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* config/pa/tm-hppa.h (unwind_table_entry): Use one of the 

reserved fields to hold a stub unwind entry type.  Fix typo.
        (stub_unwind_entry): New structure for raw stub unwind entries.
        (stub_unwind_types): The types of stubs we may encounter.
        (UNWIND_ENTRY_SIZE, STUB_UNWIND_ENTRY_SIZE): New defines.
        * hppa-tdep.c (rp_saved): Use additional information provided
        by linker stub unwind descriptors.
        (frameless_function_invocation): Likewise.
        (frame_chain_valid): Likewise.
        * paread.c (compare_unwind_entries): New function for sorting
        unwind table entries.
        (read_unwind_info): Rewrite to remove dependency on host endianness.
        Read in data from the $UNWIND_END$ subspace which contains linker
        stub unwind descriptors.  Merge that data into the basic unwind
        table.
This commit is contained in:
Jeff Law 1994-01-18 04:04:36 +00:00
parent 5c38fcee3f
commit c7f3b703a3
4 changed files with 221 additions and 111 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
gdb/ChangeLog
View File

@ -1,5 +1,21 @@
Mon Jan 17 20:00:51 1994 Jeffrey A. Law (law@snake.cs.utah.edu)
* config/pa/tm-hppa.h (unwind_table_entry): Use one of the
reserved fields to hold a stub unwind entry type. Fix typo.
(stub_unwind_entry): New structure for raw stub unwind entries.
(stub_unwind_types): The types of stubs we may encounter.
(UNWIND_ENTRY_SIZE, STUB_UNWIND_ENTRY_SIZE): New defines.
* hppa-tdep.c (rp_saved): Use additional information provided
by linker stub unwind descriptors.
(frameless_function_invocation): Likewise.
(frame_chain_valid): Likewise.
* paread.c (compare_unwind_entries): New function for sorting
unwind table entries.
(read_unwind_info): Rewrite to remove dependency on host endianness.
Read in data from the $UNWIND_END$ subspace which contains linker
stub unwind descriptors. Merge that data into the basic unwind
table.
* hppab-nat.c (_initialize_kernel_u_addr): Delete unwanted functions.
Mon Jan 17 22:00:15 1994 Jim Kingdon (kingdon@lioth.cygnus.com)

