#include "gdbtypes.h"
#include "gdbcmd.h"
#include "gdbcore.h"
+#include "gdb_string.h"
#include "value.h"
#include "inferior.h"
#include "dis-asm.h"
+void d10v_frame_find_saved_regs PARAMS ((struct frame_info *fi, struct frame_saved_regs *fsr));
+
+/* Discard from the stack the innermost frame,
+ restoring all saved registers. */
+
void
d10v_pop_frame ()
{
+ struct frame_info *frame = get_current_frame ();
+ int fp, r13;
+ int regnum;
+ struct frame_saved_regs fsr;
+ char raw_buffer[8];
+
+ fp = (int)FRAME_FP (frame);
+
+ /* fill out fsr with the address of where each */
+ /* register was stored in the frame */
+ get_frame_saved_regs (frame, &fsr);
+
+ /* r13 contains the old PC. save it. */
+ r13 = (int)read_register (13);
+
+ /* now update the current registers with the old values */
+ for (regnum = A0_REGNUM; regnum < A0_REGNUM+2 ; regnum++)
+ {
+ if (fsr.regs[regnum])
+ {
+ read_memory (fsr.regs[regnum], raw_buffer, 8);
+ write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 8);
+ }
+ }
+ for (regnum = 0; regnum < SP_REGNUM; regnum++)
+ {
+ if (fsr.regs[regnum])
+ {
+ write_register (regnum, read_memory_unsigned_integer (fsr.regs[regnum], 2));
+ }
+ }
+ if (fsr.regs[PSW_REGNUM])
+ {
+ write_register (PSW_REGNUM, read_memory_unsigned_integer (fsr.regs[PSW_REGNUM], 2));
+ }
+
+ /* PC is set to r13 */
+ write_register (PC_REGNUM, (LONGEST)r13);
+ write_register (SP_REGNUM, fp - frame->size);
+ flush_cached_frames ();
+}
+
+static int
+check_prologue (op)
+ unsigned short op;
+{
+ /* st rn, @-sp */
+ if ((op & 0x7E1F) == 0x6C1F)
+ return 1;
+
+ /* st2w rn, @-sp */
+ if ((op & 0x7E3F) == 0x6E1F)
+ return 1;
+
+ /* subi sp, n */
+ if ((op & 0x7FE1) == 0x01E1)
+ return 1;
+
+ /* mv r11, sp */
+ if (op == 0x417E)
+ return 1;
+
+ /* nop */
+ if (op == 0x5E00)
+ return 1;
+
+ /* st rn, @sp */
+ if ((op & 0x7E1F) == 0x681E)
+ return 1;
+
+ /* st2w rn, @sp */
+ if ((op & 0x7E3F) == 0x3A1E)
+ return 1;
+
+ return 0;
}
CORE_ADDR
-d10v_skip_prologue (start_pc)
- CORE_ADDR start_pc;
+d10v_skip_prologue (pc)
+ CORE_ADDR pc;
{
+ unsigned long op;
+ unsigned short op1, op2;
+
+ if (target_read_memory (pc, (char *)&op, 4))
+ return pc; /* Can't access it -- assume no prologue. */
+
+ while (1)
+ {
+ op = (unsigned long)read_memory_integer (pc, 4);
+ if ((op & 0xC0000000) == 0xC0000000)
+ {
+ /* long instruction */
+ if ( ((op & 0x3FFF0000) != 0x01FF0000) && /* add3 sp,sp,n */
+ ((op & 0x3F0F0000) != 0x340F0000) && /* st rn, @(offset,sp) */
+ ((op & 0x3F1F0000) != 0x350F0000)) /* st2w rn, @(offset,sp) */
+ break;
+ }
+ else
+ {
+ /* short instructions */
+ op1 = (op & 0x3FFF8000) >> 15;
+ op2 = op & 0x7FFF;
+ if (!check_prologue(op1) || !check_prologue(op2))
+ break;
+ }
+ pc += 4;
+ }
+ return pc;
}
+/* Given a GDB frame, determine the address of the calling function's frame.
