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Diffstat (limited to 'gdb/rs6000-tdep.c')
-rw-r--r--gdb/rs6000-tdep.c186
1 files changed, 149 insertions, 37 deletions
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index fbcc204..2c9e134 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -35,15 +35,9 @@
#include "coff/internal.h" /* for libcoff.h */
#include "bfd/libcoff.h" /* for xcoff_data */
-/* Some important register numbers. Keep these in the same order as in
- /usr/mstsave.h `mstsave' structure, for easier processing. */
+#include "elf-bfd.h"
-#define GP0_REGNUM 0 /* GPR register 0 */
-#define TOC_REGNUM 2 /* TOC register */
-#define PS_REGNUM 65 /* Processor (or machine) status (%msr) */
-#define CR_REGNUM 66 /* Condition register */
-#define LR_REGNUM 67 /* Link register */
-#define CTR_REGNUM 68 /* Count register */
+#include "ppc-tdep.h"
/* If the kernel has to deliver a signal, it pushes a sigcontext
structure on the stack and then calls the signal handler, passing
@@ -89,6 +83,7 @@ struct reg
struct gdbarch_tdep
{
int wordsize; /* size in bytes of fixed-point word */
+ int osabi; /* OS / ABI from ELF header */
int *regoff; /* byte offsets in register arrays */
const struct reg *regs; /* from current variant */
};
@@ -157,7 +152,7 @@ struct frame_extra_info
CORE_ADDR initial_sp; /* initial stack pointer. */
};
-static void
+void
rs6000_init_extra_frame_info (int fromleaf, struct frame_info *fi)
{
fi->extra_info = (struct frame_extra_info *)
@@ -182,7 +177,7 @@ rs6000_init_extra_frame_info (int fromleaf, struct frame_info *fi)
not sure if it will be needed. The following function takes care of gpr's
and fpr's only. */
-static void
+void
rs6000_frame_init_saved_regs (struct frame_info *fi)
{
frame_get_saved_regs (fi, NULL);
@@ -205,7 +200,7 @@ rs6000_frame_args_address (struct frame_info *fi)
static CORE_ADDR
rs6000_saved_pc_after_call (struct frame_info *fi)
{
- return read_register (LR_REGNUM);
+ return read_register (PPC_LR_REGNUM);
}
/* Calculate the destination of a branch/jump. Return -1 if not a branch. */
@@ -243,7 +238,7 @@ branch_dest (int opcode, int instr, CORE_ADDR pc, CORE_ADDR safety)
if (ext_op == 16) /* br conditional register */
{
- dest = read_register (LR_REGNUM) & ~3;
+ dest = read_register (PPC_LR_REGNUM) & ~3;
/* If we are about to return from a signal handler, dest is
something like 0x3c90. The current frame is a signal handler
@@ -262,13 +257,13 @@ branch_dest (int opcode, int instr, CORE_ADDR pc, CORE_ADDR safety)
else if (ext_op == 528) /* br cond to count reg */
{
- dest = read_register (CTR_REGNUM) & ~3;
+ dest = read_register (PPC_CTR_REGNUM) & ~3;
/* If we are about to execute a system call, dest is something
like 0x22fc or 0x3b00. Upon completion the system call
will return to the address in the link register. */
if (dest < TEXT_SEGMENT_BASE)
- dest = read_register (LR_REGNUM) & ~3;
+ dest = read_register (PPC_LR_REGNUM) & ~3;
}
else
return -1;
@@ -715,7 +710,7 @@ rs6000_pop_frame (void)
else
prev_sp = read_memory_addr (sp, wordsize);
if (fdata.lr_offset == 0)
- lr = read_register (LR_REGNUM);
+ lr = read_register (PPC_LR_REGNUM);
else
lr = read_memory_addr (prev_sp + fdata.lr_offset, wordsize);
