/* Target-dependent code for GNU/Linux UltraSPARC.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003-2019 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "regset.h"
+#include "regcache.h"
#include "gdbarch.h"
+#include "gdbcore.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
+#include "tramp-frame.h"
+#include "xml-syscall.h"
+#include "linux-tdep.h"
+
+/* ADI specific si_code */
+#ifndef SEGV_ACCADI
+#define SEGV_ACCADI 3
+#endif
+#ifndef SEGV_ADIDERR
+#define SEGV_ADIDERR 4
+#endif
+#ifndef SEGV_ADIPERR
+#define SEGV_ADIPERR 5
+#endif
+
+/* The syscall's XML filename for sparc 64-bit. */
+#define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml"
#include "sparc64-tdep.h"
-/* The instruction sequence for RT signals is
- mov __NR_rt_sigreturn, %g1 ! hex: 0x82102065
- ta 0x6d ! hex: 0x91d0206d
+/* Signal trampoline support. */
- The effect is to call the system call rt_sigreturn.
- Note that 64-bit binaries only use this RT signal return method. */
+static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func);
-#define LINUX64_RT_SIGTRAMP_INSN0 0x82102065
-#define LINUX64_RT_SIGTRAMP_INSN1 0x91d0206d
+/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
+ use RT signals. */
-/* If PC is in a sigtramp routine consisting of the instructions
- LINUX64_RT_SIGTRAMP_INSN0 and LINUX64_RT_SIGTRAMP_INSN1, return
- the address of the start of the routine. Otherwise, return 0. */
+static const struct tramp_frame sparc64_linux_rt_sigframe =
+{
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { 0x82102065, ULONGEST_MAX }, /* mov __NR_rt_sigreturn, %g1 */
+ { 0x91d0206d, ULONGEST_MAX }, /* ta 0x6d */
+ { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
+ },
+ sparc64_linux_sigframe_init
+};
-static CORE_ADDR
-sparc64_linux_sigtramp_start (struct frame_info *next_frame)
+static void
+sparc64_linux_sigframe_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
{
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- ULONGEST word0, word1;
- unsigned char buf[8]; /* Two instructions. */
-
- /* We only recognize a signal trampoline if PC is at the start of
- one of the instructions. We optimize for finding the PC at the
- start of the instruction sequence, as will be the case when the
- trampoline is not the first frame on the stack. We assume that
- in the case where the PC is not at the start of the instruction
- sequence, there will be a few trailing readable bytes on the
- stack. */
-
- if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
- return 0;
+ CORE_ADDR base, addr, sp_addr;
+ int regnum;
- word0 = extract_unsigned_integer (buf, 4);
- if (word0 != LINUX64_RT_SIGTRAMP_INSN0)
- {
- if (word0 != LINUX64_RT_SIGTRAMP_INSN1)
- return 0;
+ base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
+ base += 128;
- pc -= 4;
- if (!safe_frame_unwind_memory (next_frame, pc, buf, sizeof buf))
- return 0;
+ /* Offsets from <bits/sigcontext.h>. */
- word0 = extract_unsigned_integer (buf, 4);
+ /* Since %g0 is always zero, keep the identity encoding. */
+ addr = base + 8;
+ sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
+ for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
+ {
+ trad_frame_set_reg_addr (this_cache, regnum, addr);
+ addr += 8;
}
- word1 = extract_unsigned_integer (buf + 4, 4);
- if (word0 != LINUX64_RT_SIGTRAMP_INSN0
- || word1 != LINUX64_RT_SIGTRAMP_INSN1)
- return 0;
-
- return pc;
-}
-
-static int
-sparc64_linux_sigtramp_p (struct frame_info *next_frame)
-{
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- char *name;
+ trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
+ trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
+ trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
+ trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
+ trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
- find_pc_partial_function (pc, &name, NULL, NULL);
+ base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
+ if (base & 1)
+ base += BIAS;
- /* If we have NAME, we can optimize the search. The trampolines is
- named __rt_sigreturn_stub. However, is isn't dynamically exported
- from the shared C library, so the trampoline may appear to be part
- of the preceding function. This should always be sigaction,
- __sigaction, or __libc_sigaction (all aliases to the same function). */
- if (name == NULL || strstr (name, "sigaction") != NULL)
- return (sparc64_linux_sigtramp_start (next_frame) != 0);
+ addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
+ if (addr & 1)
+ addr += BIAS;
- return (strcmp ("__rt_sigreturn_stub", name) == 0);
+ for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
+ {
+ trad_frame_set_reg_addr (this_cache, regnum, addr);
+ addr += 8;
+ }
+ trad_frame_set_id (this_cache, frame_id_build (base, func));
}
-static struct sparc_frame_cache *
-sparc64_linux_sigtramp_frame_cache (struct frame_info *next_frame,
- void **this_cache)
+/* sparc64 GNU/Linux implementation of the handle_segmentation_fault
+ gdbarch hook.