139
gdb/config/pa/tm-hppa.h
View File

@ -156,7 +156,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#define FLAGS_REGNUM 0 /* Various status flags */
#define RP_REGNUM 2 /* return pointer */
#define FP_REGNUM 4 /* Contains address of executing stack */
#define FP_REGNUM 3 /* Contains address of executing stack */
/* frame */
#define SP_REGNUM 30 /* Contains address of top of stack */
#define SAR_REGNUM 32 /* shift amount register */
@ -319,97 +319,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#define FRAME_ARGS_SKIP 0
/* Put here the code to store, into a struct frame_saved_regs,
the addresses of the saved registers of frame described by FRAME_INFO.
This includes special registers such as pc and fp saved in special
ways in the stack frame. sp is even more special:
the address we return for it IS the sp for the next frame. */
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
hppa_frame_find_saved_regs (frame_info, &frame_saved_regs)
/* Deal with dummy functions later. */
#define STW_P(INSN) (((INSN) & 0xfc000000) == 0x68000000)
#define ADDIL_P(INSN) (((INSN) & 0xfc000000) == 0x28000000)
#define LDO_P(INSN) (((INSN) & 0xfc00c000) == 0x34000000)
#define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
{ register int regnum; \
register CORE_ADDR next_addr; \
register CORE_ADDR pc; \
unsigned this_insn; \
unsigned address; \
\
memset (&frame_saved_regs, '\0', sizeof frame_saved_regs); \
if ((frame_info->pc >= (frame_info)->frame \
&& (frame_info)->pc <= ((frame_info)->frame + CALL_DUMMY_LENGTH \
+ 32 * 4 + (NUM_REGS - FP0_REGNUM) * 8 \
+ 6 * 4))) \
find_dummy_frame_regs ((frame_info), &(frame_saved_regs)); \
else \
{ pc = get_pc_function_start ((frame_info)->pc); \
if (read_memory_integer (pc, 4) == 0x6BC23FD9) \
{ (frame_saved_regs).regs[RP_REGNUM] = (frame_info)->frame - 20;\
pc = pc + 4; \
} \
if (read_memory_integer (pc, 4) != 0x8040241) goto lose; \
pc += 8; /* skip "copy 4,1; copy 30, 4" */ \
/* skip either "stw 1,0(4);addil L'fsize,30;ldo R'fsize(1),30" \
or "stwm 1,fsize(30)" */ \
if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) \
pc += 12; \
else \
pc += 4; \
while (1) \
{ this_insn = read_memory_integer(pc, 4); \
if (STW_P (this_insn)) /* stw */ \
{ regnum = GET_FIELD (this_insn, 11, 15); \
if (!regnum) goto lose; \
(frame_saved_regs).regs[regnum] = (frame_info)->frame + \
extract_14 (this_insn); \
pc += 4; \
} \
else if (ADDIL_P (this_insn)) /* addil */ \
{ int next_insn; \
next_insn = read_memory_integer(pc + 4, 4); \
if (STW_P (next_insn)) /* stw */ \
{ regnum = GET_FIELD (this_insn, 6, 10); \
if (!regnum) goto lose; \
(frame_saved_regs).regs[regnum] = (frame_info)->frame +\
(extract_21 (this_insn) << 11) + extract_14 (next_insn);\
pc += 8; \
} \
else \
break; \
} \
else \
{ pc += 4; \
break; \
} \
} \
this_insn = read_memory_integer (pc, 4); \
if (LDO_P (this_insn)) \
{ next_addr = (frame_info)->frame + extract_14 (this_insn); \
pc += 4; \
} \
else if (ADDIL_P (this_insn)) \
{ next_addr = (frame_info)->frame + (extract_21 (this_insn) << 11)\
+ extract_14 (read_memory_integer (pc + 4, 4)); \
