[PATCH] powerpc: Cleanup LOADADDR etc. asm macros

This patch consolidates the variety of macros used for loading 32 or
64-bit constants in assembler (LOADADDR, LOADBASE, SET_REG_TO_*).  The
idea is to make the set of macros consistent across 32 and 64 bit and
to make it more obvious which is the appropriate one to use in a given
situation.  The new macros and their semantics are described in the
comments in ppc_asm.h.

In the process, we change several places that were unnecessarily using
immediate loads on ppc64 to use the GOT/TOC.  Likewise we cleanup a
couple of places where we were clumsily subtracting PAGE_OFFSET with
asm instructions to use assemble-time arithmetic or the toreal() macro
instead.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 44 insertions, 43 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 1c066d125375..b3718f3eb7b5 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -154,12 +154,12 @@ _GLOBAL(__secondary_hold)
         bne     100b
 
 #ifdef CONFIG_HMT
-        LOADADDR(r4, .hmt_init)
+        SET_REG_IMMEDIATE(r4, .hmt_init)
         mtctr   r4
         bctr
 #else
 #ifdef CONFIG_SMP
-        LOADADDR(r4, .pSeries_secondary_smp_init)
+        LOAD_REG_IMMEDIATE(r4, .pSeries_secondary_smp_init)
         mtctr   r4
         mr      r3,r24
         bctr
@@ -205,9 +205,10 @@ exception_marker:
 #define EX_LR           72
 
 /*
- * We're short on space and time in the exception prolog, so we can't use
- * the normal LOADADDR macro. Normally we just need the low halfword of the
- * address, but for Kdump we need the whole low word.
+ * We're short on space and time in the exception prolog, so we can't
+ * use the normal SET_REG_IMMEDIATE macro. Normally we just need the
+ * low halfword of the address, but for Kdump we need the whole low
+ * word.
  */
 #ifdef CONFIG_CRASH_DUMP
 #define LOAD_HANDLER(reg, label)                                        \
@@ -713,7 +714,7 @@ system_reset_iSeries:
         lbz     r23,PACAPROCSTART(r13)  /* Test if this processor
                                          * should start */
         sync
-        LOADADDR(r3,current_set)
+        LOAD_REG_IMMEDIATE(r3,current_set)
         sldi    r28,r24,3               /* get current_set[cpu#] */
         ldx     r3,r3,r28
         addi    r1,r3,THREAD_SIZE
@@ -746,8 +747,8 @@ iSeries_secondary_smp_loop:
 decrementer_iSeries_masked:
         li      r11,1
         stb     r11,PACALPPACA+LPPACADECRINT(r13)
-        LOADBASE(r12,tb_ticks_per_jiffy)
-        lwz     r12,OFF(tb_ticks_per_jiffy)(r12)
+        LOAD_REG_ADDRBASE(r12,tb_ticks_per_jiffy)
+        lwz     r12,ADDROFF(tb_ticks_per_jiffy)(r12)
         mtspr   SPRN_DEC,r12
         /* fall through */
 
@@ -1412,7 +1413,7 @@ _GLOBAL(pSeries_secondary_smp_init)
          * physical cpu id in r24, we need to search the pacas to find
          * which logical id maps to our physical one.
          */
-        LOADADDR(r13, paca)             /* Get base vaddr of paca array  */
+        LOAD_REG_IMMEDIATE(r13, paca)   /* Get base vaddr of paca array  */
         li      r5,0                    /* logical cpu id                */
 1:      lhz     r6,PACAHWCPUID(r13)     /* Load HW procid from paca      */
         cmpw    r6,r24                  /* Compare to our id             */
@@ -1446,8 +1447,8 @@ _GLOBAL(pSeries_secondary_smp_init)
 #ifdef CONFIG_PPC_ISERIES
 _STATIC(__start_initialization_iSeries)
         /* Clear out the BSS */
-        LOADADDR(r11,__bss_stop)
-        LOADADDR(r8,__bss_start)
+        LOAD_REG_IMMEDIATE(r11,__bss_stop)
+        LOAD_REG_IMMEDIATE(r8,__bss_start)
         sub     r11,r11,r8              /* bss size                     */
         addi    r11,r11,7               /* round up to an even double word */
         rldicl. r11,r11,61,3            /* shift right by 3             */
@@ -1458,17 +1459,17 @@ _STATIC(__start_initialization_iSeries)
 3:      stdu    r0,8(r8)
         bdnz    3b
 4:
-        LOADADDR(r1,init_thread_union)
+        LOAD_REG_IMMEDIATE(r1,init_thread_union)
         addi    r1,r1,THREAD_SIZE
         li      r0,0
         stdu    r0,-STACK_FRAME_OVERHEAD(r1)
 
-        LOADADDR(r3,cpu_specs)
-        LOADADDR(r4,cur_cpu_spec)
+        LOAD_REG_IMMEDIATE(r3,cpu_specs)
+        LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
         li      r5,0
         bl      .identify_cpu
 
