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tests/mmu: Add a test for a faulting load near the end of a page

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This tests for the bug where a load near the end of a page, if the load
faults and the following page isn't mapped, could cause a DSI followed
incorrectly by an ISI shortly afterwards.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2026-01-31 16:08:22 +11:00
parent 41e341f260
commit a1d83ba91a
4 changed files with 109 additions and 59 deletions
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76
tests/mmu/head.S
View File

@@ -23,6 +23,7 @@
ori r,r, (e)@l;
.section ".head","ax"
.machine "power10"
/*
* Microwatt currently enters in LE mode at 0x0, so we don't need to
@@ -45,82 +46,97 @@ _start:
2: LOAD_IMM64(%r1,__stack_top)
li %r0,0
stdu %r0,-16(%r1)
pla %r9,3f-.
mtsprg1 %r9
LOAD_IMM64(%r12, main)
mtctr %r12
bctrl
attn // terminate on exit
3: attn // terminate on exit
b .
/* Read a location with translation on */
.globl test_read
test_read:
mfsprg1 %r10
pla %r9,1f-.
mtsprg1 %r9
mfmsr %r9
ori %r8,%r9,0x10 /* set MSR_DR */
mtmsrd %r8,0
mr %r6,%r3
li %r3,0
ld %r5,0(%r6)
li %r3,1
/* land here if DSI occurred */
mtmsrd %r9,0
1: /* land here if DSI occurred */
std %r5,0(%r4)
mtsprg1 %r10
blr
/* Write a location with translation on */
.globl test_write
test_write:
mfsprg1 %r10
pla %r9,1f-.
mtsprg1 %r9
mfmsr %r9
ori %r8,%r9,0x10 /* set MSR_DR */
mtmsrd %r8,0
mr %r6,%r3
li %r3,0
std %r4,0(%r6)
li %r3,1
/* land here if DSI occurred */
mtmsrd %r9,0
1: /* land here if DSI occurred */
mtsprg1 %r10
blr
/* Do a dcbz with translation on */
.globl test_dcbz
test_dcbz:
mfsprg1 %r10
pla %r9,1f-.
mtsprg1 %r9
mfmsr %r9
ori %r8,%r9,0x10 /* set MSR_DR */
mtmsrd %r8,0
mr %r6,%r3
li %r3,0
dcbz 0,%r6
li %r3,1
/* land here if DSI occurred */
mtmsrd %r9,0
1: /* land here if DSI occurred */
mtsprg1 %r10
blr
.globl test_exec
test_exec:
mfsprg1 %r10
pla %r9,1f-.
mtsprg1 %r9
mtsrr0 %r4
mtsrr1 %r5
rfid
1: /* land here if an interrupt occurred */
mtsprg1 %r10
blr
#define EXCEPTION(nr) \
.= nr ;\
attn
/* DSI vector - skip the failing instruction + the next one */
/* DSI vector - set r3 to 0x300, jump to addr in SPRG1 */
. = 0x300
mtsprg0 %r10
mfsrr0 %r10
addi %r10,%r10,8
mtsrr0 %r10
rfid
li %r3,0x300
mfsprg1 %r9
mtctr %r9
bctr
EXCEPTION(0x380)
/*
* ISI vector - jump to LR to return from the test,
* with r3 cleared
*/
/* ISI vector - set r3 to 0x400, jump to addr in SPRG1 */
. = 0x400
li %r3,0
blr
li %r3,0x400
mfsprg1 %r9
mtctr %r9
bctr
/* More exception stubs */
EXCEPTION(0x480)
@@ -138,7 +154,9 @@ test_exec:
* may have been set.
*/
. = 0xc00
blr
mfsprg1 %r9
mtctr %r9
bctr
EXCEPTION(0xd00)
EXCEPTION(0xe00)
@@ -162,12 +180,13 @@ test_exec:
test_start:
nop
nop
cmpdi %r3,1
mr %r6,%r3
li %r3,0
cmpdi %r6,1
beq test_1
cmpdi %r3,2
cmpdi %r6,2
beq test_2
test_return:
li %r3,1
sc
. = 0x1ff8
@@ -177,3 +196,14 @@ test_1: b test_return
/* test flowing from one page to the next */
test_2: nop
b test_return
. = 0x2fe8
/* test generating an interrupt just before an instruction page fault */
.globl test_2_faults
test_2_faults:
nop
nop
mr %r6,%r3
li %r3,0
lwz %r7,0(%r6)
ld %r7,0(%r7)

