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- /* Target-dependent code for GNU/Linux running on PA-RISC, for GDB.
- Copyright (C) 2004-2022 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 "gdbcore.h"
- #include "osabi.h"
- #include "target.h"
- #include "objfiles.h"
- #include "solib-svr4.h"
- #include "glibc-tdep.h"
- #include "frame-unwind.h"
- #include "trad-frame.h"
- #include "dwarf2/frame.h"
- #include "value.h"
- #include "regset.h"
- #include "regcache.h"
- #include "hppa-tdep.h"
- #include "linux-tdep.h"
- #include "elf/common.h"
- /* Map DWARF DBX register numbers to GDB register numbers. */
- static int
- hppa_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
- {
- /* The general registers and the sar are the same in both sets. */
- if (reg >= 0 && reg <= 32)
- return reg;
- /* fr4-fr31 (left and right halves) are mapped from 72. */
- if (reg >= 72 && reg <= 72 + 28 * 2)
- return HPPA_FP4_REGNUM + (reg - 72);
- return -1;
- }
- static void
- hppa_linux_target_write_pc (struct regcache *regcache, CORE_ADDR v)
- {
- /* Probably this should be done by the kernel, but it isn't. */
- regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, v | 0x3);
- regcache_cooked_write_unsigned (regcache,
- HPPA_PCOQ_TAIL_REGNUM, (v + 4) | 0x3);
- }
- /* An instruction to match. */
- struct insn_pattern
- {
- unsigned int data; /* See if it matches this.... */
- unsigned int mask; /* ... with this mask. */
- };
- static struct insn_pattern hppa_sigtramp[] = {
- /* ldi 0, %r25 or ldi 1, %r25 */
- { 0x34190000, 0xfffffffd },
- /* ldi __NR_rt_sigreturn, %r20 */
- { 0x3414015a, 0xffffffff },
- /* be,l 0x100(%sr2, %r0), %sr0, %r31 */
- { 0xe4008200, 0xffffffff },
- /* nop */
- { 0x08000240, 0xffffffff },
- { 0, 0 }
- };
- #define HPPA_MAX_INSN_PATTERN_LEN (4)
- /* Return non-zero if the instructions at PC match the series
- described in PATTERN, or zero otherwise. PATTERN is an array of
- 'struct insn_pattern' objects, terminated by an entry whose mask is
- zero.
- When the match is successful, fill INSN[i] with what PATTERN[i]
- matched. */
- static int
- insns_match_pattern (struct gdbarch *gdbarch, CORE_ADDR pc,
- struct insn_pattern *pattern,
- unsigned int *insn)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int i;
- CORE_ADDR npc = pc;
- for (i = 0; pattern[i].mask; i++)
- {
- gdb_byte buf[4];
- target_read_memory (npc, buf, 4);
- insn[i] = extract_unsigned_integer (buf, 4, byte_order);
- if ((insn[i] & pattern[i].mask) == pattern[i].data)
- npc += 4;
- else
- return 0;
- }
- return 1;
- }
- /* Signal frames. */
- /* (This is derived from MD_FALLBACK_FRAME_STATE_FOR in gcc.)
-
- Unfortunately, because of various bugs and changes to the kernel,
- we have several cases to deal with.
- In 2.4, the signal trampoline is 4 bytes, and pc should point directly at
- the beginning of the trampoline and struct rt_sigframe.
- In <= 2.6.5-rc2-pa3, the signal trampoline is 9 bytes, and pc points at
- the 4th word in the trampoline structure. This is wrong, it should point
- at the 5th word. This is fixed in 2.6.5-rc2-pa4.
- To detect these cases, we first take pc, align it to 64-bytes
- to get the beginning of the signal frame, and then check offsets 0, 4
- and 5 to see if we found the beginning of the trampoline. This will
- tell us how to locate the sigcontext structure.
