#include "solib.h"
#include "solist.h"
#include "ppc-tdep.h"
+#include "ppc64-tdep.h"
#include "ppc-linux-tdep.h"
#include "glibc-tdep.h"
#include "trad-frame.h"
readbuf, writebuf);
}
-/* Macros for matching instructions. Note that, since all the
- operands are masked off before they're or-ed into the instruction,
- you can use -1 to make masks. */
-
-#define insn_d(opcd, rts, ra, d) \
- ((((opcd) & 0x3f) << 26) \
- | (((rts) & 0x1f) << 21) \
- | (((ra) & 0x1f) << 16) \
- | ((d) & 0xffff))
-
-#define insn_ds(opcd, rts, ra, d, xo) \
- ((((opcd) & 0x3f) << 26) \
- | (((rts) & 0x1f) << 21) \
- | (((ra) & 0x1f) << 16) \
- | ((d) & 0xfffc) \
- | ((xo) & 0x3))
-
-#define insn_xfx(opcd, rts, spr, xo) \
- ((((opcd) & 0x3f) << 26) \
- | (((rts) & 0x1f) << 21) \
- | (((spr) & 0x1f) << 16) \
- | (((spr) & 0x3e0) << 6) \
- | (((xo) & 0x3ff) << 1))
-
-/* Read a PPC instruction from memory. PPC instructions are always
- big-endian, no matter what endianness the program is running in, so
- we can't use read_memory_integer or one of its friends here. */
-static unsigned int
-read_insn (CORE_ADDR pc)
-{
- unsigned char buf[4];
-
- read_memory (pc, buf, 4);
- return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
-}
-
-
-/* An instruction to match. */
-struct insn_pattern
-{
- unsigned int mask; /* mask the insn with this... */
- unsigned int data; /* ...and see if it matches this. */
- int optional; /* If non-zero, this insn may be absent. */
-};
-
-/* 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. If PATTERN[i] is optional, and the instruction wasn't
- present, set INSN[i] to 0 (which is not a valid PPC instruction).
- INSN should have as many elements as PATTERN. Note that, if
- PATTERN contains optional instructions which aren't present in
- memory, then INSN will have holes, so INSN[i] isn't necessarily the
- i'th instruction in memory. */
-static int
-insns_match_pattern (CORE_ADDR pc,
- struct insn_pattern *pattern,
- unsigned int *insn)
-{
- int i;
-
- for (i = 0; pattern[i].mask; i++)
- {
- insn[i] = read_insn (pc);
- if ((insn[i] & pattern[i].mask) == pattern[i].data)
- pc += 4;
- else if (pattern[i].optional)
- insn[i] = 0;
- else
- return 0;
- }
-
- return 1;
-}
-
-
-/* Return the 'd' field of the d-form instruction INSN, properly
- sign-extended. */
-static CORE_ADDR
-insn_d_field (unsigned int insn)
-{
- return ((((CORE_ADDR) insn & 0xffff) ^ 0x8000) - 0x8000);
-}
-
-
-/* Return the 'ds' field of the ds-form instruction INSN, with the two
- zero bits concatenated at the right, and properly
- sign-extended. */
-static CORE_ADDR
-insn_ds_field (unsigned int insn)
-{
- return ((((CORE_ADDR) insn & 0xfffc) ^ 0x8000) - 0x8000);
-}
-
-
-/* If DESC is the address of a 64-bit PowerPC GNU/Linux function
- descriptor, return the descriptor's entry point. */
-static CORE_ADDR
-ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc)
-{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- /* The first word of the descriptor is the entry point. */
- return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order);
-}
-
-
-/* Pattern for the standard linkage function. These are built by
- build_plt_stub in elf64-ppc.c, whose GLINK argument is always
- zero. */
-static struct insn_pattern ppc64_standard_linkage1[] =
- {
- /* addis r12, r2, <any> */
- { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
-
- /* std r2, 40(r1) */
- { -1, insn_ds (62, 2, 1, 40, 0), 0 },
-
- /* ld r11, <any>(r12) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
-
- /* addis r12, r12, 1 <optional> */
- { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
-
- /* ld r2, <any>(r12) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
-
- /* addis r12, r12, 1 <optional> */
- { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 },
-
- /* mtctr r11 */
- { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
-
- /* ld r11, <any>(r12) <optional> */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
-
