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kernel-ark/arch/ppc/kernel/misc.S
David Gibson 25c8a78b1e [PATCH] powerpc: Fix handling of fpscr on 64-bit 
The recent merge of fpu.S broken the handling of fpscr for
ARCH=powerpc and CONFIG_PPC64=y.  FP registers could be corrupted,
leading to strange random application crashes.

The confusion arises, because the thread_struct has (and requires) a
64-bit area to save the fpscr, because we use load/store double
instructions to get it in to/out of the FPU.  However, only the low
32-bits are actually used, so we want to treat it as a 32-bit quantity
when manipulating its bits to avoid extra load/stores on 32-bit.  This
patch replaces the current definition with a structure of two 32-bit
quantities (pad and val), to clarify things as much as is possible.
The 'val' field is used when manipulating bits, the structure itself
is used when obtaining the address for loading/unloading the value
from the FPU.

While we're at it, consolidate the 4 (!) almost identical versions of
cvt_fd() and cvt_df() (arch/ppc/kernel/misc.S,
arch/ppc64/kernel/misc.S, arch/powerpc/kernel/misc_32.S,
arch/powerpc/kernel/misc_64.S) into a single version in fpu.S.  The
new version takes a pointer to thread_struct and applies the correct
offset itself, rather than a pointer to the fpscr field itself, again
to avoid confusion as to which is the correct field to use.

Finally, this patch makes ARCH=ppc64 also use the consolidated fpu.S
code, which it previously did not.

Built for G5 (ARCH=ppc64 and ARCH=powerpc), 32-bit powermac (ARCH=ppc
and ARCH=powerpc) and Walnut (ARCH=ppc, CONFIG_MATH_EMULATION=y).
Booted on G5 (ARCH=powerpc) and things which previously fell over no
longer do.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-10-27 20:48:50 +10:00

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/*
* This file contains miscellaneous low-level functions.
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/config.h>
#include <linux/sys.h>
#include <asm/unistd.h>
#include <asm/errno.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/cputable.h>
#include <asm/mmu.h>
#include <asm/ppc_asm.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
.text
.align 5
_GLOBAL(__delay)
cmpwi 0,r3,0
mtctr r3
beqlr
1: bdnz 1b
blr
/*
* Returns (address we're running at) - (address we were linked at)
* for use before the text and data are mapped to KERNELBASE.
*/
_GLOBAL(reloc_offset)
mflr r0
bl 1f
1: mflr r3
lis r4,1b@ha
addi r4,r4,1b@l
subf r3,r4,r3
mtlr r0
blr
/*
* add_reloc_offset(x) returns x + reloc_offset().
*/
_GLOBAL(add_reloc_offset)
mflr r0
bl 1f
1: mflr r5
lis r4,1b@ha
addi r4,r4,1b@l
subf r5,r4,r5
add r3,r3,r5
mtlr r0
blr
/*
* sub_reloc_offset(x) returns x - reloc_offset().
*/
_GLOBAL(sub_reloc_offset)
mflr r0
bl 1f
1: mflr r5
lis r4,1b@ha
addi r4,r4,1b@l
subf r5,r4,r5
subf r3,r5,r3
mtlr r0
blr
/*
* reloc_got2 runs through the .got2 section adding an offset
* to each entry.
*/
_GLOBAL(reloc_got2)
mflr r11
lis r7,__got2_start@ha
addi r7,r7,__got2_start@l
lis r8,__got2_end@ha
addi r8,r8,__got2_end@l
subf r8,r7,r8
srwi. r8,r8,2
beqlr
mtctr r8
bl 1f
1: mflr r0
lis r4,1b@ha
addi r4,r4,1b@l
subf r0,r4,r0
add r7,r0,r7
2: lwz r0,0(r7)
add r0,r0,r3
stw r0,0(r7)
addi r7,r7,4
bdnz 2b
mtlr r11
blr
/*
* identify_cpu,
* called with r3 = data offset and r4 = CPU number
* doesn't change r3
*/
_GLOBAL(identify_cpu)
addis r8,r3,cpu_specs@ha
addi r8,r8,cpu_specs@l
mfpvr r7
1:
lwz r5,CPU_SPEC_PVR_MASK(r8)
and r5,r5,r7
lwz r6,CPU_SPEC_PVR_VALUE(r8)
cmplw 0,r6,r5
beq 1f
addi r8,r8,CPU_SPEC_ENTRY_SIZE
b 1b
1:
addis r6,r3,cur_cpu_spec@ha
addi r6,r6,cur_cpu_spec@l
sub r8,r8,r3
stw r8,0(r6)
blr
/*
* do_cpu_ftr_fixups - goes through the list of CPU feature fixups
* and writes nop's over sections of code that don't apply for this cpu.
