root/arch/sparc/include/asm/head_32.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __SPARC_HEAD_H
   3 #define __SPARC_HEAD_H
   4 
   5 #define KERNBASE        0xf0000000  /* First address the kernel will eventually be */
   6 
   7 #define WRITE_PAUSE      nop; nop; nop; /* Have to do this after %wim/%psr chg */
   8 
   9 /* Here are some trap goodies */
  10 
  11 /* Generic trap entry. */
  12 #define TRAP_ENTRY(type, label) \
  13         rd %psr, %l0; b label; rd %wim, %l3; nop;
  14 
  15 /* Data/text faults */
  16 #define SRMMU_TFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 1, %l7;
  17 #define SRMMU_DFAULT rd %psr, %l0; rd %wim, %l3; b srmmu_fault; mov 0, %l7;
  18 
  19 /* This is for traps we should NEVER get. */
  20 #define BAD_TRAP(num) \
  21         rd %psr, %l0; mov num, %l7; b bad_trap_handler; rd %wim, %l3;
  22 
  23 /* This is for traps when we want just skip the instruction which caused it */
  24 #define SKIP_TRAP(type, name) \
  25         jmpl %l2, %g0; rett %l2 + 4; nop; nop;
  26 
  27 /* Notice that for the system calls we pull a trick.  We load up a
  28  * different pointer to the system call vector table in %l7, but call
  29  * the same generic system call low-level entry point.  The trap table
  30  * entry sequences are also HyperSparc pipeline friendly ;-)
  31  */
  32 
  33 /* Software trap for Linux system calls. */
  34 #define LINUX_SYSCALL_TRAP \
  35         sethi %hi(sys_call_table), %l7; \
  36         or %l7, %lo(sys_call_table), %l7; \
  37         b linux_sparc_syscall; \
  38         rd %psr, %l0;
  39 
  40 #define BREAKPOINT_TRAP \
  41         b breakpoint_trap; \
  42         rd %psr,%l0; \
  43         nop; \
  44         nop;
  45 
  46 #ifdef CONFIG_KGDB
  47 #define KGDB_TRAP(num)                  \
  48         mov num, %l7;                   \
  49         b kgdb_trap_low;                \
  50         rd %psr,%l0;                    \
  51         nop;
  52 #else
  53 #define KGDB_TRAP(num) \
  54         BAD_TRAP(num)
  55 #endif
  56 
  57 /* The Get Condition Codes software trap for userland. */
  58 #define GETCC_TRAP \
  59         b getcc_trap_handler; rd %psr, %l0; nop; nop;
  60 
  61 /* The Set Condition Codes software trap for userland. */
  62 #define SETCC_TRAP \
  63         b setcc_trap_handler; rd %psr, %l0; nop; nop;
  64 
  65 /* The Get PSR software trap for userland. */
  66 #define GETPSR_TRAP \
  67         rd %psr, %i0; jmp %l2; rett %l2 + 4; nop;
  68 
  69 /* This is for hard interrupts from level 1-14, 15 is non-maskable (nmi) and
  70  * gets handled with another macro.
  71  */
  72 #define TRAP_ENTRY_INTERRUPT(int_level) \
  73         mov int_level, %l7; rd %psr, %l0; b real_irq_entry; rd %wim, %l3;
  74 
  75 /* Window overflows/underflows are special and we need to try to be as
  76  * efficient as possible here....
  77  */
  78 #define WINDOW_SPILL \
  79         rd %psr, %l0; rd %wim, %l3; b spill_window_entry; andcc %l0, PSR_PS, %g0;
  80 
  81 #define WINDOW_FILL \
  82         rd %psr, %l0; rd %wim, %l3; b fill_window_entry; andcc %l0, PSR_PS, %g0;
  83 
  84 #endif /* __SPARC_HEAD_H */