+ Displays information related to ADI memory corruptions. */
+
+static void
+sparc64_linux_handle_segmentation_fault (struct gdbarch *gdbarch,
+ struct ui_out *uiout)
{
- struct sparc_frame_cache *cache;
- CORE_ADDR sigcontext_addr, addr;
- int regnum;
+ if (gdbarch_bfd_arch_info (gdbarch)->bits_per_word != 64)
+ return;
- if (*this_cache)
- return *this_cache;
+ CORE_ADDR addr = 0;
+ long si_code = 0;
- cache = sparc_frame_cache (next_frame, this_cache);
- gdb_assert (cache == *this_cache);
+ try
+ {
+ /* Evaluate si_code to see if the segfault is ADI related. */
+ si_code = parse_and_eval_long ("$_siginfo.si_code\n");
- regnum = SPARC_SP_REGNUM;
- cache->base = frame_unwind_register_unsigned (next_frame, regnum);
- if (cache->base & 1)
- cache->base += BIAS;
+ if (si_code >= SEGV_ACCADI && si_code <= SEGV_ADIPERR)
+ addr = parse_and_eval_long ("$_siginfo._sifields._sigfault.si_addr");
+ }
+ catch (const gdb_exception &exception)
+ {
+ return;
+ }
- regnum = SPARC_O1_REGNUM;
- sigcontext_addr = frame_unwind_register_unsigned (next_frame, regnum);
+ /* Print out ADI event based on sig_code value */
+ switch (si_code)
+ {
+ case SEGV_ACCADI: /* adi not enabled */
+ uiout->text ("\n");
+ uiout->field_string ("sigcode-meaning", _("ADI disabled"));
+ uiout->text (_(" while accessing address "));
+ uiout->field_core_addr ("bound-access", gdbarch, addr);
+ break;
+ case SEGV_ADIDERR: /* disrupting mismatch */
+ uiout->text ("\n");
+ uiout->field_string ("sigcode-meaning", _("ADI deferred mismatch"));
+ uiout->text (_(" while accessing address "));
+ uiout->field_core_addr ("bound-access", gdbarch, addr);
+ break;
+ case SEGV_ADIPERR: /* precise mismatch */
+ uiout->text ("\n");
+ uiout->field_string ("sigcode-meaning", _("ADI precise mismatch"));
+ uiout->text (_(" while accessing address "));
+ uiout->field_core_addr ("bound-access", gdbarch, addr);
+ break;
+ default:
+ break;
+ }
- /* If this is a RT signal trampoline, adjust SIGCONTEXT_ADDR
- accordingly. */
- addr = sparc64_linux_sigtramp_start (next_frame);
- if (addr)
- sigcontext_addr += 128;
- else
- addr = frame_func_unwind (next_frame);
+}
- cache->pc = addr;
+\f
+/* Return the address of a system call's alternative return
+ address. */
- cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+static CORE_ADDR
+sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
+{
+ /* __NR_rt_sigreturn is 101 */
+ if ((insn == 0x91d0206d)
+ && (get_frame_register_unsigned (frame, SPARC_G1_REGNUM) == 101))
+ {
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- /* Offsets from <bits/sigcontext.h> */
+ ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
+ if (sp & 1)
+ sp += BIAS;
- /* Since %g0 is always zero, keep the identity encoding. */
- for (addr = sigcontext_addr + 8, regnum = SPARC_G1_REGNUM;
- regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
- cache->saved_regs[regnum].addr = addr;
+ /* The kernel puts the sigreturn registers on the stack,
+ and this is where the signal unwinding state is take from
+ when returning from a signal.