* r3 = data offset (not changed)
*/
_GLOBAL(do_cpu_ftr_fixups)
/* Get CPU 0 features */
addis r6,r3,cur_cpu_spec@ha
addi r6,r6,cur_cpu_spec@l
lwz r4,0(r6)
add r4,r4,r3
lwz r4,CPU_SPEC_FEATURES(r4)
/* Get the fixup table */
addis r6,r3,__start___ftr_fixup@ha
addi r6,r6,__start___ftr_fixup@l
addis r7,r3,__stop___ftr_fixup@ha
addi r7,r7,__stop___ftr_fixup@l
/* Do the fixup */
1: cmplw 0,r6,r7
bgelr
addi r6,r6,16
lwz r8,-16(r6) /* mask */
and r8,r8,r4
lwz r9,-12(r6) /* value */
cmplw 0,r8,r9
beq 1b
lwz r8,-8(r6) /* section begin */
lwz r9,-4(r6) /* section end */
subf. r9,r8,r9
beq 1b
/* write nops over the section of code */
/* todo: if large section, add a branch at the start of it */
srwi r9,r9,2
mtctr r9
add r8,r8,r3
lis r0,0x60000000@h /* nop */
3: stw r0,0(r8)
andi. r10,r4,CPU_FTR_SPLIT_ID_CACHE@l
beq 2f
dcbst 0,r8 /* suboptimal, but simpler */
sync
icbi 0,r8
2: addi r8,r8,4
bdnz 3b
sync /* additional sync needed on g4 */
isync
b 1b
/*
* call_setup_cpu - call the setup_cpu function for this cpu
* r3 = data offset, r24 = cpu number
*
* Setup function is called with:
* r3 = data offset
* r4 = ptr to CPU spec (relocated)
*/
_GLOBAL(call_setup_cpu)
addis r4,r3,cur_cpu_spec@ha
addi r4,r4,cur_cpu_spec@l
lwz r4,0(r4)
add r4,r4,r3
lwz r5,CPU_SPEC_SETUP(r4)
cmpi 0,r5,0
add r5,r5,r3
beqlr
mtctr r5
bctr
#if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx)
/* This gets called by via-pmu.c to switch the PLL selection
* on 750fx CPU. This function should really be moved to some
* other place (as most of the cpufreq code in via-pmu
*/
_GLOBAL(low_choose_750fx_pll)
/* Clear MSR:EE */
mfmsr r7
rlwinm r0,r7,0,17,15
mtmsr r0
/* If switching to PLL1, disable HID0:BTIC */
cmplwi cr0,r3,0
beq 1f
mfspr r5,SPRN_HID0
rlwinm r5,r5,0,27,25
sync
mtspr SPRN_HID0,r5
isync
sync
1:
/* Calc new HID1 value */
mfspr r4,SPRN_HID1 /* Build a HID1:PS bit from parameter */
rlwinm r5,r3,16,15,15 /* Clear out HID1:PS from value read */
rlwinm r4,r4,0,16,14 /* Could have I used rlwimi here ? */
or r4,r4,r5
mtspr SPRN_HID1,r4
/* Store new HID1 image */
rlwinm r6,r1,0,0,18
lwz r6,TI_CPU(r6)
slwi r6,r6,2
addis r6,r6,nap_save_hid1@ha
stw r4,nap_save_hid1@l(r6)
/* If switching to PLL0, enable HID0:BTIC */
cmplwi cr0,r3,0
bne 1f
mfspr r5,SPRN_HID0
ori r5,r5,HID0_BTIC
sync
mtspr SPRN_HID0,r5
isync
sync
1:
/* Return */
mtmsr r7
blr
_GLOBAL(low_choose_7447a_dfs)
/* Clear MSR:EE */
mfmsr r7
rlwinm r0,r7,0,17,15
mtmsr r0
/* Calc new HID1 value */
mfspr r4,SPRN_HID1
insrwi r4,r3,1,9 /* insert parameter into bit 9 */
sync
mtspr SPRN_HID1,r4
sync
isync
/* Return */
mtmsr r7
blr
#endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */
/*
* complement mask on the msr then "or" some values on.