pc += 8; \
} \
while (1) \
{ this_insn = read_memory_integer (pc, 4); \
if ((this_insn & 0xfc001fe0) == 0x2c001220) /* fstds,ma */ \
{ regnum = GET_FIELD (this_insn, 27, 31); \
(frame_saved_regs).regs[regnum + FP0_REGNUM] = next_addr; \
next_addr += 8; \
pc += 4; \
} \
else \
break; \
} \
lose: \
(frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \
(frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame -4; \
}}
/* Things needed for making the inferior call functions. */
@ -439,7 +351,7 @@ call_dummy
fldds -12(0, r1), fr7
ldil 0, r22 ; target will be placed here.
ldo 0(r22), r22
ldsid (0,r22), r3
ldsid (0,r22), r4
ldil 0, r1 ; _sr4export will be placed here.
ldo 0(r1), r1
ldsid (0,r1), r19
@ -467,8 +379,8 @@ text_space ; Otherwise, go through _sr4export,
#define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\
0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\
0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A3,\
0x20200000, 0x34210000, 0x002010b3, 0x82632022,\
0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\
0x20200000, 0x34210000, 0x002010b3, 0x82642022,\
0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\
0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\
0x00151820, 0xe6c00002}
@ -514,7 +426,7 @@ struct unwind_table_entry {
unsigned int Millicode : 1;
unsigned int Millicode_save_sr0 : 1;
unsigned int Region_description : 2;
unsigned int reserverd1 : 1;
unsigned int reserved1 : 1;
unsigned int Entry_SR : 1;
unsigned int Entry_FR : 4; /* number saved */
unsigned int Entry_GR : 5; /* number saved */
@ -525,6 +437,8 @@ struct unwind_table_entry {
unsigned int Stack_Overflow_Check : 1;
unsigned int Two_Instruction_SP_Increment:1;
unsigned int Ada_Region : 1;
/* Use this field to store a stub unwind type. */
#define stub_type reserved2
unsigned int reserved2 : 4;
unsigned int Save_SP : 1;
unsigned int Save_RP : 1;
@ -539,6 +453,41 @@ struct unwind_table_entry {
unsigned int Total_frame_size : 27;
};
/* HP linkers also generate unwinds for various linker-generated stubs.
GDB reads in the stubs from the $UNWIND_END$ subspace, then
"converts" them into normal unwind entries using some of the reserved
fields to store the stub type. */
struct stub_unwind_entry
{
/* The offset within the executable for the associated stub. */
unsigned stub_offset;
/* The type of stub this unwind entry describes. */
char type;
/* Unknown. Not needed by GDB at this time. */
char prs_info;
/* Length (in instructions) of the associated stub. */
short stub_length;
};
/* Sizes (in bytes) of the native unwind entries. */
#define UNWIND_ENTRY_SIZE 16
#define STUB_UNWIND_ENTRY_SIZE 8
/* The gaps represent linker stubs used in MPE and space for future
expansion. */
enum unwind_stub_types
{
LONG_BRANCH = 1,
PARAMETER_RELOCATION = 2,
EXPORT = 10,
IMPORT = 11,
};
/* Info about the unwind table associated with an object file. This is hung
off of the objfile->obj_private pointer, and is allocated in the objfile's
psymbol obstack. This allows us to have unique unwind info for each