+
+ A siginfo_t sits 192 bytes from the base of the stack. This
+ siginfo_t is 128 bytes, and is followed by the sigreturn
+ register save area. The saved PC sits at a 136 byte offset
+ into there. */
- cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 0;
- cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 8;
- cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 16;
- cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 24;
- cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 28;
+ return read_memory_unsigned_integer (sp + 192 + 128 + 136,
+ 8, byte_order);
+ }
+
+ return 0;
+}
+\f
- for (regnum = SPARC_L0_REGNUM, addr = cache->base;
- regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
- cache->saved_regs[regnum].addr = addr;
+const struct sparc_gregmap sparc64_linux_core_gregmap =
+{
+ 32 * 8, /* %tstate */
+ 33 * 8, /* %tpc */
+ 34 * 8, /* %tnpc */
+ 35 * 8, /* %y */
+ -1, /* %wim */
+ -1, /* %tbr */
+ 1 * 8, /* %g1 */
+ 16 * 8, /* %l0 */
+ 8, /* y size */
+};
+\f
- return cache;
+static void
+sparc64_linux_supply_core_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ sparc64_supply_gregset (&sparc64_linux_core_gregmap,
+ regcache, regnum, gregs);
}
static void
-sparc64_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
- void **this_cache,
- struct frame_id *this_id)
+sparc64_linux_collect_core_gregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *gregs, size_t len)
{
- struct sparc_frame_cache *cache =
- sparc64_linux_sigtramp_frame_cache (next_frame, this_cache);
+ sparc64_collect_gregset (&sparc64_linux_core_gregmap,
+ regcache, regnum, gregs);
+}
- (*this_id) = frame_id_build (cache->base, cache->pc);
+static void
+sparc64_linux_supply_core_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *fpregs, size_t len)
+{
+ sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
}
static void
-sparc64_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
- void **this_cache,
- int regnum, int *optimizedp,
- enum lval_type *lvalp,
- CORE_ADDR *addrp,
- int *realnump, void *valuep)
+sparc64_linux_collect_core_fpregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *fpregs, size_t len)
{
- struct sparc_frame_cache *cache =
- sparc64_linux_sigtramp_frame_cache (next_frame, this_cache);
+ sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
+}
+
+/* Set the program counter for process PTID to PC. */
- trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+#define TSTATE_SYSCALL 0x0000000000000020ULL
+
+static void
+sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ());
+ ULONGEST state;
+
+ regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
+ regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);
+
+ /* Clear the "in syscall" bit to prevent the kernel from
+ messing with the PCs we just installed, if we happen to be
+ within an interrupted system call that the kernel wants to
+ restart.
+
+ Note that after we return from the dummy call, the TSTATE et al.
+ registers will be automatically restored, and the kernel
+ continues to restart the system call at this point. */
+ regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
+ state &= ~TSTATE_SYSCALL;
+ regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
}
-static const struct frame_unwind sparc64_linux_sigtramp_frame_unwind =
+static LONGEST
+sparc64_linux_get_syscall_number (struct gdbarch *gdbarch,
+ thread_info *thread)
{
- SIGTRAMP_FRAME,
- sparc64_linux_sigtramp_frame_this_id,
- sparc64_linux_sigtramp_frame_prev_register
-};
+ struct regcache *regcache = get_thread_regcache (thread);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ /* The content of a register. */
+ gdb_byte buf[8];
+ /* The result. */
+ LONGEST ret;
-static const struct frame_unwind *
-sparc64_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
+ /* Getting the system call number from the register.
