-static void
-alpha_push_dummy_frame (void)
-{
- int ireg;
- struct linked_proc_info *link;
- alpha_extra_func_info_t proc_desc;
- CORE_ADDR sp = read_register (SP_REGNUM);
- CORE_ADDR save_address;
- char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE];
- unsigned long mask;
-
- link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info));
- link->next = linked_proc_desc_table;
- linked_proc_desc_table = link;
-
- proc_desc = &link->info;
-
- /*
- * The registers we must save are all those not preserved across
- * procedure calls.
- * In addition, we must save the PC and RA.
- *
- * Dummy frame layout:
- * (high memory)
- * Saved PC
- * Saved F30
- * ...
- * Saved F0
- * Saved R29
- * ...
- * Saved R0
- * Saved R26 (RA)
- * Parameter build area
- * (low memory)
- */
-
-/* MASK(i,j) == (1<<i) + (1<<(i+1)) + ... + (1<<j)). Assume i<=j<31. */
-#define MASK(i,j) ((((LONGEST)1 << ((j)+1)) - 1) ^ (((LONGEST)1 << (i)) - 1))
-#define GEN_REG_SAVE_MASK (MASK(0,8) | MASK(16,29))
-#define GEN_REG_SAVE_COUNT 24
-#define FLOAT_REG_SAVE_MASK (MASK(0,1) | MASK(10,30))
-#define FLOAT_REG_SAVE_COUNT 23
- /* The special register is the PC as we have no bit for it in the save masks.
- alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */
-#define SPECIAL_REG_SAVE_COUNT 1
-
- PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK;
- PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK;
- /* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA,
- but keep SP aligned to a multiple of 16. */
- PROC_REG_OFFSET (proc_desc) =
- -((8 * (SPECIAL_REG_SAVE_COUNT
- + GEN_REG_SAVE_COUNT
- + FLOAT_REG_SAVE_COUNT)
- + 15) & ~15);
- PROC_FREG_OFFSET (proc_desc) =
- PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT;
-
- /* Save general registers.
- The return address register is the first saved register, all other
- registers follow in ascending order.
- The PC is saved immediately below the SP. */
- save_address = sp + PROC_REG_OFFSET (proc_desc);
- store_address (raw_buffer, 8, read_register (ALPHA_RA_REGNUM));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- mask = PROC_REG_MASK (proc_desc) & 0xffffffffL;
- for (ireg = 0; mask; ireg++, mask >>= 1)
- if (mask & 1)
- {
- if (ireg == ALPHA_RA_REGNUM)
- continue;
- store_address (raw_buffer, 8, read_register (ireg));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- }
-
- store_address (raw_buffer, 8, read_register (PC_REGNUM));
- write_memory (sp - 8, raw_buffer, 8);
-
- /* Save floating point registers. */
- save_address = sp + PROC_FREG_OFFSET (proc_desc);
- mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL;
- for (ireg = 0; mask; ireg++, mask >>= 1)
- if (mask & 1)
- {
- store_address (raw_buffer, 8, read_register (ireg + FP0_REGNUM));
- write_memory (save_address, raw_buffer, 8);
- save_address += 8;
- }
-
- /* Set and save the frame address for the dummy.
- This is tricky. The only registers that are suitable for a frame save
- are those that are preserved across procedure calls (s0-s6). But if
- a read system call is interrupted and then a dummy call is made
- (see testsuite/gdb.t17/interrupt.exp) the dummy call hangs till the read
- is satisfied. Then it returns with the s0-s6 registers set to the values
- on entry to the read system call and our dummy frame pointer would be
- destroyed. So we save the dummy frame in the proc_desc and handle the
- retrieval of the frame pointer of a dummy specifically. The frame register
- is set to the virtual frame (pseudo) register, it's value will always
- be read as zero and will help us to catch any errors in the dummy frame
- retrieval code. */
- PROC_DUMMY_FRAME (proc_desc) = sp;
- PROC_FRAME_REG (proc_desc) = FP_REGNUM;
- PROC_FRAME_OFFSET (proc_desc) = 0;
- sp += PROC_REG_OFFSET (proc_desc);
- write_register (SP_REGNUM, sp);
-
- PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS ();
- PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4;
-
- SET_PROC_DESC_IS_DUMMY (proc_desc);
- PROC_PC_REG (proc_desc) = ALPHA_RA_REGNUM;
-}