16
gdb/hppa-tdep.c
View File

@ -434,6 +434,18 @@ rp_saved (pc)
if (u->Save_RP)
return -20;
else if (u->stub_type != 0)
{
switch (u->stub_type)
{
case EXPORT:
return -24;
case PARAMETER_RELOCATION:
return -8;
default:
return 0;
}
}
else
return 0;
}
@ -449,7 +461,7 @@ frameless_function_invocation (frame)
if (u == 0)
return frameless_look_for_prologue (frame);
return (u->Total_frame_size == 0);
return (u->Total_frame_size == 0 && u->stub_type == 0);
}
CORE_ADDR
@ -671,7 +683,7 @@ frame_chain_valid (chain, thisframe)
if (u == NULL)
return 1;
if (u->Save_SP || u->Total_frame_size)
if (u->Save_SP || u->Total_frame_size || u->stub_type != 0)
return 1;
if (pc_in_linker_stub (thisframe->pc))

161
gdb/paread.c
View File

@ -47,6 +47,10 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
static void
pa_symfile_init PARAMS ((struct objfile *));
static int
compare_unwind_entries PARAMS ((struct unwind_table_entry *,
struct unwind_table_entry *));
static void
pa_new_init PARAMS ((struct objfile *));
@ -232,6 +236,23 @@ pa_symtab_read (abfd, addr, objfile)
install_minimal_symbols (objfile);
}
/* Compare the start address for two unwind entries returning 1 if
the first address is larger than the second, -1 if the second is
larger than the first, and zero if they are equal. */
static int
compare_unwind_entries (a, b)
struct unwind_table_entry *a;
struct unwind_table_entry *b;
{
if (a->region_start > b->region_start)
return 1;
else if (a->region_start < b->region_start)
return -1;
else
return 0;
}
/* Read in the backtrace information stored in the `$UNWIND_START$' section of
the object file. This info is used mainly by find_unwind_entry() to find
out the stack frame size and frame pointer used by procedures. We put
@ -242,7 +263,9 @@ static void
read_unwind_info (objfile)
struct objfile *objfile;
{
asection *unwind_sec;
asection *unwind_sec, *stub_unwind_sec;
unsigned unwind_size, stub_unwind_size, total_size;
unsigned index, unwind_entries, stub_entries, total_entries;
struct obj_unwind_info *ui;
ui = obstack_alloc (&objfile->psymbol_obstack,
@ -252,22 +275,132 @@ read_unwind_info (objfile)
ui->cache = NULL;
ui->last = -1;
unwind_sec = bfd_get_section_by_name (objfile->obfd,
"$UNWIND_START$");
/* Get hooks to both unwind sections. */
unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_START$");
stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
/* Get sizes and unwind counts for both sections. */
if (unwind_sec)
{
int size;
int i, *ip;
size = bfd_section_size (objfile->obfd, unwind_sec);
ui->table = obstack_alloc (&objfile->psymbol_obstack, size);
ui->last = size / sizeof (struct unwind_table_entry) - 1;
bfd_get_section_contents (objfile->obfd, unwind_sec, ui->table,
0, size);
OBJ_UNWIND_INFO (objfile) = ui;
unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
}
else
{
unwind_size = 0;
unwind_entries = 0;
}
if (stub_unwind_sec)
{
stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
}
else
{
stub_unwind_size = 0;
stub_entries = 0;
}
/* Compute total number of stubs. */
total_entries = unwind_entries + stub_entries;
total_size = total_entries * sizeof (struct unwind_table_entry);
/* Allocate memory for the unwind table. */
ui->table = obstack_alloc (&objfile->psymbol_obstack, total_size);
ui->last = total_entries + 1;
/* We will read the unwind entries into temporary memory, then
fill in the actual unwind table. */
if (unwind_size > 0)
{
unsigned long tmp;
unsigned i;
char *buf = alloca (unwind_size);
bfd_get_section_contents (objfile->obfd, unwind_sec, buf, 0, unwind_size);
/* Now internalize the information being careful to handle host/target
endian issues. */
for (i = 0; i < unwind_entries; i++)
{
ui->table[i].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *)buf);
buf += 4;
ui->table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
buf += 4;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
buf += 4;
ui->table[i].Cannot_unwind = (tmp >> 31) & 0x1;;
ui->table[i].Millicode = (tmp >> 30) & 0x1;
ui->table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
ui->table[i].Region_description = (tmp >> 27) & 0x3;
ui->table[i].reserved1 = (tmp >> 26) & 0x1;
ui->table[i].Entry_SR = (tmp >> 25) & 0x1;
ui->table[i].Entry_FR = (tmp >> 21) & 0xf;
ui->table[i].Entry_GR = (tmp >> 16) & 0x1f;
ui->table[i].Args_stored = (tmp >> 15) & 0x1;
ui->table[i].Variable_Frame = (tmp >> 14) & 0x1;
ui->table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
ui->table[i].Frame_Extension_Millicode = (tmp >> 12 ) & 0x1;
ui->table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
ui->table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
ui->table[i].Ada_Region = (tmp >> 9) & 0x1;
ui->table[i].reserved2 = (tmp >> 5) & 0xf;
ui->table[i].Save_SP = (tmp >> 4) & 0x1;
ui->table[i].Save_RP = (tmp >> 3) & 0x1;
ui->table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
ui->table[i].extn_ptr_defined = (tmp >> 1) & 0x1;
ui->table[i].Cleanup_defined = tmp & 0x1;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *)buf);
buf += 4;
ui->table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
ui->table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
ui->table[i].Large_frame = (tmp >> 29) & 0x1;
ui->table[i].reserved4 = (tmp >> 27) & 0x3;
ui->table[i].Total_frame_size = tmp & 0x7ffffff;
}
}
if (stub_unwind_size > 0)
{
unsigned int i;
char *buf = alloca (stub_unwind_size);
/* Read in the stub unwind entries. */
bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
0, stub_unwind_size);
/* Now convert them into regular unwind entries. */
index = unwind_entries;
for (i = 0; i < stub_entries; i++, index++)
{
/* Clear out the next unwind entry. */
memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
/* Convert offset & size into region_start and region_end.
Stuff away the stub type into "reserved" fields. */
ui->table[index].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *) buf);
buf += 4;
ui->table[index].stub_type = bfd_get_8 (objfile->obfd,
(bfd_byte *) buf);
buf += 2;
ui->table[index].region_end
= ui->table[index].region_start + 4 * bfd_get_16 (objfile->obfd,
(bfd_byte *) buf);
buf += 2;
}
}
/* Unwind table needs to be kept sorted. */
qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
compare_unwind_entries);
/* Keep a pointer to the unwind information. */
OBJ_UNWIND_INFO (objfile) = ui;
}
/* Scan and build partial symbols for a symbol file.