* _nmask_and_or_msr(nmask, value_to_or)
*/
_GLOBAL(_nmask_and_or_msr)
mfmsr r0 /* Get current msr */
andc r0,r0,r3 /* And off the bits set in r3 (first parm) */
or r0,r0,r4 /* Or on the bits in r4 (second parm) */
SYNC /* Some chip revs have problems here... */
mtmsr r0 /* Update machine state */
isync
blr /* Done */
/*
* Flush MMU TLB
*/
_GLOBAL(_tlbia)
#if defined(CONFIG_40x)
sync /* Flush to memory before changing mapping */
tlbia
isync /* Flush shadow TLB */
#elif defined(CONFIG_44x)
li r3,0
sync
/* Load high watermark */
lis r4,tlb_44x_hwater@ha
lwz r5,tlb_44x_hwater@l(r4)
1: tlbwe r3,r3,PPC44x_TLB_PAGEID
addi r3,r3,1
cmpw 0,r3,r5
ble 1b
isync
#elif defined(CONFIG_FSL_BOOKE)
/* Invalidate all entries in TLB0 */
li r3, 0x04
tlbivax 0,3
/* Invalidate all entries in TLB1 */
li r3, 0x0c
tlbivax 0,3
/* Invalidate all entries in TLB2 */
li r3, 0x14
tlbivax 0,3
/* Invalidate all entries in TLB3 */
li r3, 0x1c
tlbivax 0,3
msync
#ifdef CONFIG_SMP
tlbsync
#endif /* CONFIG_SMP */
#else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */
#if defined(CONFIG_SMP)
rlwinm r8,r1,0,0,18
lwz r8,TI_CPU(r8)
oris r8,r8,10
mfmsr r10
SYNC
rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */
rlwinm r0,r0,0,28,26 /* clear DR */
mtmsr r0
SYNC_601
isync
lis r9,mmu_hash_lock@h
ori r9,r9,mmu_hash_lock@l
tophys(r9,r9)
10: lwarx r7,0,r9
cmpwi 0,r7,0
bne- 10b
stwcx. r8,0,r9
bne- 10b
sync
tlbia
sync
TLBSYNC
li r0,0
stw r0,0(r9) /* clear mmu_hash_lock */
mtmsr r10
SYNC_601
isync
#else /* CONFIG_SMP */
sync
tlbia
sync
#endif /* CONFIG_SMP */
#endif /* ! defined(CONFIG_40x) */
blr
/*
* Flush MMU TLB for a particular address
*/
_GLOBAL(_tlbie)
#if defined(CONFIG_40x)
tlbsx. r3, 0, r3
bne 10f
sync
/* There are only 64 TLB entries, so r3 < 64, which means bit 25 is clear.
* Since 25 is the V bit in the TLB_TAG, loading this value will invalidate
* the TLB entry. */
tlbwe r3, r3, TLB_TAG
isync
10:
#elif defined(CONFIG_44x)
mfspr r4,SPRN_MMUCR
mfspr r5,SPRN_PID /* Get PID */
rlwimi r4,r5,0,24,31 /* Set TID */
mtspr SPRN_MMUCR,r4
tlbsx. r3, 0, r3
bne 10f
sync
/* There are only 64 TLB entries, so r3 < 64,
* which means bit 22, is clear. Since 22 is
* the V bit in the TLB_PAGEID, loading this
* value will invalidate the TLB entry.
*/
tlbwe r3, r3, PPC44x_TLB_PAGEID
isync
10:
#elif defined(CONFIG_FSL_BOOKE)
rlwinm r4, r3, 0, 0, 19
ori r5, r4, 0x08 /* TLBSEL = 1 */
ori r6, r4, 0x10 /* TLBSEL = 2 */
ori r7, r4, 0x18 /* TLBSEL = 3 */
tlbivax 0, r4
tlbivax 0, r5
tlbivax 0, r6
tlbivax 0, r7
msync
#if defined(CONFIG_SMP)
tlbsync
#endif /* CONFIG_SMP */
#else /* !(CONFIG_40x || CONFIG_44x || CONFIG_FSL_BOOKE) */
#if defined(CONFIG_SMP)
rlwinm r8,r1,0,0,18
lwz r8,TI_CPU(r8)
oris r8,r8,11
mfmsr r10
SYNC
rlwinm r0,r10,0,17,15 /* clear bit 16 (MSR_EE) */
rlwinm r0,r0,0,28,26 /* clear DR */
mtmsr r0
SYNC_601
isync
lis r9,mmu_hash_lock@h
ori r9,r9,mmu_hash_lock@l
tophys(r9,r9)
10: lwarx r7,0,r9
cmpwi 0,r7,0
bne- 10b
stwcx. r8,0,r9
bne- 10b
eieio
tlbie r3
sync
TLBSYNC
li r0,0
stw r0,0(r9) /* clear mmu_hash_lock */
mtmsr r10
SYNC_601
isync
#else /* CONFIG_SMP */
tlbie r3
sync
#endif /* CONFIG_SMP */
#endif /* ! CONFIG_40x */
blr
/*
* Flush instruction cache.
* This is a no-op on the 601.
