum == regno)
+ {
+ if (reg_offsets[regno] != -1)
+ regcache_raw_collect (regcache, regno,
+ gregs + 4 * reg_offsets[regno]);
+ }
+}
+
+static const struct regset nios2_core_regset =
{
NULL,
nios2_supply_gregset,
- NULL,
- NULL
+ nios2_collect_gregset
};
-/* Implement the regset_from_core_section gdbarch method. */
+/* Iterate over core file register note sections. */
-static const struct regset *
-nios2_regset_from_core_section (struct gdbarch *gdbarch,
- const char *sect_name, size_t sect_size)
+static void
+nios2_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
{
- if (strcmp (sect_name, ".reg") == 0)
- return &nios2_core_regset;
-
- return NULL;
+ cb (".reg", NIOS2_GREGS_SIZE, &nios2_core_regset, NULL, cb_data);
}
/* Initialize a trad-frame cache corresponding to the tramp-frame.
- FUNC is the address of the instruction TRAMP[0] in memory. */
+ FUNC is the address of the instruction TRAMP[0] in memory.
-static void
-nios2_linux_sigreturn_init (const struct tramp_frame *self,
- struct frame_info *next_frame,
- struct trad_frame_cache *this_cache,
- CORE_ADDR func)
-{
- CORE_ADDR base = func + 16;
- int i;
+ This ABI is not documented. It corresponds to rt_setup_ucontext in
+ the kernel arch/nios2/kernel/signal.c file.
- for (i = 0; i < 8; i++)
- trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4);
- for (i = 0; i < 7; i++)
- trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4);
- trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4);
+ The key points are:
+ - The kernel creates a trampoline at the hard-wired address 0x1044.
+ - The stack pointer points to an object of type struct rt_sigframe.
+ The definition of this structure is not exported from the kernel.
+ The register save area is located at offset 152 bytes (as determined
+ by inspection of the stack contents in the debugger), and the
+ registers are saved as r1-r23, ra, fp, gp, ea, sp.
- /* Save a frame ID. */
- trad_frame_set_id (this_cache, frame_id_build (base, func));
-}
+ This interface was implemented with kernel version 3.19 (the first
+ official mainline kernel). Older unofficial kernel versions used
+ incompatible conventions; we do not support those here. */
-/* Initialize a trad-frame cache corresponding to the tramp-frame.
- FUNC is the address of the instruction TRAMP[0] in memory. */
+#define NIOS2_SIGRETURN_TRAMP_ADDR 0x1044
+#define NIOS2_SIGRETURN_REGSAVE_OFFSET 152
static void
nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
- CORE_ADDR base = func + 41 * 4;
+ CORE_ADDR sp = get_frame_register_unsigned (next_frame, NIOS2_SP_REGNUM);
+ CORE_ADDR base = sp + NIOS2_SIGRETURN_REGSAVE_OFFSET;
int i;
for (i = 0; i < 23; i++)
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
-static struct tramp_frame nios2_linux_sigreturn_tramp_frame =
-{
- SIGTRAMP_FRAME,
- 4,
- {
- { 0x00800004 | (119 << 6), -1 }, /* movi r2,__NR_sigreturn */
- { 0x003b683a, -1 }, /* trap */
- { TRAMP_SENTINEL_INSN }
- },
- nios2_linux_sigreturn_init
-};
-
static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame =
{
SIGTRAMP_FRAME,
4,
{
- { 0x00800004 | (173 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */
+ { 0x00800004 | (139 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */
{ 0x003b683a, -1 }, /* trap */
{ TRAMP_SENTINEL_INSN }
},
/* If we are about to make a sigreturn syscall, use the unwinder to
decode the signal frame. */
- if (syscall_nr == 119 /* sigreturn */
- || syscall_nr == 173 /* rt_sigreturn */)
+ if (syscall_nr == 139 /* rt_sigreturn */)
return frame_unwind_caller_pc (frame);
return pc + NIOS2_OPCODE_SIZE;
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Core file support. */
- set_gdbarch_regset_from_core_section (gdbarch,
- nios2_regset_from_core_section);
+ set_gdbarch_iterate_over_regset_sections
+ (gdbarch, nios2_iterate_over_regset_sections);
/* Linux signal frame unwinders. */
- tramp_frame_prepend_unwinder (gdbarch,
- &nios2_linux_sigreturn_tramp_frame);
tramp_frame_prepend_unwinder (gdbarch,
&nios2_linux_rt_sigreturn_tramp_frame);
projects / deliverable / binutils-gdb.git / blobdiff