- /* bctr */
- { -1, 0x4e800420, 0 },
-
- { 0, 0, 0 }
- };
-#define PPC64_STANDARD_LINKAGE1_LEN \
- (sizeof (ppc64_standard_linkage1) / sizeof (ppc64_standard_linkage1[0]))
-
-static struct insn_pattern ppc64_standard_linkage2[] =
- {
- /* addis r12, r2, <any> */
- { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 },
-
- /* std r2, 40(r1) */
- { -1, insn_ds (62, 2, 1, 40, 0), 0 },
-
- /* ld r11, <any>(r12) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 },
-
- /* addi r12, r12, <any> <optional> */
- { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 },
-
- /* mtctr r11 */
- { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
-
- /* ld r2, <any>(r12) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 },
-
- /* ld r11, <any>(r12) <optional> */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 },
-
- /* bctr */
- { -1, 0x4e800420, 0 },
-
- { 0, 0, 0 }
- };
-#define PPC64_STANDARD_LINKAGE2_LEN \
- (sizeof (ppc64_standard_linkage2) / sizeof (ppc64_standard_linkage2[0]))
-
-static struct insn_pattern ppc64_standard_linkage3[] =
- {
- /* std r2, 40(r1) */
- { -1, insn_ds (62, 2, 1, 40, 0), 0 },
-
- /* ld r11, <any>(r2) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 },
-
- /* addi r2, r2, <any> <optional> */
- { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 },
-
- /* mtctr r11 */
- { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 },
-
- /* ld r11, <any>(r2) <optional> */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 },
-
- /* ld r2, <any>(r2) */
- { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 },
-
- /* bctr */
- { -1, 0x4e800420, 0 },
-
- { 0, 0, 0 }
- };
-#define PPC64_STANDARD_LINKAGE3_LEN \
- (sizeof (ppc64_standard_linkage3) / sizeof (ppc64_standard_linkage3[0]))
-
-
-/* When the dynamic linker is doing lazy symbol resolution, the first
- call to a function in another object will go like this:
-
- - The user's function calls the linkage function:
-
- 100007c4: 4b ff fc d5 bl 10000498
- 100007c8: e8 41 00 28 ld r2,40(r1)
-
- - The linkage function loads the entry point (and other stuff) from
- the function descriptor in the PLT, and jumps to it:
-
- 10000498: 3d 82 00 00 addis r12,r2,0
- 1000049c: f8 41 00 28 std r2,40(r1)
- 100004a0: e9 6c 80 98 ld r11,-32616(r12)
- 100004a4: e8 4c 80 a0 ld r2,-32608(r12)
- 100004a8: 7d 69 03 a6 mtctr r11
- 100004ac: e9 6c 80 a8 ld r11,-32600(r12)
- 100004b0: 4e 80 04 20 bctr
-
- - But since this is the first time that PLT entry has been used, it
- sends control to its glink entry. That loads the number of the
- PLT entry and jumps to the common glink0 code:
-
- 10000c98: 38 00 00 00 li r0,0
- 10000c9c: 4b ff ff dc b 10000c78
-
- - The common glink0 code then transfers control to the dynamic
- linker's fixup code:
-
- 10000c78: e8 41 00 28 ld r2,40(r1)
- 10000c7c: 3d 82 00 00 addis r12,r2,0
- 10000c80: e9 6c 80 80 ld r11,-32640(r12)
- 10000c84: e8 4c 80 88 ld r2,-32632(r12)
- 10000c88: 7d 69 03 a6 mtctr r11
- 10000c8c: e9 6c 80 90 ld r11,-32624(r12)
- 10000c90: 4e 80 04 20 bctr
-
- Eventually, this code will figure out how to skip all of this,
- including the dynamic linker. At the moment, we just get through
- the linkage function. */
-
-/* If the current thread is about to execute a series of instructions
- at PC matching the ppc64_standard_linkage pattern, and INSN is the result
- from that pattern match, return the code address to which the
- standard linkage function will send them. (This doesn't deal with
- dynamic linker lazy symbol resolution stubs.) */
-static CORE_ADDR
-ppc64_standard_linkage1_target (struct frame_info *frame,
- CORE_ADDR pc, unsigned int *insn)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
- /* The address of the function descriptor this linkage function
- references. */
- CORE_ADDR desc
- = ((CORE_ADDR) get_frame_register_unsigned (frame,
- tdep->ppc_gp0_regnum + 2)
- + (insn_d_field (insn[0]) << 16)
- + insn_ds_field (insn[2]));
-