*/
_GLOBAL(flush_instruction_cache)
#if defined(CONFIG_8xx)
isync
lis r5, IDC_INVALL@h
mtspr SPRN_IC_CST, r5
#elif defined(CONFIG_4xx)
#ifdef CONFIG_403GCX
li r3, 512
mtctr r3
lis r4, KERNELBASE@h
1: iccci 0, r4
addi r4, r4, 16
bdnz 1b
#else
lis r3, KERNELBASE@h
iccci 0,r3
#endif
#elif CONFIG_FSL_BOOKE
BEGIN_FTR_SECTION
mfspr r3,SPRN_L1CSR0
ori r3,r3,L1CSR0_CFI|L1CSR0_CLFC
/* msync; isync recommended here */
mtspr SPRN_L1CSR0,r3
isync
blr
END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE)
mfspr r3,SPRN_L1CSR1
ori r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
mtspr SPRN_L1CSR1,r3
#else
mfspr r3,SPRN_PVR
rlwinm r3,r3,16,16,31
cmpwi 0,r3,1
beqlr /* for 601, do nothing */
/* 603/604 processor - use invalidate-all bit in HID0 */
mfspr r3,SPRN_HID0
ori r3,r3,HID0_ICFI
mtspr SPRN_HID0,r3
#endif /* CONFIG_8xx/4xx */
isync
blr
/*
* Write any modified data cache blocks out to memory
* and invalidate the corresponding instruction cache blocks.
* This is a no-op on the 601.
*
* flush_icache_range(unsigned long start, unsigned long stop)
*/
_GLOBAL(flush_icache_range)
BEGIN_FTR_SECTION
blr /* for 601, do nothing */
END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE)
li r5,L1_CACHE_BYTES-1
andc r3,r3,r5
subf r4,r3,r4
add r4,r4,r5
srwi. r4,r4,L1_CACHE_SHIFT
beqlr
mtctr r4
mr r6,r3
1: dcbst 0,r3
addi r3,r3,L1_CACHE_BYTES
bdnz 1b
sync /* wait for dcbst's to get to ram */
mtctr r4
2: icbi 0,r6
addi r6,r6,L1_CACHE_BYTES
bdnz 2b
sync /* additional sync needed on g4 */
isync
blr
/*
* Write any modified data cache blocks out to memory.
* Does not invalidate the corresponding cache lines (especially for
* any corresponding instruction cache).
*
* clean_dcache_range(unsigned long start, unsigned long stop)
*/
_GLOBAL(clean_dcache_range)
li r5,L1_CACHE_BYTES-1
andc r3,r3,r5
subf r4,r3,r4
add r4,r4,r5
srwi. r4,r4,L1_CACHE_SHIFT
beqlr
mtctr r4
1: dcbst 0,r3
addi r3,r3,L1_CACHE_BYTES
bdnz 1b
sync /* wait for dcbst's to get to ram */
blr
/*
* Write any modified data cache blocks out to memory and invalidate them.
* Does not invalidate the corresponding instruction cache blocks.
*
* flush_dcache_range(unsigned long start, unsigned long stop)
*/
_GLOBAL(flush_dcache_range)
li r5,L1_CACHE_BYTES-1
andc r3,r3,r5
subf r4,r3,r4
add r4,r4,r5
srwi. r4,r4,L1_CACHE_SHIFT
beqlr
mtctr r4
1: dcbf 0,r3
addi r3,r3,L1_CACHE_BYTES
bdnz 1b
sync /* wait for dcbst's to get to ram */
blr
/*
* Like above, but invalidate the D-cache. This is used by the 8xx
* to invalidate the cache so the PPC core doesn't get stale data
* from the CPM (no cache snooping here :-).
*
* invalidate_dcache_range(unsigned long start, unsigned long stop)
*/
_GLOBAL(invalidate_dcache_range)
li r5,L1_CACHE_BYTES-1
andc r3,r3,r5
subf r4,r3,r4
add r4,r4,r5
srwi. r4,r4,L1_CACHE_SHIFT
beqlr
mtctr r4
1: dcbi 0,r3
addi r3,r3,L1_CACHE_BYTES
bdnz 1b
sync /* wait for dcbi's to get to ram */
blr
#ifdef CONFIG_NOT_COHERENT_CACHE
/*
* 40x cores have 8K or 16K dcache and 32 byte line size.
* 44x has a 32K dcache and 32 byte line size.
* 8xx has 1, 2, 4, 8K variants.
* For now, cover the worst case of the 44x.
* Must be called with external interrupts disabled.
*/
#define CACHE_NWAYS 64
#define CACHE_NLINES 16
_GLOBAL(flush_dcache_all)
li r4, (2 * CACHE_NWAYS * CACHE_NLINES)
mtctr r4
lis r5, KERNELBASE@h
1: lwz r3, 0(r5) /* Load one word from every line */
addi r5, r5, L1_CACHE_BYTES
bdnz 1b
blr
#endif /* CONFIG_NOT_COHERENT_CACHE */
/*
* Flush a particular page from the data cache to RAM.
* Note: this is necessary because the instruction cache does *not*
* snoop from the data cache.
* This is a no-op on the 601 which has a unified cache.