-        LOADADDR(r2,__toc_start)
+        LOAD_REG_IMMEDIATE(r2,__toc_start)
         addi    r2,r2,0x4000
         addi    r2,r2,0x4000
 
@@ -1528,7 +1529,7 @@ _GLOBAL(__start_initialization_multiplatform)
         li      r24,0
 
         /* Switch off MMU if not already */
-        LOADADDR(r4, .__after_prom_start - KERNELBASE)
+        LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
         add     r4,r4,r30
         bl      .__mmu_off
         b       .__after_prom_start
@@ -1548,7 +1549,7 @@ _STATIC(__boot_from_prom)
         /* put a relocation offset into r3 */
         bl      .reloc_offset
 
-        LOADADDR(r2,__toc_start)
+        LOAD_REG_IMMEDIATE(r2,__toc_start)
         addi    r2,r2,0x4000
         addi    r2,r2,0x4000
 
@@ -1588,9 +1589,9 @@ _STATIC(__after_prom_start)
  */
         bl      .reloc_offset
         mr      r26,r3
-        SET_REG_TO_CONST(r27,KERNELBASE)
+        LOAD_REG_IMMEDIATE(r27, KERNELBASE)
 
-        LOADADDR(r3, PHYSICAL_START)    /* target addr */
+        LOAD_REG_IMMEDIATE(r3, PHYSICAL_START)  /* target addr */
 
         // XXX FIXME: Use phys returned by OF (r30)
         add     r4,r27,r26              /* source addr                   */
@@ -1598,7 +1599,7 @@ _STATIC(__after_prom_start)
                                         /*   i.e. where we are running   */
                                         /*      the source addr          */
 
-        LOADADDR(r5,copy_to_here)       /* # bytes of memory to copy     */
+        LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */
         sub     r5,r5,r27
 
         li      r6,0x100                /* Start offset, the first 0x100 */
@@ -1608,11 +1609,11 @@ _STATIC(__after_prom_start)
                                         /* this includes the code being  */
                                         /* executed here.                */
 
-        LOADADDR(r0, 4f)                /* Jump to the copy of this code */
+        LOAD_REG_IMMEDIATE(r0, 4f)      /* Jump to the copy of this code */
         mtctr   r0                      /* that we just made/relocated   */
         bctr
 
-4:      LOADADDR(r5,klimit)
+4:      LOAD_REG_IMMEDIATE(r5,klimit)
         add     r5,r5,r26
         ld      r5,0(r5)                /* get the value of klimit */
         sub     r5,r5,r27
@@ -1694,7 +1695,7 @@ _GLOBAL(pmac_secondary_start)
         mtmsrd  r3                      /* RI on */
 
         /* Set up a paca value for this processor. */
-        LOADADDR(r4, paca)               /* Get base vaddr of paca array        */
+        LOAD_REG_IMMEDIATE(r4, paca)    /* Get base vaddr of paca array */
         mulli   r13,r24,PACA_SIZE        /* Calculate vaddr of right paca */
         add     r13,r13,r4              /* for this processor.          */
         mtspr   SPRN_SPRG3,r13           /* Save vaddr of paca in SPRG3 */
@@ -1731,7 +1732,7 @@ _GLOBAL(__secondary_start)
         bl      .early_setup_secondary
 
         /* Initialize the kernel stack.  Just a repeat for iSeries.      */
-        LOADADDR(r3,current_set)
+        LOAD_REG_ADDR(r3, current_set)
         sldi    r28,r24,3               /* get current_set[cpu#]         */
         ldx     r1,r3,r28
         addi    r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
@@ -1742,8 +1743,8 @@ _GLOBAL(__secondary_start)
         mtlr    r7
 
         /* enable MMU and jump to start_secondary */
-        LOADADDR(r3,.start_secondary_prolog)
-        SET_REG_TO_CONST(r4, MSR_KERNEL)
+        LOAD_REG_ADDR(r3, .start_secondary_prolog)
+        LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
 #ifdef DO_SOFT_DISABLE
         ori     r4,r4,MSR_EE
 #endif
@@ -1792,8 +1793,8 @@ _STATIC(start_here_multiplatform)
          * be detached from the kernel completely. Besides, we need
          * to clear it now for kexec-style entry.
          */
-        LOADADDR(r11,__bss_stop)
-        LOADADDR(r8,__bss_start)
+        LOAD_REG_IMMEDIATE(r11,__bss_stop)
+        LOAD_REG_IMMEDIATE(r8,__bss_start)
         sub     r11,r11,r8              /* bss size                     */
         addi    r11,r11,7               /* round up to an even double word */
         rldicl. r11,r11,61,3            /* shift right by 3             */
@@ -1831,7 +1832,7 @@ _STATIC(start_here_multiplatform)
         /* up the htab.  This is done because we have relocated the  */
         /* kernel but are still running in real mode. */
 
-        LOADADDR(r3,init_thread_union)
+        LOAD_REG_IMMEDIATE(r3,init_thread_union)
         add     r3,r3,r26
 
         /* set up a stack pointer (physical address) */
@@ -1840,14 +1841,14 @@ _STATIC(start_here_multiplatform)
         stdu    r0,-STACK_FRAME_OVERHEAD(r1)
 
         /* set up the TOC (physical address) */
-        LOADADDR(r2,__toc_start)
+        LOAD_REG_IMMEDIATE(r2,__toc_start)
         addi    r2,r2,0x4000
         addi    r2,r2,0x4000
         add     r2,r2,r26
 
-        LOADADDR(r3,cpu_specs)
+        LOAD_REG_IMMEDIATE(r3, cpu_specs)
         add     r3,r3,r26
-        LOADADDR(r4,cur_cpu_spec)
+        LOAD_REG_IMMEDIATE(r4,cur_cpu_spec)
         add     r4,r4,r26
         mr      r5,r26
         bl      .identify_cpu
@@ -1863,11 +1864,11 @@ _STATIC(start_here_multiplatform)
          * nowhere it can be initialized differently before we reach this
          * code
          */
-        LOADADDR(r27, boot_cpuid)
+        LOAD_REG_IMMEDIATE(r27, boot_cpuid)
         add     r27,r27,r26
         lwz     r27,0(r27)
 
-        LOADADDR(r24, paca)             /* Get base vaddr of paca array  */
+        LOAD_REG_IMMEDIATE(r24, paca)   /* Get base vaddr of paca array  */
         mulli   r13,r27,PACA_SIZE       /* Calculate vaddr of right paca */
         add     r13,r13,r24             /* for this processor.           */
         add     r13,r13,r26             /* convert to physical addr      */
@@ -1880,8 +1881,8 @@ _STATIC(start_here_multiplatform)
         mr      r3,r31
         bl      .early_setup
 
-        LOADADDR(r3,.start_here_common)
-        SET_REG_TO_CONST(r4, MSR_KERNEL)
+        LOAD_REG_IMMEDIATE(r3, .start_here_common)
+        LOAD_REG_IMMEDIATE(r4, MSR_KERNEL)
         mtspr   SPRN_SRR0,r3
         mtspr   SPRN_SRR1,r4
         rfid
@@ -1895,7 +1896,7 @@ _STATIC(start_here_common)
         /* The following code sets up the SP and TOC now that we are */
         /* running with translation enabled. */
 
-        LOADADDR(r3,init_thread_union)
+        LOAD_REG_IMMEDIATE(r3,init_thread_union)
 
         /* set up the stack */
         addi    r1,r3,THREAD_SIZE
@@ -1908,16 +1909,16 @@ _STATIC(start_here_common)
         li      r3,0
         bl      .do_cpu_ftr_fixups
 
-        LOADADDR(r26, boot_cpuid)
+        LOAD_REG_IMMEDIATE(r26, boot_cpuid)
         lwz     r26,0(r26)
 
-        LOADADDR(r24, paca)             /* Get base vaddr of paca array  */
+        LOAD_REG_IMMEDIATE(r24, paca)   /* Get base vaddr of paca array  */
         mulli   r13,r26,PACA_SIZE       /* Calculate vaddr of right paca */
         add     r13,r13,r24             /* for this processor.           */
         mtspr   SPRN_SPRG3,r13
 
         /* ptr to current */
-        LOADADDR(r4,init_task)
+        LOAD_REG_IMMEDIATE(r4, init_task)
         std     r4,PACACURRENT(r13)
 
         /* Load the TOC */
@@ -1940,7 +1941,7 @@ _STATIC(start_here_common)
 
 _GLOBAL(hmt_init)
 #ifdef CONFIG_HMT
-        LOADADDR(r5, hmt_thread_data)
+        LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
         mfspr   r7,SPRN_PVR
         srwi    r7,r7,16
         cmpwi   r7,0x34                 /* Pulsar  */
@@ -1961,7 +1962,7 @@ _GLOBAL(hmt_init)
         b       101f
 
 __hmt_secondary_hold:
-        LOADADDR(r5, hmt_thread_data)
+        LOAD_REG_IMMEDIATE(r5, hmt_thread_data)
         clrldi  r5,r5,4
         li      r7,0
         mfspr   r6,SPRN_PIR
@@ -1989,7 +1990,7 @@ __hmt_secondary_hold:
 
 #ifdef CONFIG_HMT
 _GLOBAL(hmt_start_secondary)
-        LOADADDR(r4,__hmt_secondary_hold)
+        LOAD_REG_IMMEDIATE(r4,__hmt_secondary_hold)
         clrldi  r4,r4,4
         mtspr   SPRN_NIADORM, r4
         mfspr   r4, SPRN_MSRDORM