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FT32: support for FT32B processor - part 2/2 

FT32B is a new FT32 family member.
This patch adds support for the compressed instructions to gdb and sim.

gdb/ChangeLog:
        * ft32-tdep.c (ft32_fetch_instruction): New function.
        (ft32_analyze_prologue): Use ft32_fetch_instruction().

sim/ChangeLog:
        * ft32/interp.c (step_once): Add ft32 shortcode decoder.
This commit is contained in:
James Bowman 2017-11-01 18:34:25 -07:00
parent 89f3c4b6b9
commit dcc31d286a
4 changed files with 48 additions and 13 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2017-11-01 James Bowman <james.bowman@ftdichip.com>
* ft32-tdep.c (ft32_fetch_instruction): New function.
(ft32_analyze_prologue): Use ft32_fetch_instruction().
2017-10-31 Simon Marchi <simon.marchi@polymtl.ca>
* cli/cli-script.c (execute_control_command): Rename to ...

30
gdb/ft32-tdep.c
View File

@ -139,6 +139,25 @@ ft32_store_return_value (struct type *type, struct regcache *regcache,
}
}
/* Fetch a single 32-bit instruction from address a. If memory contains
a compressed instruction pair, return the expanded instruction. */
static ULONGEST
ft32_fetch_instruction (CORE_ADDR a, int *isize,
enum bfd_endian byte_order)
{
unsigned int sc[2];
ULONGEST inst;
CORE_ADDR a4 = a & ~3;
inst = read_code_unsigned_integer (a4, 4, byte_order);
*isize = ft32_decode_shortcode (a4, inst, sc) ? 2 : 4;
if (*isize == 2)
return sc[1 & (a >> 1)];
else
return inst;
}
/* Decode the instructions within the given address range. Decide
when we must have reached the end of the function prologue. If a
frame_info pointer is provided, fill in its saved_regs etc.
@ -153,6 +172,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR next_addr;
ULONGEST inst;
int isize = 0;
int regnum, pushreg;
struct bound_minimal_symbol msymbol;
const int first_saved_reg = 13; /* The first saved register. */
@ -186,16 +206,15 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
return end_addr;
cache->established = 0;
for (next_addr = start_addr; next_addr < end_addr;)
for (next_addr = start_addr; next_addr < end_addr; next_addr += isize)
{
inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
inst = ft32_fetch_instruction (next_addr, &isize, byte_order);
if (FT32_IS_PUSH (inst))
{
pushreg = FT32_PUSH_REG (inst);
cache->framesize += 4;
cache->saved_regs[FT32_R0_REGNUM + pushreg] = cache->framesize;
next_addr += 4;
}
else if (FT32_IS_CALL (inst))
{
@ -210,7 +229,6 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
cache->saved_regs[FT32_R0_REGNUM + pushreg] =
cache->framesize;
}
next_addr += 4;
}
}
break;
@ -229,7 +247,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
/* It is a LINK? */
if (next_addr < end_addr)
{
inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
inst = ft32_fetch_instruction (next_addr, &isize, byte_order);
if (FT32_IS_LINK (inst))
{
cache->established = 1;
@ -241,7 +259,7 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
cache->saved_regs[FT32_PC_REGNUM] = cache->framesize + 4;
cache->saved_regs[FT32_FP_REGNUM] = 0;
cache->framesize += FT32_LINK_SIZE (inst);
next_addr += 4;
next_addr += isize;
}
}

4
sim/ChangeLog
View File

@ -1,3 +1,7 @@
2017-11-01 James Bowman <james.bowman@ftdichip.com>
* ft32/interp.c (step_once): Add ft32 shortcode decoder.
2017-10-12 James Bowman <james.bowman@ftdichip.com>
* ft32/interp.c (step_once): Replace FT32_FLD_K8 with K15.

22
sim/ft32/interp.c
View File

@ -340,16 +340,24 @@ step_once (SIM_DESC sd)
uint32_t bit_len;
uint32_t upper;
uint32_t insnpc;
unsigned int sc[2];
int isize;
if (cpu->state.cycles >= cpu->state.next_tick_cycle)
{
cpu->state.next_tick_cycle += 100000;
ft32_push (sd, cpu->state.pc);
cpu->state.pc = 12; /* interrupt 1. */
}
inst = ft32_read_item (sd, 2, cpu->state.pc);
cpu->state.cycles += 1;
if ((STATE_ARCHITECTURE (sd)->mach == bfd_mach_ft32b)
&& ft32_decode_shortcode (cpu->state.pc, inst, sc))
{
if ((cpu->state.pc & 3) == 0)
inst = sc[0];
else
inst = sc[1];
isize = 2;
}
else
isize = 4;
/* Handle "call 8" (which is FT32's "break" equivalent) here. */
if (inst == 0x00340002)
{
@ -390,7 +398,7 @@ step_once (SIM_DESC sd)
upper = (inst >> 27);
insnpc = cpu->state.pc;
cpu->state.pc += 4;
cpu->state.pc += isize;
switch (upper)
{
case FT32_PAT_TOC: