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247 lines
6.9 KiB
C
247 lines
6.9 KiB
C
/* GNU/Linux/PowerPC specific low level interface, for the in-process
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agent library for GDB.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include <sys/mman.h>
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#include "tracepoint.h"
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#include "linux-ppc-tdesc.h"
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#include <elf.h>
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#ifdef HAVE_GETAUXVAL
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#include <sys/auxv.h>
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#endif
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/* These macros define the position of registers in the buffer collected
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by the fast tracepoint jump pad. */
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#define FT_CR_R0 0
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#define FT_CR_CR 32
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#define FT_CR_XER 33
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#define FT_CR_LR 34
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#define FT_CR_CTR 35
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#define FT_CR_PC 36
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#define FT_CR_GPR(n) (FT_CR_R0 + (n))
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static const int ppc_ft_collect_regmap[] = {
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/* GPRs */
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FT_CR_GPR (0), FT_CR_GPR (1), FT_CR_GPR (2),
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FT_CR_GPR (3), FT_CR_GPR (4), FT_CR_GPR (5),
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FT_CR_GPR (6), FT_CR_GPR (7), FT_CR_GPR (8),
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FT_CR_GPR (9), FT_CR_GPR (10), FT_CR_GPR (11),
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FT_CR_GPR (12), FT_CR_GPR (13), FT_CR_GPR (14),
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FT_CR_GPR (15), FT_CR_GPR (16), FT_CR_GPR (17),
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FT_CR_GPR (18), FT_CR_GPR (19), FT_CR_GPR (20),
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FT_CR_GPR (21), FT_CR_GPR (22), FT_CR_GPR (23),
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FT_CR_GPR (24), FT_CR_GPR (25), FT_CR_GPR (26),
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FT_CR_GPR (27), FT_CR_GPR (28), FT_CR_GPR (29),
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FT_CR_GPR (30), FT_CR_GPR (31),
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/* FPRs - not collected. */
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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FT_CR_PC, /* PC */
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-1, /* MSR */
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FT_CR_CR, /* CR */
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FT_CR_LR, /* LR */
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FT_CR_CTR, /* CTR */
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FT_CR_XER, /* XER */
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-1, /* FPSCR */
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};
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#define PPC_NUM_FT_COLLECT_GREGS \
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(sizeof (ppc_ft_collect_regmap) / sizeof(ppc_ft_collect_regmap[0]))
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/* Supply registers collected by the fast tracepoint jump pad.
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BUF is the second argument we pass to gdb_collect in jump pad. */
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void
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supply_fast_tracepoint_registers (struct regcache *regcache,
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const unsigned char *buf)
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{
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int i;
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for (i = 0; i < PPC_NUM_FT_COLLECT_GREGS; i++)
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{
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if (ppc_ft_collect_regmap[i] == -1)
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continue;
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supply_register (regcache, i,
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((char *) buf)
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+ ppc_ft_collect_regmap[i] * sizeof (long));
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}
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}
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/* Return the value of register REGNUM. RAW_REGS is collected buffer
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by jump pad. This function is called by emit_reg. */
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ULONGEST
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get_raw_reg (const unsigned char *raw_regs, int regnum)
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{
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if (regnum >= PPC_NUM_FT_COLLECT_GREGS)
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return 0;
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if (ppc_ft_collect_regmap[regnum] == -1)
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return 0;
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return *(unsigned long *) (raw_regs
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+ ppc_ft_collect_regmap[regnum] * sizeof (long));
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}
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/* Allocate buffer for the jump pads. The branch instruction has a reach
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of +/- 32MiB, and the executable is loaded at 0x10000000 (256MiB).
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64-bit: To maximize the area of executable that can use tracepoints,
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try allocating at 0x10000000 - size initially, decreasing until we hit
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a free area.
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32-bit: ld.so loads dynamic libraries right below the executable, so
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we cannot depend on that area (dynamic libraries can be quite large).
