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kern: optimize userspace access asm to use cheaper instruction in io memory loops
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parent
695c125721
commit
d5ebf13094
1 changed files with 27 additions and 9 deletions
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@ -596,8 +596,11 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess17ReadIoMemory32BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for read failure. */
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adr x10, 4f
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1: /* Set our return address so that on read failure we continue as though we read -1. */
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adr x30, 4f
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mov x30, x10
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/* Read the word from io. */
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ldtr w9, [x5]
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@ -643,8 +646,11 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess17ReadIoMemory16BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for read failure. */
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adr x10, 4f
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1: /* Set our return address so that on read failure we continue as though we read -1. */
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adr x30, 4f
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mov x30, x10
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/* Read the word from io. */
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ldtrh w9, [x5]
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@ -690,8 +696,11 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess16ReadIoMemory8BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for read failure. */
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adr x10, 4f
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1: /* Set our return address so that on read failure we continue as though we read -1. */
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adr x30, 4f
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mov x30, x10
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/* Read the word from io. */
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ldtrb w9, [x5]
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@ -737,11 +746,14 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory32BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for failure. */
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adr x10, 2f
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1: /* Read the word from normal memory. */
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ldtr w9, [x5]
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/* Set our return address so that on read failure we continue. */
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adr x30, 2f
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/* Set our return address so that on failure we continue. */
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mov x30, x10
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/* Write the word to io. */
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sttr w9, [x5]
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@ -779,11 +791,14 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess18WriteIoMemory16BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for failure. */
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adr x10, 2f
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1: /* Read the word from normal memory. */
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ldtrh w9, [x5]
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/* Set our return address so that on read failure we continue. */
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adr x30, 2f
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/* Set our return address so that on failure we continue. */
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mov x30, x10
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/* Write the word to io. */
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sttrh w9, [x5]
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@ -821,11 +836,14 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess17WriteIoMemory8BitEPvPKvm:
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/* Save our return address. */
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mov x8, x30
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/* Prepare return address for failure. */
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adr x10, 2f
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1: /* Read the word from normal memory. */
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ldtrb w9, [x5]
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/* Set our return address so that on read failure we continue. */
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adr x30, 2f
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/* Set our return address so that on failure we continue. */
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mov x30, x10
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/* Write the word to io. */
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sttrb w9, [x5]
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