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- /* GNU/Linux/PowerPC specific low level interface, for the in-process
- agent library for GDB.
- Copyright (C) 2016-2022 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 "server.h"
- #include <sys/mman.h>
- #include "tracepoint.h"
- #include "arch/ppc-linux-tdesc.h"
- #include "linux-ppc-tdesc-init.h"
- #include <elf.h>
- #ifdef HAVE_GETAUXVAL
- #include <sys/auxv.h>
- #endif
- /* These macros define the position of registers in the buffer collected
- by the fast tracepoint jump pad. */
- #define FT_CR_R0 0
- #define FT_CR_CR 32
- #define FT_CR_XER 33
- #define FT_CR_LR 34
- #define FT_CR_CTR 35
- #define FT_CR_PC 36
- #define FT_CR_GPR(n) (FT_CR_R0 + (n))
- static const int ppc_ft_collect_regmap[] = {
- /* GPRs */
- FT_CR_GPR (0), FT_CR_GPR (1), FT_CR_GPR (2),
- FT_CR_GPR (3), FT_CR_GPR (4), FT_CR_GPR (5),
- FT_CR_GPR (6), FT_CR_GPR (7), FT_CR_GPR (8),
- FT_CR_GPR (9), FT_CR_GPR (10), FT_CR_GPR (11),
- FT_CR_GPR (12), FT_CR_GPR (13), FT_CR_GPR (14),
- FT_CR_GPR (15), FT_CR_GPR (16), FT_CR_GPR (17),
- FT_CR_GPR (18), FT_CR_GPR (19), FT_CR_GPR (20),
- FT_CR_GPR (21), FT_CR_GPR (22), FT_CR_GPR (23),
- FT_CR_GPR (24), FT_CR_GPR (25), FT_CR_GPR (26),
- FT_CR_GPR (27), FT_CR_GPR (28), FT_CR_GPR (29),
- FT_CR_GPR (30), FT_CR_GPR (31),
- /* FPRs - not collected. */
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- FT_CR_PC, /* PC */
- -1, /* MSR */
- FT_CR_CR, /* CR */
- FT_CR_LR, /* LR */
- FT_CR_CTR, /* CTR */
- FT_CR_XER, /* XER */
- -1, /* FPSCR */
- };
- #define PPC_NUM_FT_COLLECT_GREGS \
- (sizeof (ppc_ft_collect_regmap) / sizeof(ppc_ft_collect_regmap[0]))
- /* Supply registers collected by the fast tracepoint jump pad.
- BUF is the second argument we pass to gdb_collect in jump pad. */
- void
- supply_fast_tracepoint_registers (struct regcache *regcache,
- const unsigned char *buf)
- {
- int i;
- for (i = 0; i < PPC_NUM_FT_COLLECT_GREGS; i++)
- {
- if (ppc_ft_collect_regmap[i] == -1)
- continue;
- supply_register (regcache, i,
- ((char *) buf)
- + ppc_ft_collect_regmap[i] * sizeof (long));
- }
- }
- /* Return the value of register REGNUM. RAW_REGS is collected buffer
- by jump pad. This function is called by emit_reg. */
- ULONGEST
- get_raw_reg (const unsigned char *raw_regs, int regnum)
- {
- if (regnum >= PPC_NUM_FT_COLLECT_GREGS)
- return 0;
- if (ppc_ft_collect_regmap[regnum] == -1)
- return 0;
- return *(unsigned long *) (raw_regs
- + ppc_ft_collect_regmap[regnum] * sizeof (long));
- }
- /* Allocate buffer for the jump pads. The branch instruction has a reach
- of +/- 32MiB, and the executable is loaded at 0x10000000 (256MiB).
- 64-bit: To maximize the area of executable that can use tracepoints,
- try allocating at 0x10000000 - size initially, decreasing until we hit
- a free area.
- 32-bit: ld.so loads dynamic libraries right below the executable, so
- we cannot depend on that area (dynamic libraries can be quite large).
- Instead, aim right after the executable - at sbrk(0). This will
- cause future brk to fail, and malloc will fallback to mmap. */
- void *
- alloc_jump_pad_buffer (size_t size)
- {
- #ifdef __powerpc64__
- uintptr_t addr;
- uintptr_t exec_base = getauxval (AT_PHDR);
- int pagesize;
- void *res;
- if (exec_base == 0)
- exec_base = 0x10000000;
- pagesize = sysconf (_SC_PAGE_SIZE);
- if (pagesize == -1)
- perror_with_name ("sysconf");
- addr = exec_base - size;
- /* size should already be page-aligned, but this can't hurt. */
- addr &= ~(pagesize - 1);
- /* Search for a free area. If we hit 0, we're out of luck. */
- for (; addr; addr -= pagesize)
- {
- /* No MAP_FIXED - we don't want to zap someone's mapping. */
- res = mmap ((void *) addr, size,
- PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- /* If we got what we wanted, return. */
- if ((uintptr_t) res == addr)
- return res;
- /* If we got a mapping, but at a wrong address, undo it. */
- if (res != MAP_FAILED)
- munmap (res, size);
- }
- return NULL;
- #else
- void *target = sbrk (0);
- void *res = mmap (target, size, PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (res == target)
- return res;
- if (res != MAP_FAILED)
- munmap (res, size);
- return NULL;
- #endif
- }
- /* Return target_desc to use for IPA, given the tdesc index passed by
- gdbserver. */
- const struct target_desc *
- get_ipa_tdesc (int idx)
- {
- switch (idx)
- {
- #ifdef __powerpc64__
- case PPC_TDESC_BASE:
- return tdesc_powerpc_64l;
- case PPC_TDESC_ALTIVEC:
- return tdesc_powerpc_altivec64l;
- case PPC_TDESC_VSX:
- return tdesc_powerpc_vsx64l;
- case PPC_TDESC_ISA205:
- return tdesc_powerpc_isa205_64l;
- case PPC_TDESC_ISA205_ALTIVEC:
- return tdesc_powerpc_isa205_altivec64l;
- case PPC_TDESC_ISA205_VSX:
- return tdesc_powerpc_isa205_vsx64l;
- case PPC_TDESC_ISA205_PPR_DSCR_VSX:
- return tdesc_powerpc_isa205_ppr_dscr_vsx64l;
- case PPC_TDESC_ISA207_VSX:
- return tdesc_powerpc_isa207_vsx64l;
- case PPC_TDESC_ISA207_HTM_VSX:
- return tdesc_powerpc_isa207_htm_vsx64l;
- #else
- case PPC_TDESC_BASE:
- return tdesc_powerpc_32l;
- case PPC_TDESC_ALTIVEC:
- return tdesc_powerpc_altivec32l;
- case PPC_TDESC_VSX:
- return tdesc_powerpc_vsx32l;
- case PPC_TDESC_ISA205:
- return tdesc_powerpc_isa205_32l;
- case PPC_TDESC_ISA205_ALTIVEC:
- return tdesc_powerpc_isa205_altivec32l;
- case PPC_TDESC_ISA205_VSX:
- return tdesc_powerpc_isa205_vsx32l;
- case PPC_TDESC_ISA205_PPR_DSCR_VSX:
- return tdesc_powerpc_isa205_ppr_dscr_vsx32l;
- case PPC_TDESC_ISA207_VSX:
- return tdesc_powerpc_isa207_vsx32l;
- case PPC_TDESC_ISA207_HTM_VSX:
- return tdesc_powerpc_isa207_htm_vsx32l;
- case PPC_TDESC_E500:
- return tdesc_powerpc_e500l;
- #endif
- default:
- internal_error (__FILE__, __LINE__,
- "unknown ipa tdesc index: %d", idx);
- #ifdef __powerpc64__
- return tdesc_powerpc_64l;
- #else
- return tdesc_powerpc_32l;
- #endif
- }
- }
- /* Initialize ipa_tdesc and others. */
- void
- initialize_low_tracepoint (void)
- {
- #ifdef __powerpc64__
- init_registers_powerpc_64l ();
- init_registers_powerpc_altivec64l ();
- init_registers_powerpc_vsx64l ();
- init_registers_powerpc_isa205_64l ();
- init_registers_powerpc_isa205_altivec64l ();
- init_registers_powerpc_isa205_vsx64l ();
- init_registers_powerpc_isa205_ppr_dscr_vsx64l ();
- init_registers_powerpc_isa207_vsx64l ();
- init_registers_powerpc_isa207_htm_vsx64l ();
- #else
- init_registers_powerpc_32l ();
- init_registers_powerpc_altivec32l ();
- init_registers_powerpc_vsx32l ();
- init_registers_powerpc_isa205_32l ();
- init_registers_powerpc_isa205_altivec32l ();
- init_registers_powerpc_isa205_vsx32l ();
- init_registers_powerpc_isa205_ppr_dscr_vsx32l ();
- init_registers_powerpc_isa207_vsx32l ();
- init_registers_powerpc_isa207_htm_vsx32l ();
- init_registers_powerpc_e500l ();
- #endif
- }
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