+ This will be used to create a new GDB frame struct, and then
+ INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
+*/
+
CORE_ADDR
d10v_frame_chain (frame)
struct frame_info *frame;
{
- if (!inside_entry_file (frame->pc))
- return read_memory_integer (FRAME_FP (frame) + frame->f_offset, 4);
- else
- return 0;
+ struct frame_saved_regs fsr;
+ d10v_frame_find_saved_regs (frame, &fsr);
+ return read_memory_unsigned_integer(fsr.regs[FP_REGNUM],2);
}
+static int next_addr;
+
+static int
+prologue_find_regs (op, fsr, addr)
+ unsigned short op;
+ struct frame_saved_regs *fsr;
+ CORE_ADDR addr;
+{
+ int n;
+
+ /* st rn, @-sp */
+ if ((op & 0x7E1F) == 0x6C1F)
+ {
+ n = (op & 0x1E0) >> 5;
+ next_addr -= 2;
+ fsr->regs[n] = next_addr;
+ return 1;
+ }
+
+ /* st2w rn, @-sp */
+ else if ((op & 0x7E3F) == 0x6E1F)
+ {
+ n = (op & 0x1E0) >> 5;
+ next_addr -= 4;
+ fsr->regs[n] = next_addr;
+ fsr->regs[n+1] = next_addr+2;
+ return 1;
+ }
+
+ /* subi sp, n */
+ if ((op & 0x7FE1) == 0x01E1)
+ {
+ n = (op & 0x1E) >> 1;
+ if (n == 0)
+ n = 16;
+ next_addr -= n;
+ return 1;
+ }
+
+ /* mv r11, sp */
+ if (op == 0x417E)
+ return 1;
+
+ /* nop */
+ if (op == 0x5E00)
+ return 1;
+
+ /* st rn, @sp */
+ if ((op & 0x7E1F) == 0x681E)
+ {
+ n = (op & 0x1E0) >> 5;
+ fsr->regs[n] = next_addr;
+ return 1;
+ }
+
+ /* st2w rn, @sp */
+ if ((op & 0x7E3F) == 0x3A1E)
+ {
+ n = (op & 0x1E0) >> 5;
+ fsr->regs[n] = next_addr;
+ fsr->regs[n+1] = next_addr+2;
+ return 1;
+ }
+
+ return 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
d10v_frame_find_saved_regs (fi, fsr)
struct frame_info *fi;
struct frame_saved_regs *fsr;
-{
+{
+ CORE_ADDR fp, pc;
+ unsigned long op;
+ unsigned short op1, op2;
+ int i;
+
+ fp = fi->frame;
+ memset (fsr, 0, sizeof (*fsr));
+ next_addr = 0;
+
+ pc = get_pc_function_start (fi->pc);
+
+ while (1)
+ {
+ op = (unsigned long)read_memory_integer (pc, 4);
+ if ((op & 0xC0000000) == 0xC0000000)
+ {
+ /* long instruction */
+ if ((op & 0x3FFF0000) == 0x01FF0000)
+ {
+ /* add3 sp,sp,n */
+ short n = op & 0xFFFF;
+ next_addr += n;
+ }
+ else if ((op & 0x3F0F0000) == 0x340F0000)
+ {
+ /* st rn, @(offset,sp) */
+ short offset = op & 0xFFFF;
+ short n = (op >> 20) & 0xF;
+ fsr->regs[n] = next_addr + offset;
+ }
+ else if ((op & 0x3F1F0000) == 0x350F0000)
+ {
+ /* st2w rn, @(offset,sp) */
+ short offset = op & 0xFFFF;
+ short n = (op >> 20) & 0xF;
+ fsr->regs[n] = next_addr + offset;
+ fsr->regs[n+1] = next_addr + offset + 2;
+ }
+ else
+ break;
+ }
+ else
+ {
+ /* short instructions */
+ op1 = (op & 0x3FFF8000) >> 15;
+ op2 = op & 0x7FFF;
+ if (!prologue_find_regs(op1,fsr,pc) || !prologue_find_regs(op2,fsr,pc))
+ break;
+ }
+ pc += 4;
+ }
+
+ fi->size = -next_addr;
+
+ for (i=0; i<NUM_REGS; i++)
+ if (fsr->regs[i])
+ {
+ fsr->regs[i] = fp - (next_addr - fsr->regs[i]);
+ }
+
+ if (fsr->regs[13])
+ fi->return_pc = (read_memory_unsigned_integer(fsr->regs[13],2)-1) << 2;
+ else
+ fi->return_pc = (read_register(13) - 1) << 2;
}
void
struct frame_info *fi;
{
struct frame_saved_regs dummy;
- if (fi->next)
- fi->pc = fi->next->return_pc;
- d10v_frame_find_saved_regs (fi, &dummy);
+
+ if (fi->next && (fi->pc == 0))
+ fi->pc = fi->next->return_pc;
+
+ d10v_frame_find_saved_regs (fi, &dummy);
}
static void
read_register_gen (A0_REGNUM, (char *)&num1);
read_register_gen (A0_REGNUM+1, (char *)&num2);
printf_filtered ("A0-A1 %010llx %010llx\n",num1, num2);
-}
+}
void
_initialize_d10v_tdep ()
{
- struct cmd_list_element *c;
tm_print_insn = print_insn_d10v;
add_com ("regs", class_vars, show_regs, "Print all registers");
}
projects / deliverable / binutils-gdb.git / blobdiff