- Note that with a 2.4 64-bit kernel, the signal context is not properly
- passed back to userspace so the unwind will not work correctly. */
- static CORE_ADDR
- hppa_linux_sigtramp_find_sigcontext (struct gdbarch *gdbarch, CORE_ADDR pc)
- {
- unsigned int dummy[HPPA_MAX_INSN_PATTERN_LEN];
- int offs = 0;
- int attempt;
- /* offsets to try to find the trampoline */
- static int pcoffs[] = { 0, 4*4, 5*4 };
- /* offsets to the rt_sigframe structure */
- static int sfoffs[] = { 4*4, 10*4, 10*4 };
- CORE_ADDR sp;
- /* Most of the time, this will be correct. The one case when this will
- fail is if the user defined an alternate stack, in which case the
- beginning of the stack will not be align_down (pc, 64). */
- sp = align_down (pc, 64);
- /* rt_sigreturn trampoline:
- 3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2)
- 3414015a ldi __NR_rt_sigreturn, %r20
- e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31
- 08000240 nop */
- for (attempt = 0; attempt < ARRAY_SIZE (pcoffs); attempt++)
- {
- if (insns_match_pattern (gdbarch, sp + pcoffs[attempt],
- hppa_sigtramp, dummy))
- {
- offs = sfoffs[attempt];
- break;
- }
- }
- if (offs == 0)
- {
- if (insns_match_pattern (gdbarch, pc, hppa_sigtramp, dummy))
- {
- /* sigaltstack case: we have no way of knowing which offset to
- use in this case; default to new kernel handling. If this is
- wrong the unwinding will fail. */
- attempt = 2;
- sp = pc - pcoffs[attempt];
- }
- else
- return 0;
- }
- /* sp + sfoffs[try] points to a struct rt_sigframe, which contains
- a struct siginfo and a struct ucontext. struct ucontext contains
- a struct sigcontext. Return an offset to this sigcontext here. Too
- bad we cannot include system specific headers :-(.
- sizeof(struct siginfo) == 128
- offsetof(struct ucontext, uc_mcontext) == 24. */
- return sp + sfoffs[attempt] + 128 + 24;
- }
- struct hppa_linux_sigtramp_unwind_cache
- {
- CORE_ADDR base;
- trad_frame_saved_reg *saved_regs;
- };
- static struct hppa_linux_sigtramp_unwind_cache *
- hppa_linux_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
- void **this_cache)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- struct hppa_linux_sigtramp_unwind_cache *info;
- CORE_ADDR pc, scptr;
- int i;
- if (*this_cache)
- return (struct hppa_linux_sigtramp_unwind_cache *) *this_cache;
- info = FRAME_OBSTACK_ZALLOC (struct hppa_linux_sigtramp_unwind_cache);
- *this_cache = info;
- info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
- pc = get_frame_pc (this_frame);
- scptr = hppa_linux_sigtramp_find_sigcontext (gdbarch, pc);
- /* structure of struct sigcontext:
-
- struct sigcontext {
- unsigned long sc_flags;
- unsigned long sc_gr[32];
- unsigned long long sc_fr[32];
- unsigned long sc_iasq[2];
- unsigned long sc_iaoq[2];
- unsigned long sc_sar; */
- /* Skip sc_flags. */
- scptr += 4;
- /* GR[0] is the psw. */
- info->saved_regs[HPPA_IPSW_REGNUM].set_addr (scptr);
- scptr += 4;
- /* General registers. */
- for (i = 1; i < 32; i++)
- {
- info->saved_regs[HPPA_R0_REGNUM + i].set_addr (scptr);
- scptr += 4;
- }
- /* Pad to long long boundary. */
- scptr += 4;
- /* FP regs; FP0-3 are not restored. */
- scptr += (8 * 4);
- for (i = 4; i < 32; i++)
- {
- info->saved_regs[HPPA_FP0_REGNUM + (i * 2)].set_addr (scptr);
- scptr += 4;
- info->saved_regs[HPPA_FP0_REGNUM + (i * 2) + 1].set_addr (scptr);
- scptr += 4;
- }
- /* IASQ/IAOQ. */
- info->saved_regs[HPPA_PCSQ_HEAD_REGNUM].set_addr (scptr);
- scptr += 4;
- info->saved_regs[HPPA_PCSQ_TAIL_REGNUM].set_addr (scptr);
- scptr += 4;
- info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].set_addr (scptr);
- scptr += 4;
- info->saved_regs[HPPA_PCOQ_TAIL_REGNUM].set_addr (scptr);
- scptr += 4;
- info->saved_regs[HPPA_SAR_REGNUM].set_addr (scptr);