*
* void __flush_dcache_icache(void *page)
*/
_GLOBAL(__flush_dcache_icache)
BEGIN_FTR_SECTION
blr /* for 601, do nothing */
END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE)
rlwinm r3,r3,0,0,19 /* Get page base address */
li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */
mtctr r4
mr r6,r3
0: dcbst 0,r3 /* Write line to ram */
addi r3,r3,L1_CACHE_BYTES
bdnz 0b
sync
mtctr r4
1: icbi 0,r6
addi r6,r6,L1_CACHE_BYTES
bdnz 1b
sync
isync
blr
/*
* Flush a particular page from the data cache to RAM, identified
* by its physical address. We turn off the MMU so we can just use
* the physical address (this may be a highmem page without a kernel
* mapping).
*
* void __flush_dcache_icache_phys(unsigned long physaddr)
*/
_GLOBAL(__flush_dcache_icache_phys)
BEGIN_FTR_SECTION
blr /* for 601, do nothing */
END_FTR_SECTION_IFCLR(CPU_FTR_SPLIT_ID_CACHE)
mfmsr r10
rlwinm r0,r10,0,28,26 /* clear DR */
mtmsr r0
isync
rlwinm r3,r3,0,0,19 /* Get page base address */
li r4,4096/L1_CACHE_BYTES /* Number of lines in a page */
mtctr r4
mr r6,r3
0: dcbst 0,r3 /* Write line to ram */
addi r3,r3,L1_CACHE_BYTES
bdnz 0b
sync
mtctr r4
1: icbi 0,r6
addi r6,r6,L1_CACHE_BYTES
bdnz 1b
sync
mtmsr r10 /* restore DR */
isync
blr
/*
* Clear pages using the dcbz instruction, which doesn't cause any
* memory traffic (except to write out any cache lines which get
* displaced). This only works on cacheable memory.
*
* void clear_pages(void *page, int order) ;
*/
_GLOBAL(clear_pages)
li r0,4096/L1_CACHE_BYTES
slw r0,r0,r4
mtctr r0
#ifdef CONFIG_8xx
li r4, 0
1: stw r4, 0(r3)
stw r4, 4(r3)
stw r4, 8(r3)
stw r4, 12(r3)
#else
1: dcbz 0,r3
#endif
addi r3,r3,L1_CACHE_BYTES
bdnz 1b
blr
/*
* Copy a whole page. We use the dcbz instruction on the destination
* to reduce memory traffic (it eliminates the unnecessary reads of
* the destination into cache). This requires that the destination
* is cacheable.
*/
#define COPY_16_BYTES \
lwz r6,4(r4); \
lwz r7,8(r4); \
lwz r8,12(r4); \
lwzu r9,16(r4); \
stw r6,4(r3); \
stw r7,8(r3); \
stw r8,12(r3); \
stwu r9,16(r3)
_GLOBAL(copy_page)
addi r3,r3,-4
addi r4,r4,-4
#ifdef CONFIG_8xx
/* don't use prefetch on 8xx */
li r0,4096/L1_CACHE_BYTES
mtctr r0
1: COPY_16_BYTES
bdnz 1b
blr
#else /* not 8xx, we can prefetch */
li r5,4
#if MAX_COPY_PREFETCH > 1
li r0,MAX_COPY_PREFETCH
li r11,4
mtctr r0
11: dcbt r11,r4
addi r11,r11,L1_CACHE_BYTES
bdnz 11b
#else /* MAX_COPY_PREFETCH == 1 */
dcbt r5,r4
li r11,L1_CACHE_BYTES+4
#endif /* MAX_COPY_PREFETCH */
li r0,4096/L1_CACHE_BYTES - MAX_COPY_PREFETCH
crclr 4*cr0+eq
2:
mtctr r0
1:
dcbt r11,r4
dcbz r5,r3
COPY_16_BYTES
#if L1_CACHE_BYTES >= 32
COPY_16_BYTES
#if L1_CACHE_BYTES >= 64
COPY_16_BYTES
COPY_16_BYTES
#if L1_CACHE_BYTES >= 128
COPY_16_BYTES
COPY_16_BYTES
COPY_16_BYTES
COPY_16_BYTES
#endif
#endif
#endif
bdnz 1b
beqlr
crnot 4*cr0+eq,4*cr0+eq
li r0,MAX_COPY_PREFETCH
li r11,4
b 2b
#endif /* CONFIG_8xx */
/*
* void atomic_clear_mask(atomic_t mask, atomic_t *addr)
* void atomic_set_mask(atomic_t mask, atomic_t *addr);
*/
_GLOBAL(atomic_clear_mask)
10: lwarx r5,0,r4
andc r5,r5,r3
PPC405_ERR77(0,r4)
stwcx. r5,0,r4
bne- 10b
blr
_GLOBAL(atomic_set_mask)
10: lwarx r5,0,r4
or r5,r5,r3
PPC405_ERR77(0,r4)
stwcx. r5,0,r4
bne- 10b
blr
/*
* I/O string operations
*
* insb(port, buf, len)
* outsb(port, buf, len)
* insw(port, buf, len)
* outsw(port, buf, len)
* insl(port, buf, len)
* outsl(port, buf, len)
* insw_ns(port, buf, len)
* outsw_ns(port, buf, len)
* insl_ns(port, buf, len)
* outsl_ns(port, buf, len)
*
* The *_ns versions don't do byte-swapping.