+ When dealing with the sparc architecture, this information
+ is stored at the %g1 register. */
+ regcache->cooked_read (SPARC_G1_REGNUM, buf);
+
+ ret = extract_signed_integer (buf, 8, byte_order);
+
+ return ret;
+}
+
+\f
+/* Implement the "get_longjmp_target" gdbarch method. */
+
+static int
+sparc64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
- if (sparc64_linux_sigtramp_p (next_frame))
- return &sparc64_linux_sigtramp_frame_unwind;
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ CORE_ADDR jb_addr;
+ gdb_byte buf[8];
+
+ jb_addr = get_frame_register_unsigned (frame, SPARC_O0_REGNUM);
+
+ /* setjmp and longjmp in SPARC64 are implemented in glibc using the
+ setcontext and getcontext system calls respectively. These
+ system calls operate on ucontext_t structures, which happen to
+ partially have the same structure than jmp_buf. However the
+ ucontext returned by getcontext, and thus the jmp_buf structure
+ returned by setjmp, contains the context of the trap instruction
+ in the glibc __[sig]setjmp wrapper, not the context of the user
+ code calling setjmp.
+
+ %o7 in the jmp_buf structure is stored at offset 18*8 in the
+ mc_gregs array, which is itself located at offset 32 into
+ jmp_buf. See bits/setjmp.h. This register contains the address
+ of the 'call setjmp' instruction in user code.
+
+ In order to determine the longjmp target address in the
+ initiating frame we need to examine the call instruction itself,
+ in particular whether the annul bit is set. If it is not set
+ then we need to jump over the instruction at the delay slot. */
+
+ if (target_read_memory (jb_addr + 32 + (18 * 8), buf, 8))
+ return 0;
+
+ *pc = extract_unsigned_integer (buf, 8, gdbarch_byte_order (gdbarch));
+
+ if (!sparc_is_annulled_branch_insn (*pc))
+ *pc += 4; /* delay slot insn */
+ *pc += 4; /* call insn */
- return NULL;
+ return 1;
}
+
\f
+
+static const struct regset sparc64_linux_gregset =
+ {
+ NULL,
+ sparc64_linux_supply_core_gregset,
+ sparc64_linux_collect_core_gregset
+ };
+
+static const struct regset sparc64_linux_fpregset =
+ {
+ NULL,
+ sparc64_linux_supply_core_fpregset,
+ sparc64_linux_collect_core_fpregset
+ };
+
static void
sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- frame_unwind_append_sniffer (gdbarch, sparc64_linux_sigtramp_frame_sniffer);
+ linux_init_abi (info, gdbarch);
+
+ tdep->gregset = &sparc64_linux_gregset;
+ tdep->sizeof_gregset = 288;
- /* GNU/Linux is very similar to Solaris ... */
- sparc64_sol2_init_abi (info, gdbarch);
+ tdep->fpregset = &sparc64_linux_fpregset;
+ tdep->sizeof_fpregset = 280;
- /* ... but doesn't have kernel-assisted single-stepping support. */
- set_gdbarch_software_single_step (gdbarch, sparc_software_single_step);
+ tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
+
+ /* Hook in the DWARF CFI frame unwinder. */
+ dwarf2_append_unwinders (gdbarch);
+
+ sparc64_init_abi (info, gdbarch);
+
+ /* GNU/Linux has SVR4-style shared libraries... */
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+ /* ...which means that we need some special handling when doing
+ prologue analysis. */
+ tdep->plt_entry_size = 16;
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
-}
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern void _initialize_sparc64_linux_tdep (void);
+ /* Make sure we can single-step over signal return system calls. */
+ tdep->step_trap = sparc64_linux_step_trap;
+
+ /* Make sure we can single-step over longjmp calls. */
+ set_gdbarch_get_longjmp_target (gdbarch, sparc64_linux_get_longjmp_target);
+
+ set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
+
+ /* Functions for 'catch syscall'. */
+ set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC64);
+ set_gdbarch_get_syscall_number (gdbarch,
+ sparc64_linux_get_syscall_number);
+ set_gdbarch_handle_segmentation_fault (gdbarch,
+ sparc64_linux_handle_segmentation_fault);
+}
void
_initialize_sparc64_linux_tdep (void)
projects / deliverable / binutils-gdb.git / blobdiff