- /* The first word of the descriptor is the entry point. Return that. */
- return ppc64_desc_entry_point (gdbarch, desc);
-}
-
static struct core_regset_section ppc_linux_vsx_regset_sections[] =
{
{ ".reg", 48 * 4, "general-purpose" },
{ NULL, 0}
};
-static CORE_ADDR
-ppc64_standard_linkage2_target (struct frame_info *frame,
- CORE_ADDR pc, unsigned int *insn)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
- /* The address of the function descriptor this linkage function
- references. */
- CORE_ADDR desc
- = ((CORE_ADDR) get_frame_register_unsigned (frame,
- tdep->ppc_gp0_regnum + 2)
- + (insn_d_field (insn[0]) << 16)
- + insn_ds_field (insn[2]));
-
- /* The first word of the descriptor is the entry point. Return that. */
- return ppc64_desc_entry_point (gdbarch, desc);
-}
-
-static CORE_ADDR
-ppc64_standard_linkage3_target (struct frame_info *frame,
- CORE_ADDR pc, unsigned int *insn)
-{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
-
- /* The address of the function descriptor this linkage function
- references. */
- CORE_ADDR desc
- = ((CORE_ADDR) get_frame_register_unsigned (frame,
- tdep->ppc_gp0_regnum + 2)
- + insn_ds_field (insn[1]));
-
- /* The first word of the descriptor is the entry point. Return that. */
- return ppc64_desc_entry_point (gdbarch, desc);
-}
-
/* PLT stub in executable. */
-static struct insn_pattern powerpc32_plt_stub[] =
+static struct ppc_insn_pattern powerpc32_plt_stub[] =
{
{ 0xffff0000, 0x3d600000, 0 }, /* lis r11, xxxx */
{ 0xffff0000, 0x816b0000, 0 }, /* lwz r11, xxxx(r11) */
};
/* PLT stub in shared library. */
-static struct insn_pattern powerpc32_plt_stub_so[] =
+static struct ppc_insn_pattern powerpc32_plt_stub_so[] =
{
{ 0xffff0000, 0x817e0000, 0 }, /* lwz r11, xxxx(r30) */
{ 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR target = 0;
- if (insns_match_pattern (pc, powerpc32_plt_stub, insnbuf))
+ if (ppc_insns_match_pattern (pc, powerpc32_plt_stub, insnbuf))
{
/* Insn pattern is
lis r11, xxxx
lwz r11, xxxx(r11)
Branch target is in r11. */
- target = (insn_d_field (insnbuf[0]) << 16) | insn_d_field (insnbuf[1]);
+ target = (ppc_insn_d_field (insnbuf[0]) << 16)
+ | ppc_insn_d_field (insnbuf[1]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
- if (insns_match_pattern (pc, powerpc32_plt_stub_so, insnbuf))
+ if (ppc_insns_match_pattern (pc, powerpc32_plt_stub_so, insnbuf))
{
/* Insn pattern is
lwz r11, xxxx(r30)
Branch target is in r11. */
target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30)
- + insn_d_field (insnbuf[0]);
+ + ppc_insn_d_field (insnbuf[0]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
return target;
}
-/* Given that we've begun executing a call trampoline at PC, return
- the entry point of the function the trampoline will go to. */
-static CORE_ADDR
-ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
-{
- unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN];
- unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN];
- unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN];
- CORE_ADDR target;
-
- if (insns_match_pattern (pc, ppc64_standard_linkage1,
- ppc64_standard_linkage1_insn))
- pc = ppc64_standard_linkage1_target (frame, pc,
- ppc64_standard_linkage1_insn);
- else if (insns_match_pattern (pc, ppc64_standard_linkage2,
- ppc64_standard_linkage2_insn))
- pc = ppc64_standard_linkage2_target (frame, pc,
- ppc64_standard_linkage2_insn);
- else if (insns_match_pattern (pc, ppc64_standard_linkage3,
- ppc64_standard_linkage3_insn))
- pc = ppc64_standard_linkage3_target (frame, pc,
- ppc64_standard_linkage3_insn);
- else
- return 0;
-
- /* The PLT descriptor will either point to the already resolved target
- address, or else to a glink stub. As the latter carry synthetic @plt
- symbols, find_solib_trampoline_target should be able to resolve them. */
- target = find_solib_trampoline_target (frame, pc);
- return target? target : pc;
-}
-
-
-/* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64
- GNU/Linux.