*/
_GLOBAL(_insb)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,1
blelr-
00: lbz r5,0(r3)
eieio
stbu r5,1(r4)
bdnz 00b
blr
_GLOBAL(_outsb)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,1
blelr-
00: lbzu r5,1(r4)
stb r5,0(r3)
eieio
bdnz 00b
blr
_GLOBAL(_insw)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,2
blelr-
00: lhbrx r5,0,r3
eieio
sthu r5,2(r4)
bdnz 00b
blr
_GLOBAL(_outsw)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,2
blelr-
00: lhzu r5,2(r4)
eieio
sthbrx r5,0,r3
bdnz 00b
blr
_GLOBAL(_insl)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,4
blelr-
00: lwbrx r5,0,r3
eieio
stwu r5,4(r4)
bdnz 00b
blr
_GLOBAL(_outsl)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,4
blelr-
00: lwzu r5,4(r4)
stwbrx r5,0,r3
eieio
bdnz 00b
blr
_GLOBAL(__ide_mm_insw)
_GLOBAL(_insw_ns)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,2
blelr-
00: lhz r5,0(r3)
eieio
sthu r5,2(r4)
bdnz 00b
blr
_GLOBAL(__ide_mm_outsw)
_GLOBAL(_outsw_ns)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,2
blelr-
00: lhzu r5,2(r4)
sth r5,0(r3)
eieio
bdnz 00b
blr
_GLOBAL(__ide_mm_insl)
_GLOBAL(_insl_ns)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,4
blelr-
00: lwz r5,0(r3)
eieio
stwu r5,4(r4)
bdnz 00b
blr
_GLOBAL(__ide_mm_outsl)
_GLOBAL(_outsl_ns)
cmpwi 0,r5,0
mtctr r5
subi r4,r4,4
blelr-
00: lwzu r5,4(r4)
stw r5,0(r3)
eieio
bdnz 00b
blr
/*
* Extended precision shifts.
*
* Updated to be valid for shift counts from 0 to 63 inclusive.
* -- Gabriel
*
* R3/R4 has 64 bit value
* R5 has shift count
* result in R3/R4
*
* ashrdi3: arithmetic right shift (sign propagation)
* lshrdi3: logical right shift
* ashldi3: left shift
*/
_GLOBAL(__ashrdi3)
subfic r6,r5,32
srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
addi r7,r5,32 # could be xori, or addi with -32
slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
rlwinm r8,r7,0,32 # t3 = (count < 32) ? 32 : 0
sraw r7,r3,r7 # t2 = MSW >> (count-32)
or r4,r4,r6 # LSW |= t1
slw r7,r7,r8 # t2 = (count < 32) ? 0 : t2
sraw r3,r3,r5 # MSW = MSW >> count
or r4,r4,r7 # LSW |= t2
blr
_GLOBAL(__ashldi3)
subfic r6,r5,32
slw r3,r3,r5 # MSW = count > 31 ? 0 : MSW << count
addi r7,r5,32 # could be xori, or addi with -32
srw r6,r4,r6 # t1 = count > 31 ? 0 : LSW >> (32-count)
slw r7,r4,r7 # t2 = count < 32 ? 0 : LSW << (count-32)
or r3,r3,r6 # MSW |= t1
slw r4,r4,r5 # LSW = LSW << count
or r3,r3,r7 # MSW |= t2
blr
_GLOBAL(__lshrdi3)
subfic r6,r5,32
srw r4,r4,r5 # LSW = count > 31 ? 0 : LSW >> count
addi r7,r5,32 # could be xori, or addi with -32
slw r6,r3,r6 # t1 = count > 31 ? 0 : MSW << (32-count)
srw r7,r3,r7 # t2 = count < 32 ? 0 : MSW >> (count-32)
or r4,r4,r6 # LSW |= t1
srw r3,r3,r5 # MSW = MSW >> count
or r4,r4,r7 # LSW |= t2
blr
_GLOBAL(abs)
srawi r4,r3,31
xor r3,r3,r4
sub r3,r3,r4
blr
_GLOBAL(_get_SP)
mr r3,r1 /* Close enough */
blr
/*
* Create a kernel thread
* kernel_thread(fn, arg, flags)
*/
_GLOBAL(kernel_thread)
stwu r1,-16(r1)
stw r30,8(r1)
stw r31,12(r1)
mr r30,r3 /* function */
mr r31,r4 /* argument */
ori r3,r5,CLONE_VM /* flags */
oris r3,r3,CLONE_UNTRACED>>16
li r4,0 /* new sp (unused) */
li r0,__NR_clone
sc
cmpwi 0,r3,0 /* parent or child? */
bne 1f /* return if parent */
li r0,0 /* make top-level stack frame */
stwu r0,-16(r1)
mtlr r30 /* fn addr in lr */
mr r3,r31 /* load arg and call fn */
PPC440EP_ERR42
blrl
li r0,__NR_exit /* exit if function returns */
li r3,0
sc
1: lwz r30,8(r1)
lwz r31,12(r1)
addi r1,r1,16
blr
/*
* This routine is just here to keep GCC happy - sigh...