- info->base = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
- return info;
- }
- static void
- hppa_linux_sigtramp_frame_this_id (struct frame_info *this_frame,
- void **this_prologue_cache,
- struct frame_id *this_id)
- {
- struct hppa_linux_sigtramp_unwind_cache *info
- = hppa_linux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
- *this_id = frame_id_build (info->base, get_frame_pc (this_frame));
- }
- static struct value *
- hppa_linux_sigtramp_frame_prev_register (struct frame_info *this_frame,
- void **this_prologue_cache,
- int regnum)
- {
- struct hppa_linux_sigtramp_unwind_cache *info
- = hppa_linux_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
- return hppa_frame_prev_register_helper (this_frame,
- info->saved_regs, regnum);
- }
- /* hppa-linux always uses "new-style" rt-signals. The signal handler's return
- address should point to a signal trampoline on the stack. The signal
- trampoline is embedded in a rt_sigframe structure that is aligned on
- the stack. We take advantage of the fact that sp must be 64-byte aligned,
- and the trampoline is small, so by rounding down the trampoline address
- we can find the beginning of the struct rt_sigframe. */
- static int
- hppa_linux_sigtramp_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *this_frame,
- void **this_prologue_cache)
- {
- struct gdbarch *gdbarch = get_frame_arch (this_frame);
- CORE_ADDR pc = get_frame_pc (this_frame);
- if (hppa_linux_sigtramp_find_sigcontext (gdbarch, pc))
- return 1;
- return 0;
- }
- static const struct frame_unwind hppa_linux_sigtramp_frame_unwind = {
- "hppa linux sigtramp",
- SIGTRAMP_FRAME,
- default_frame_unwind_stop_reason,
- hppa_linux_sigtramp_frame_this_id,
- hppa_linux_sigtramp_frame_prev_register,
- NULL,
- hppa_linux_sigtramp_frame_sniffer
- };
- /* Attempt to find (and return) the global pointer for the given
- function.
- This is a rather nasty bit of code searchs for the .dynamic section
- in the objfile corresponding to the pc of the function we're trying
- to call. Once it finds the addresses at which the .dynamic section
- lives in the child process, it scans the Elf32_Dyn entries for a
- DT_PLTGOT tag. If it finds one of these, the corresponding
- d_un.d_ptr value is the global pointer. */
- static CORE_ADDR
- hppa_linux_find_global_pointer (struct gdbarch *gdbarch,
- struct value *function)
- {
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct obj_section *faddr_sect;
- CORE_ADDR faddr;
-
- faddr = value_as_address (function);
- /* Is this a plabel? If so, dereference it to get the gp value. */
- if (faddr & 2)
- {
- int status;
- gdb_byte buf[4];
- faddr &= ~3;
- status = target_read_memory (faddr + 4, buf, sizeof (buf));
- if (status == 0)
- return extract_unsigned_integer (buf, sizeof (buf), byte_order);
- }
- /* If the address is in the plt section, then the real function hasn't
- yet been fixed up by the linker so we cannot determine the gp of
- that function. */
- if (in_plt_section (faddr))
- return 0;
- faddr_sect = find_pc_section (faddr);
- if (faddr_sect != NULL)
- {
- struct obj_section *osect;
- ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect)
- {
- if (strcmp (osect->the_bfd_section->name, ".dynamic") == 0)
- break;
- }
- if (osect < faddr_sect->objfile->sections_end)
- {
- CORE_ADDR addr, endaddr;
- addr = osect->addr ();
- endaddr = osect->endaddr ();
- while (addr < endaddr)
- {
- int status;
- LONGEST tag;
- gdb_byte buf[4];
- status = target_read_memory (addr, buf, sizeof (buf));
- if (status != 0)
- break;
- tag = extract_signed_integer (buf, byte_order);
- if (tag == DT_PLTGOT)
- {
- CORE_ADDR global_pointer;
- status = target_read_memory (addr + 4, buf, sizeof (buf));
