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* frv-tdep.c (max_instrs_per_bundle, frv_instr_size): New constants.

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(frv_gdbarch_adjust_breakpoint_address): New function.
	(frv_gdbarch_init): Initialize ``gdbarch_adjust_breakpoint_address''
	method.
This commit is contained in:
Kevin Buettner 2003-10-14 00:30:27 +00:00
parent 8723da3b74
commit 46a16dba95
2 changed files with 54 additions and 0 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
2003-10-13 Kevin Buettner <kevinb@redhat.com>
* frv-tdep.c (max_instrs_per_bundle, frv_instr_size): New constants.
(frv_gdbarch_adjust_breakpoint_address): New function.
(frv_gdbarch_init): Initialize ``gdbarch_adjust_breakpoint_address''
method.
2003-10-13 Kevin Buettner <kevinb@redhat.com> 2003-10-13 Kevin Buettner <kevinb@redhat.com>
* breakpoint.h (struct breakpoint): Add new member * breakpoint.h (struct breakpoint): Add new member

47
gdb/frv-tdep.c
View file

@ -37,6 +37,7 @@ static gdbarch_init_ftype frv_gdbarch_init;
static gdbarch_register_name_ftype frv_register_name; static gdbarch_register_name_ftype frv_register_name;
static gdbarch_breakpoint_from_pc_ftype frv_breakpoint_from_pc; static gdbarch_breakpoint_from_pc_ftype frv_breakpoint_from_pc;
static gdbarch_adjust_breakpoint_address_ftype frv_gdbarch_adjust_breakpoint_address;
static gdbarch_skip_prologue_ftype frv_skip_prologue; static gdbarch_skip_prologue_ftype frv_skip_prologue;
static gdbarch_deprecated_extract_return_value_ftype frv_extract_return_value; static gdbarch_deprecated_extract_return_value_ftype frv_extract_return_value;
static gdbarch_deprecated_extract_struct_value_address_ftype frv_extract_struct_value_address; static gdbarch_deprecated_extract_struct_value_address_ftype frv_extract_struct_value_address;
@ -271,6 +272,51 @@ frv_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenp)
return breakpoint; return breakpoint;
} }
/* Define the maximum number of instructions which may be packed into a
bundle (VLIW instruction). */
static const int max_instrs_per_bundle = 8;
/* Define the size (in bytes) of an FR-V instruction. */
static const int frv_instr_size = 4;
/* Adjust a breakpoint's address to account for the FR-V architecture's
constraint that a break instruction must not appear as any but the
first instruction in the bundle. */
static CORE_ADDR
frv_gdbarch_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
{
int count = max_instrs_per_bundle;
CORE_ADDR addr = bpaddr - frv_instr_size;
CORE_ADDR func_start = get_pc_function_start (bpaddr);
/* Find the end of the previous packing sequence. This will be indicated
by either attempting to access some inaccessible memory or by finding
an instruction word whose packing bit is set to one. */
while (count-- > 0 && addr >= func_start)
{
char instr[frv_instr_size];
int status;
status = read_memory_nobpt (addr, instr, sizeof instr);
if (status != 0)
break;
/* This is a big endian architecture, so byte zero will have most
significant byte. The most significant bit of this byte is the
packing bit. */
if (instr[0] & 0x80)
break;
addr -= frv_instr_size;
}
if (count > 0)
bpaddr = addr + frv_instr_size;
return bpaddr;
}
/* Return true if REG is a caller-saves ("scratch") register, /* Return true if REG is a caller-saves ("scratch") register,
false otherwise. */ false otherwise. */
@ -1114,6 +1160,7 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_skip_prologue (gdbarch, frv_skip_prologue); set_gdbarch_skip_prologue (gdbarch, frv_skip_prologue);
set_gdbarch_breakpoint_from_pc (gdbarch, frv_breakpoint_from_pc); set_gdbarch_breakpoint_from_pc (gdbarch, frv_breakpoint_from_pc);
set_gdbarch_adjust_breakpoint_address (gdbarch, frv_gdbarch_adjust_breakpoint_address);
set_gdbarch_frame_args_skip (gdbarch, 0); set_gdbarch_frame_args_skip (gdbarch, 0);
set_gdbarch_frameless_function_invocation (gdbarch, frv_frameless_function_invocation); set_gdbarch_frameless_function_invocation (gdbarch, frv_frameless_function_invocation);