*/
_GLOBAL(__main)
blr
#define SYSCALL(name) \
_GLOBAL(name) \
li r0,__NR_##name; \
sc; \
bnslr; \
lis r4,errno@ha; \
stw r3,errno@l(r4); \
li r3,-1; \
blr
SYSCALL(execve)
/* Why isn't this a) automatic, b) written in 'C'? */
.data
.align 4
_GLOBAL(sys_call_table)
.long sys_restart_syscall /* 0 */
.long sys_exit
.long ppc_fork
.long sys_read
.long sys_write
.long sys_open /* 5 */
.long sys_close
.long sys_waitpid
.long sys_creat
.long sys_link
.long sys_unlink /* 10 */
.long sys_execve
.long sys_chdir
.long sys_time
.long sys_mknod
.long sys_chmod /* 15 */
.long sys_lchown
.long sys_ni_syscall /* old break syscall holder */
.long sys_stat
.long sys_lseek
.long sys_getpid /* 20 */
.long sys_mount
.long sys_oldumount
.long sys_setuid
.long sys_getuid
.long sys_stime /* 25 */
.long sys_ptrace
.long sys_alarm
.long sys_fstat
.long sys_pause
.long sys_utime /* 30 */
.long sys_ni_syscall /* old stty syscall holder */
.long sys_ni_syscall /* old gtty syscall holder */
.long sys_access
.long sys_nice
.long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
.long sys_sync
.long sys_kill
.long sys_rename
.long sys_mkdir
.long sys_rmdir /* 40 */
.long sys_dup
.long sys_pipe
.long sys_times
.long sys_ni_syscall /* old prof syscall holder */
.long sys_brk /* 45 */
.long sys_setgid
.long sys_getgid
.long sys_signal
.long sys_geteuid
.long sys_getegid /* 50 */
.long sys_acct
.long sys_umount /* recycled never used phys() */
.long sys_ni_syscall /* old lock syscall holder */
.long sys_ioctl
.long sys_fcntl /* 55 */
.long sys_ni_syscall /* old mpx syscall holder */
.long sys_setpgid
.long sys_ni_syscall /* old ulimit syscall holder */
.long sys_olduname
.long sys_umask /* 60 */
.long sys_chroot
.long sys_ustat
.long sys_dup2
.long sys_getppid
.long sys_getpgrp /* 65 */
.long sys_setsid
.long sys_sigaction
.long sys_sgetmask
.long sys_ssetmask
.long sys_setreuid /* 70 */
.long sys_setregid
.long ppc_sigsuspend
.long sys_sigpending
.long sys_sethostname
.long sys_setrlimit /* 75 */
.long sys_old_getrlimit
.long sys_getrusage
.long sys_gettimeofday
.long sys_settimeofday
.long sys_getgroups /* 80 */
.long sys_setgroups
.long ppc_select
.long sys_symlink
.long sys_lstat
.long sys_readlink /* 85 */
.long sys_uselib
.long sys_swapon
.long sys_reboot
.long old_readdir
.long sys_mmap /* 90 */
.long sys_munmap
.long sys_truncate
.long sys_ftruncate
.long sys_fchmod
.long sys_fchown /* 95 */
.long sys_getpriority
.long sys_setpriority
.long sys_ni_syscall /* old profil syscall holder */
.long sys_statfs
.long sys_fstatfs /* 100 */
.long sys_ni_syscall
.long sys_socketcall
.long sys_syslog
.long sys_setitimer
.long sys_getitimer /* 105 */
.long sys_newstat
.long sys_newlstat
.long sys_newfstat
.long sys_uname
.long sys_ni_syscall /* 110 */
.long sys_vhangup
.long sys_ni_syscall /* old 'idle' syscall */
.long sys_ni_syscall
.long sys_wait4
.long sys_swapoff /* 115 */
.long sys_sysinfo
.long sys_ipc
.long sys_fsync
.long sys_sigreturn
.long ppc_clone /* 120 */
.long sys_setdomainname
.long sys_newuname
.long sys_ni_syscall
.long sys_adjtimex
.long sys_mprotect /* 125 */
.long sys_sigprocmask
.long sys_ni_syscall /* old sys_create_module */
.long sys_init_module
.long sys_delete_module
.long sys_ni_syscall /* old sys_get_kernel_syms */ /* 130 */
.long sys_quotactl
.long sys_getpgid
.long sys_fchdir
.long sys_bdflush
.long sys_sysfs /* 135 */
.long sys_personality
.long sys_ni_syscall /* for afs_syscall */
.long sys_setfsuid
.long sys_setfsgid
.long sys_llseek /* 140 */
.long sys_getdents
.long ppc_select