@@ -766,7 +761,7 @@ rs6000_fix_call_dummy (char *dummyname, CORE_ADDR pc, CORE_ADDR fun,
if (rs6000_find_toc_address_hook != NULL)
{
CORE_ADDR tocvalue = (*rs6000_find_toc_address_hook) (fun);
- write_register (TOC_REGNUM, tocvalue);
+ write_register (PPC_TOC_REGNUM, tocvalue);
}
}
@@ -989,7 +984,7 @@ ran_out_of_registers_for_arguments:
static CORE_ADDR
ppc_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
{
- write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ());
+ write_register (PPC_LR_REGNUM, CALL_DUMMY_ADDRESS ());
return sp;
}
@@ -1085,7 +1080,7 @@ rs6000_skip_trampoline_code (CORE_ADDR pc)
/* Determines whether the function FI has a frame on the stack or not. */
-static int
+int
rs6000_frameless_function_invocation (struct frame_info *fi)
{
CORE_ADDR func_start;
@@ -1119,7 +1114,7 @@ rs6000_frameless_function_invocation (struct frame_info *fi)
/* Return the PC saved in a frame */
-static CORE_ADDR
+CORE_ADDR
rs6000_frame_saved_pc (struct frame_info *fi)
{
CORE_ADDR func_start;
@@ -1152,7 +1147,7 @@ rs6000_frame_saved_pc (struct frame_info *fi)
}
if (fdata.lr_offset == 0)
- return read_register (LR_REGNUM);
+ return read_register (PPC_LR_REGNUM);
return read_memory_addr (FRAME_CHAIN (fi) + fdata.lr_offset, wordsize);
}
@@ -1223,12 +1218,12 @@ frame_get_saved_regs (struct frame_info *fi, struct rs6000_framedata *fdatap)
/* If != 0, fdatap->cr_offset is the offset from the frame that holds
the CR. */
if (fdatap->cr_offset != 0)
- fi->saved_regs[CR_REGNUM] = frame_addr + fdatap->cr_offset;
+ fi->saved_regs[PPC_CR_REGNUM] = frame_addr + fdatap->cr_offset;
/* If != 0, fdatap->lr_offset is the offset from the frame that holds
the LR. */
if (fdatap->lr_offset != 0)
- fi->saved_regs[LR_REGNUM] = frame_addr + fdatap->lr_offset;
+ fi->saved_regs[PPC_LR_REGNUM] = frame_addr + fdatap->lr_offset;
}
/* Return the address of a frame. This is the inital %sp value when the frame
@@ -1313,7 +1308,7 @@ frame_initial_stack_address (struct frame_info *fi)
/* In the case of the RS/6000, the frame's nominal address
is the address of a 4-byte word containing the calling frame's address. */
-static CORE_ADDR
+CORE_ADDR
rs6000_frame_chain (struct frame_info *thisframe)
{
CORE_ADDR fp, fpp, lr;
@@ -1338,7 +1333,7 @@ rs6000_frame_chain (struct frame_info *thisframe)
else
fp = read_memory_addr ((thisframe)->frame, wordsize);
- lr = read_register (LR_REGNUM);
+ lr = read_register (PPC_LR_REGNUM);
if (lr == entry_point_address ())
if (fp != 0 && (fpp = read_memory_addr (fp, wordsize)) != 0)
if (PC_IN_CALL_DUMMY (lr, fpp, fpp))
@@ -1500,7 +1495,7 @@ rs6000_store_return_value (struct type *type, char *valbuf)
TYPE_LENGTH (type));
else
/* Everything else is returned in GPR3 and up. */
- write_register_bytes (REGISTER_BYTE (GP0_REGNUM + 3), valbuf,
+ write_register_bytes (REGISTER_BYTE (PPC_GP0_REGNUM + 3), valbuf,
TYPE_LENGTH (type));
}
@@ -1909,6 +1904,84 @@ find_variant_by_arch (enum bfd_architecture arch, unsigned long mach)
return NULL;
}
+
+
+
+static void
+process_note_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
+{
+ int *os_ident_ptr = obj;
+ const char *name;
+ unsigned int sectsize;
+