-
- Usually a function pointer's representation is simply the address
- of the function. On GNU/Linux on the PowerPC however, a function
- pointer may be a pointer to a function descriptor.
-
- For PPC64, a function descriptor is a TOC entry, in a data section,
- which contains three words: the first word is the address of the
- function, the second word is the TOC pointer (r2), and the third word
- is the static chain value.
-
- Throughout GDB it is currently assumed that a function pointer contains
- the address of the function, which is not easy to fix. In addition, the
- conversion of a function address to a function pointer would
- require allocation of a TOC entry in the inferior's memory space,
- with all its drawbacks. To be able to call C++ virtual methods in
- the inferior (which are called via function pointers),
- find_function_addr uses this function to get the function address
- from a function pointer.
-
- If ADDR points at what is clearly a function descriptor, transform
- it into the address of the corresponding function, if needed. Be
- conservative, otherwise GDB will do the transformation on any
- random addresses such as occur when there is no symbol table. */
-
-static CORE_ADDR
-ppc64_linux_convert_from_func_ptr_addr (struct gdbarch *gdbarch,
- CORE_ADDR addr,
- struct target_ops *targ)
-{
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct target_section *s = target_section_by_addr (targ, addr);
-
- /* Check if ADDR points to a function descriptor. */
- if (s && strcmp (s->the_bfd_section->name, ".opd") == 0)
- {
- /* There may be relocations that need to be applied to the .opd
- section. Unfortunately, this function may be called at a time
- where these relocations have not yet been performed -- this can
- happen for example shortly after a library has been loaded with
- dlopen, but ld.so has not yet applied the relocations.
-
- To cope with both the case where the relocation has been applied,
- and the case where it has not yet been applied, we do *not* read
- the (maybe) relocated value from target memory, but we instead
- read the non-relocated value from the BFD, and apply the relocation
- offset manually.
-
- This makes the assumption that all .opd entries are always relocated
- by the same offset the section itself was relocated. This should
- always be the case for GNU/Linux executables and shared libraries.
- Note that other kind of object files (e.g. those added via
- add-symbol-files) will currently never end up here anyway, as this
- function accesses *target* sections only; only the main exec and
- shared libraries are ever added to the target. */
-
- gdb_byte buf[8];
- int res;
-
- res = bfd_get_section_contents (s->bfd, s->the_bfd_section,
- &buf, addr - s->addr, 8);
- if (res != 0)
- return extract_unsigned_integer (buf, 8, byte_order)
- - bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr;
- }
-
- return addr;
-}
-
/* Wrappers to handle Linux-only registers. */
static void
/* Handle PPC GNU/Linux 64-bit function pointers (which are really
function descriptors). */
set_gdbarch_convert_from_func_ptr_addr
- (gdbarch, ppc64_linux_convert_from_func_ptr_addr);
+ (gdbarch, ppc64_convert_from_func_ptr_addr);
/* Shared library handling. */
set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code);
projects / binutils-gdb.git / commitdiff