.long sys_flock
.long sys_msync
.long sys_readv /* 145 */
.long sys_writev
.long sys_getsid
.long sys_fdatasync
.long sys_sysctl
.long sys_mlock /* 150 */
.long sys_munlock
.long sys_mlockall
.long sys_munlockall
.long sys_sched_setparam
.long sys_sched_getparam /* 155 */
.long sys_sched_setscheduler
.long sys_sched_getscheduler
.long sys_sched_yield
.long sys_sched_get_priority_max
.long sys_sched_get_priority_min /* 160 */
.long sys_sched_rr_get_interval
.long sys_nanosleep
.long sys_mremap
.long sys_setresuid
.long sys_getresuid /* 165 */
.long sys_ni_syscall /* old sys_query_module */
.long sys_poll
.long sys_nfsservctl
.long sys_setresgid
.long sys_getresgid /* 170 */
.long sys_prctl
.long sys_rt_sigreturn
.long sys_rt_sigaction
.long sys_rt_sigprocmask
.long sys_rt_sigpending /* 175 */
.long sys_rt_sigtimedwait
.long sys_rt_sigqueueinfo
.long ppc_rt_sigsuspend
.long sys_pread64
.long sys_pwrite64 /* 180 */
.long sys_chown
.long sys_getcwd
.long sys_capget
.long sys_capset
.long sys_sigaltstack /* 185 */
.long sys_sendfile
.long sys_ni_syscall /* streams1 */
.long sys_ni_syscall /* streams2 */
.long ppc_vfork
.long sys_getrlimit /* 190 */
.long sys_readahead
.long sys_mmap2
.long sys_truncate64
.long sys_ftruncate64
.long sys_stat64 /* 195 */
.long sys_lstat64
.long sys_fstat64
.long sys_pciconfig_read
.long sys_pciconfig_write
.long sys_pciconfig_iobase /* 200 */
.long sys_ni_syscall /* 201 - reserved - MacOnLinux - new */
.long sys_getdents64
.long sys_pivot_root
.long sys_fcntl64
.long sys_madvise /* 205 */
.long sys_mincore
.long sys_gettid
.long sys_tkill
.long sys_setxattr
.long sys_lsetxattr /* 210 */
.long sys_fsetxattr
.long sys_getxattr
.long sys_lgetxattr
.long sys_fgetxattr
.long sys_listxattr /* 215 */
.long sys_llistxattr
.long sys_flistxattr
.long sys_removexattr
.long sys_lremovexattr
.long sys_fremovexattr /* 220 */
.long sys_futex
.long sys_sched_setaffinity
.long sys_sched_getaffinity
.long sys_ni_syscall
.long sys_ni_syscall /* 225 - reserved for Tux */
.long sys_sendfile64
.long sys_io_setup
.long sys_io_destroy
.long sys_io_getevents
.long sys_io_submit /* 230 */
.long sys_io_cancel
.long sys_set_tid_address
.long sys_fadvise64
.long sys_exit_group
.long sys_lookup_dcookie /* 235 */
.long sys_epoll_create
.long sys_epoll_ctl
.long sys_epoll_wait
.long sys_remap_file_pages
.long sys_timer_create /* 240 */
.long sys_timer_settime
.long sys_timer_gettime
.long sys_timer_getoverrun
.long sys_timer_delete
.long sys_clock_settime /* 245 */
.long sys_clock_gettime
.long sys_clock_getres
.long sys_clock_nanosleep
.long ppc_swapcontext
.long sys_tgkill /* 250 */
.long sys_utimes
.long sys_statfs64
.long sys_fstatfs64
.long ppc_fadvise64_64
.long sys_ni_syscall /* 255 - rtas (used on ppc64) */
.long sys_debug_setcontext
.long sys_ni_syscall /* 257 reserved for vserver */
.long sys_ni_syscall /* 258 reserved for new sys_remap_file_pages */
.long sys_ni_syscall /* 259 reserved for new sys_mbind */
.long sys_ni_syscall /* 260 reserved for new sys_get_mempolicy */
.long sys_ni_syscall /* 261 reserved for new sys_set_mempolicy */
.long sys_mq_open
.long sys_mq_unlink
.long sys_mq_timedsend
.long sys_mq_timedreceive /* 265 */
.long sys_mq_notify
.long sys_mq_getsetattr
.long sys_kexec_load
.long sys_add_key
.long sys_request_key /* 270 */
.long sys_keyctl
.long sys_waitid
.long sys_ioprio_set
.long sys_ioprio_get
.long sys_inotify_init /* 275 */
.long sys_inotify_add_watch
.long sys_inotify_rm_watch
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