+ name = bfd_get_section_name (abfd, sect);
+ sectsize = bfd_section_size (abfd, sect);
+ if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0)
+ {
+ unsigned int name_length, data_length, note_type;
+ char *note = alloca (sectsize);
+
+ bfd_get_section_contents (abfd, sect, note,
+ (file_ptr) 0, (bfd_size_type) sectsize);
+
+ name_length = bfd_h_get_32 (abfd, note);
+ data_length = bfd_h_get_32 (abfd, note + 4);
+ note_type = bfd_h_get_32 (abfd, note + 8);
+
+ if (name_length == 4 && data_length == 16 && note_type == 1
+ && strcmp (note + 12, "GNU") == 0)
+ {
+ int os_number = bfd_h_get_32 (abfd, note + 16);
+
+ /* The case numbers are from abi-tags in glibc */
+ switch (os_number)
+ {
+ case 0 :
+ *os_ident_ptr = ELFOSABI_LINUX;
+ break;
+ case 1 :
+ *os_ident_ptr = ELFOSABI_HURD;
+ break;
+ case 2 :
+ *os_ident_ptr = ELFOSABI_SOLARIS;
+ break;
+ default :
+ internal_error (
+ "process_note_abi_sections: unknown OS number %d", os_number);
+ break;
+ }
+ }
+ }
+}
+
+/* Return one of the ELFOSABI_ constants for BFDs representing ELF
+ executables. If it's not an ELF executable or if the OS/ABI couldn't
+ be determined, simply return -1. */
+
+static int
+get_elfosabi (bfd *abfd)
+{
+ int elfosabi = -1;
+
+ if (abfd != NULL && bfd_get_flavour (abfd) == bfd_target_elf_flavour)
+ {
+ elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
+
+ /* When elfosabi is 0 (ELFOSABI_NONE), this is supposed to indicate
+ that we're on a SYSV system. However, GNU/Linux uses a note section
+ to record OS/ABI info, but leaves e_ident[EI_OSABI] zero. So we
+ have to check the note sections too. */
+ if (elfosabi == 0)
+ {
+ bfd_map_over_sections (abfd,
+ process_note_abi_tag_sections,
+ &elfosabi);
+ }
+ }
+
+ return elfosabi;
+}
+
/* Initialize the current architecture based on INFO. If possible, re-use an
@@ -1923,25 +1996,40 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
- int wordsize, fromexec, power, i, off;
+ int wordsize, from_xcoff_exec, from_elf_exec, power, i, off;
struct reg *regs;
const struct variant *v;
enum bfd_architecture arch;
unsigned long mach;
bfd abfd;
+ int osabi, sysv_abi;
- fromexec = info.abfd && info.abfd->format == bfd_object &&
+ from_xcoff_exec = info.abfd && info.abfd->format == bfd_object &&
bfd_get_flavour (info.abfd) == bfd_target_xcoff_flavour;
+ from_elf_exec = info.abfd && info.abfd->format == bfd_object &&
+ bfd_get_flavour (info.abfd) == bfd_target_elf_flavour;
+
+ sysv_abi = info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour;
+
+ osabi = get_elfosabi (info.abfd);
+
/* Check word size. If INFO is from a binary file, infer it from that,
else use the previously-inferred size. */
- if (fromexec)
+ if (from_xcoff_exec)
{
if (xcoff_data (info.abfd)->xcoff64)
wordsize = 8;
else
wordsize = 4;
}
+ else if (from_elf_exec)
+ {
+ if (elf_elfheader (info.abfd)->e_ident[EI_CLASS] == ELFCLASS64)
+ wordsize = 8;
+ else
+ wordsize = 4;
+ }
else
{
tdep = TDEP;
@@ -1960,7 +2048,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
meaningful, because 64-bit CPUs can run in 32-bit mode. So, perform
separate word size check. */
tdep = gdbarch_tdep (arches->gdbarch);
- if (tdep && tdep->wordsize == wordsize)