- if (status != 0)
- break;
- global_pointer = extract_unsigned_integer (buf, sizeof (buf),
- byte_order);
- /* The payoff... */
- return global_pointer;
- }
- if (tag == DT_NULL)
- break;
- addr += 8;
- }
- }
- }
- return 0;
- }
- /*
- * Registers saved in a coredump:
- * gr0..gr31
- * sr0..sr7
- * iaoq0..iaoq1
- * iasq0..iasq1
- * sar, iir, isr, ior, ipsw
- * cr0, cr24..cr31
- * cr8,9,12,13
- * cr10, cr15
- */
- static const struct regcache_map_entry hppa_linux_gregmap[] =
- {
- { 32, HPPA_R0_REGNUM },
- { 1, HPPA_SR4_REGNUM+1 },
- { 1, HPPA_SR4_REGNUM+2 },
- { 1, HPPA_SR4_REGNUM+3 },
- { 1, HPPA_SR4_REGNUM+4 },
- { 1, HPPA_SR4_REGNUM },
- { 1, HPPA_SR4_REGNUM+5 },
- { 1, HPPA_SR4_REGNUM+6 },
- { 1, HPPA_SR4_REGNUM+7 },
- { 1, HPPA_PCOQ_HEAD_REGNUM },
- { 1, HPPA_PCOQ_TAIL_REGNUM },
- { 1, HPPA_PCSQ_HEAD_REGNUM },
- { 1, HPPA_PCSQ_TAIL_REGNUM },
- { 1, HPPA_SAR_REGNUM },
- { 1, HPPA_IIR_REGNUM },
- { 1, HPPA_ISR_REGNUM },
- { 1, HPPA_IOR_REGNUM },
- { 1, HPPA_IPSW_REGNUM },
- { 1, HPPA_RCR_REGNUM },
- { 8, HPPA_TR0_REGNUM },
- { 4, HPPA_PID0_REGNUM },
- { 1, HPPA_CCR_REGNUM },
- { 1, HPPA_EIEM_REGNUM },
- { 0 }
- };
- static const struct regcache_map_entry hppa_linux_fpregmap[] =
- {
- /* FIXME: Only works for 32-bit mode. In 64-bit mode there should
- be 32 fpregs, 8 bytes each. */
- { 64, HPPA_FP0_REGNUM, 4 },
- { 0 }
- };
- /* HPPA Linux kernel register set. */
- static const struct regset hppa_linux_regset =
- {
- hppa_linux_gregmap,
- regcache_supply_regset, regcache_collect_regset
- };
- static const struct regset hppa_linux_fpregset =
- {
- hppa_linux_fpregmap,
- regcache_supply_regset, regcache_collect_regset
- };
- static void
- hppa_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
- {
- hppa_gdbarch_tdep *tdep = (hppa_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- cb (".reg", 80 * tdep->bytes_per_address, 80 * tdep->bytes_per_address,
- &hppa_linux_regset, NULL, cb_data);
- cb (".reg2", 64 * 4, 64 * 4, &hppa_linux_fpregset, NULL, cb_data);
- }
- static void
- hppa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- hppa_gdbarch_tdep *tdep = (hppa_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- linux_init_abi (info, gdbarch, 0);
- /* GNU/Linux is always ELF. */
- tdep->is_elf = 1;
- tdep->find_global_pointer = hppa_linux_find_global_pointer;
- set_gdbarch_write_pc (gdbarch, hppa_linux_target_write_pc);
- frame_unwind_append_unwinder (gdbarch, &hppa_linux_sigtramp_frame_unwind);
- /* GNU/Linux uses SVR4-style shared libraries. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, linux_ilp32_fetch_link_map_offsets);
- tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
- set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
- /* GNU/Linux uses the dynamic linker included in the GNU C Library. */
- set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
- /* On hppa-linux, currently, sizeof(long double) == 8. There has been
- some discussions to support 128-bit long double, but it requires some
- more work in gcc and glibc first. */
- set_gdbarch_long_double_bit (gdbarch, 64);
- set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
- set_gdbarch_iterate_over_regset_sections
- (gdbarch, hppa_linux_iterate_over_regset_sections);
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, hppa_dwarf_reg_to_regnum);
- /* Enable TLS support. */
- set_gdbarch_fetch_tls_load_module_address (gdbarch,
- svr4_fetch_objfile_link_map);
- }
- void _initialize_hppa_linux_tdep ();
- void
- _initialize_hppa_linux_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_LINUX,
- hppa_linux_init_abi);
- gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w,
- GDB_OSABI_LINUX, hppa_linux_init_abi);
- }
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