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Instead, aim right after the executable - at sbrk(0). This will
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cause future brk to fail, and malloc will fallback to mmap. */
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void *
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alloc_jump_pad_buffer (size_t size)
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{
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#ifdef __powerpc64__
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uintptr_t addr;
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uintptr_t exec_base = getauxval (AT_PHDR);
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int pagesize;
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void *res;
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if (exec_base == 0)
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exec_base = 0x10000000;
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pagesize = sysconf (_SC_PAGE_SIZE);
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if (pagesize == -1)
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perror_with_name ("sysconf");
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addr = exec_base - size;
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/* size should already be page-aligned, but this can't hurt. */
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addr &= ~(pagesize - 1);
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/* Search for a free area. If we hit 0, we're out of luck. */
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for (; addr; addr -= pagesize)
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{
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/* No MAP_FIXED - we don't want to zap someone's mapping. */
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res = mmap ((void *) addr, size,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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/* If we got what we wanted, return. */
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if ((uintptr_t) res == addr)
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return res;
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/* If we got a mapping, but at a wrong address, undo it. */
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if (res != MAP_FAILED)
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munmap (res, size);
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}
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return NULL;
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#else
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void *target = sbrk (0);
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void *res = mmap (target, size, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (res == target)
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return res;
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if (res != MAP_FAILED)
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munmap (res, size);
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return NULL;
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#endif
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}
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/* Return target_desc to use for IPA, given the tdesc index passed by
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gdbserver. */
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const struct target_desc *
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get_ipa_tdesc (int idx)
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{
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switch (idx)
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{
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#ifdef __powerpc64__
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case PPC_TDESC_BASE:
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return tdesc_powerpc_64l;
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case PPC_TDESC_ALTIVEC:
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return tdesc_powerpc_altivec64l;
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case PPC_TDESC_CELL:
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return tdesc_powerpc_cell64l;
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case PPC_TDESC_VSX:
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return tdesc_powerpc_vsx64l;
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case PPC_TDESC_ISA205:
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return tdesc_powerpc_isa205_64l;
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case PPC_TDESC_ISA205_ALTIVEC:
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return tdesc_powerpc_isa205_altivec64l;
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case PPC_TDESC_ISA205_VSX:
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return tdesc_powerpc_isa205_vsx64l;
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#else
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case PPC_TDESC_BASE:
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return tdesc_powerpc_32l;
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case PPC_TDESC_ALTIVEC:
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return tdesc_powerpc_altivec32l;
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case PPC_TDESC_CELL:
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return tdesc_powerpc_cell32l;
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case PPC_TDESC_VSX:
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return tdesc_powerpc_vsx32l;
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case PPC_TDESC_ISA205:
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return tdesc_powerpc_isa205_32l;
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case PPC_TDESC_ISA205_ALTIVEC:
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return tdesc_powerpc_isa205_altivec32l;
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case PPC_TDESC_ISA205_VSX:
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return tdesc_powerpc_isa205_vsx32l;
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case PPC_TDESC_E500:
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return tdesc_powerpc_e500l;
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#endif
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default:
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internal_error (__FILE__, __LINE__,
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"unknown ipa tdesc index: %d", idx);
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#ifdef __powerpc64__
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return tdesc_powerpc_64l;
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#else
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return tdesc_powerpc_32l;
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#endif
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}
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}
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/* Initialize ipa_tdesc and others. */
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void
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initialize_low_tracepoint (void)
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{
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#ifdef __powerpc64__
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init_registers_powerpc_64l ();
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init_registers_powerpc_altivec64l ();
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init_registers_powerpc_cell64l ();
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init_registers_powerpc_vsx64l ();
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init_registers_powerpc_isa205_64l ();
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init_registers_powerpc_isa205_altivec64l ();
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init_registers_powerpc_isa205_vsx64l ();
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#else
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init_registers_powerpc_32l ();
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init_registers_powerpc_altivec32l ();
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init_registers_powerpc_cell32l ();
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init_registers_powerpc_vsx32l ();
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init_registers_powerpc_isa205_32l ();
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init_registers_powerpc_isa205_altivec32l ();
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init_registers_powerpc_isa205_vsx32l ();
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init_registers_powerpc_e500l ();
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#endif
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}
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