+ if (tdep && tdep->wordsize == wordsize && tdep->osabi == osabi)
return arches->gdbarch;
}
@@ -1972,7 +2060,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
- "set arch" trust blindly
- GDB startup useless but harmless */
- if (!fromexec)
+ if (!from_xcoff_exec)
{
arch = info.bfd_architecture;
mach = info.bfd_arch_info->mach;
@@ -1986,6 +2074,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
}
tdep = xmalloc (sizeof (struct gdbarch_tdep));
tdep->wordsize = wordsize;
+ tdep->osabi = osabi;
gdbarch = gdbarch_alloc (&info, tdep);
power = arch == bfd_arch_rs6000;
@@ -2060,16 +2149,17 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_register_convert_to_raw (gdbarch, rs6000_register_convert_to_raw);
set_gdbarch_extract_return_value (gdbarch, rs6000_extract_return_value);
- set_gdbarch_push_arguments (gdbarch, rs6000_push_arguments);
+
+ if (sysv_abi)
+ set_gdbarch_push_arguments (gdbarch, ppc_sysv_abi_push_arguments);
+ else
+ set_gdbarch_push_arguments (gdbarch, rs6000_push_arguments);
set_gdbarch_store_struct_return (gdbarch, rs6000_store_struct_return);
set_gdbarch_store_return_value (gdbarch, rs6000_store_return_value);
set_gdbarch_extract_struct_value_address (gdbarch, rs6000_extract_struct_value_address);
set_gdbarch_use_struct_convention (gdbarch, generic_use_struct_convention);
- set_gdbarch_frame_init_saved_regs (gdbarch, rs6000_frame_init_saved_regs);
- set_gdbarch_init_extra_frame_info (gdbarch, rs6000_init_extra_frame_info);
-
set_gdbarch_pop_frame (gdbarch, rs6000_pop_frame);
set_gdbarch_skip_prologue (gdbarch, rs6000_skip_prologue);
@@ -2081,10 +2171,32 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Not sure on this. FIXMEmgo */
set_gdbarch_frame_args_skip (gdbarch, 8);
- set_gdbarch_frameless_function_invocation (gdbarch, rs6000_frameless_function_invocation);
- set_gdbarch_frame_chain (gdbarch, rs6000_frame_chain);
set_gdbarch_frame_chain_valid (gdbarch, file_frame_chain_valid);
- set_gdbarch_frame_saved_pc (gdbarch, rs6000_frame_saved_pc);
+ if (osabi == ELFOSABI_LINUX)
+ {
+ set_gdbarch_frameless_function_invocation (gdbarch,
+ ppc_linux_frameless_function_invocation);
+ set_gdbarch_frame_chain (gdbarch, ppc_linux_frame_chain);
+ set_gdbarch_frame_saved_pc (gdbarch, ppc_linux_frame_saved_pc);
+
+ set_gdbarch_frame_init_saved_regs (gdbarch,
+ ppc_linux_frame_init_saved_regs);
+ set_gdbarch_init_extra_frame_info (gdbarch,
+ ppc_linux_init_extra_frame_info);
+
+ set_gdbarch_memory_remove_breakpoint (gdbarch,
+ ppc_linux_memory_remove_breakpoint);
+ }
+ else
+ {
+ set_gdbarch_frameless_function_invocation (gdbarch,
+ rs6000_frameless_function_invocation);
+ set_gdbarch_frame_chain (gdbarch, rs6000_frame_chain);
+ set_gdbarch_frame_saved_pc (gdbarch, rs6000_frame_saved_pc);
+
+ set_gdbarch_frame_init_saved_regs (gdbarch, rs6000_frame_init_saved_regs);
+ set_gdbarch_init_extra_frame_info (gdbarch, rs6000_init_extra_frame_info);
+ }
set_gdbarch_frame_args_address (gdbarch, rs6000_frame_args_address);
set_gdbarch_frame_locals_address (gdbarch, rs6000_frame_args_address);
set_gdbarch_saved_pc_after_call (gdbarch, rs6000_saved_pc_after_call);
generated by cgit v1.1 at 2024-11-28 20:23:47 +0000