91
tests/mmu/mmu.c
View File

@@ -192,7 +192,7 @@ int mmu_test_1(void)
long val;
/* this should fail */
if (test_read(ptr, &val, 0xdeadbeefd00d))
if (!test_read(ptr, &val, 0xdeadbeefd00d))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeefd00d)
@@ -215,7 +215,7 @@ int mmu_test_2(void)
/* initialize the memory content */
mem[33] = 0xbadc0ffee;
/* this should succeed and be a cache miss */
if (!test_read(&ptr[33], &val, 0xdeadbeefd00d))
if (test_read(&ptr[33], &val, 0xdeadbeefd00d))
return 1;
/* dest reg of load should have the value written */
if (val != 0xbadc0ffee)
@@ -223,13 +223,13 @@ int mmu_test_2(void)
/* load a second TLB entry in the same set as the first */
map(ptr2, mem, DFLT_PERM);
/* this should succeed and be a cache hit */
if (!test_read(&ptr2[33], &val, 0xdeadbeefd00d))
if (test_read(&ptr2[33], &val, 0xdeadbeefd00d))
return 3;
/* dest reg of load should have the value written */
if (val != 0xbadc0ffee)
return 4;
/* check that the first entry still works */
if (!test_read(&ptr[33], &val, 0xdeadbeefd00d))
if (test_read(&ptr[33], &val, 0xdeadbeefd00d))
return 5;
if (val != 0xbadc0ffee)
return 6;
@@ -247,7 +247,7 @@ int mmu_test_3(void)
/* initialize the memory content */
mem[45] = 0xfee1800d4ea;
/* this should succeed and be a cache miss */
if (!test_read(&ptr[45], &val, 0xdeadbeefd0d0))
if (test_read(&ptr[45], &val, 0xdeadbeefd0d0))
return 1;
/* dest reg of load should have the value written */
if (val != 0xfee1800d4ea)
@@ -255,7 +255,7 @@ int mmu_test_3(void)
/* remove the PTE */
unmap(ptr);
/* this should fail */
if (test_read(&ptr[45], &val, 0xdeadbeefd0d0))
if (!test_read(&ptr[45], &val, 0xdeadbeefd0d0))
return 3;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeefd0d0)
@@ -278,7 +278,7 @@ int mmu_test_4(void)
/* initialize the memory content */
mem[27] = 0xf00f00f00f00;
/* this should succeed and be a cache miss */
if (!test_write(&ptr[27], 0xe44badc0ffee))
if (test_write(&ptr[27], 0xe44badc0ffee))
return 1;
/* memory should now have the value written */
if (mem[27] != 0xe44badc0ffee)
@@ -286,14 +286,14 @@ int mmu_test_4(void)
/* load a second TLB entry in the same set as the first */
map(ptr2, mem, DFLT_PERM);
/* this should succeed and be a cache hit */
if (!test_write(&ptr2[27], 0x6e11ae))
if (test_write(&ptr2[27], 0x6e11ae))
return 3;
/* memory should have the value written */
if (mem[27] != 0x6e11ae)
return 4;
/* check that the first entry still exists */
/* (assumes TLB is 2-way associative or more) */
if (!test_read(&ptr[27], &val, 0xdeadbeefd00d))
if (test_read(&ptr[27], &val, 0xdeadbeefd00d))
return 5;
if (val != 0x6e11ae)
return 6;
@@ -309,7 +309,7 @@ int mmu_test_5(void)
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* this should fail */
if (test_read(ptr, &val, 0xdeadbeef0dd0))
if (!test_read(ptr, &val, 0xdeadbeef0dd0))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadbeef0dd0)
@@ -330,7 +330,7 @@ int mmu_test_6(void)
/* initialize memory */
*mem = 0x123456789abcdef0;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd0))
if (!test_write(ptr, 0xdeadbeef0dd0))
return 1;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != ((long)ptr & ~0xfff) + 0x1000 || mfspr(DSISR) != 0x42000000)
@@ -348,7 +348,7 @@ int mmu_test_7(void)
/* create PTE without R or C */
map(ptr, mem, PERM_RD | PERM_WR);
/* this should fail */
if (test_read(ptr, &val, 0xdeadd00dbeef))
if (!test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadd00dbeef)
@@ -357,7 +357,7 @@ int mmu_test_7(void)
if (mfspr(DAR) != (long) ptr || mfspr(DSISR) != 0x00040000)
return 3;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd0))
if (!test_write(ptr, 0xdeadbeef0dd0))
return 4;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != (long)ptr || mfspr(DSISR) != 0x02040000)
@@ -378,10 +378,10 @@ int mmu_test_8(void)
/* create PTE with R but not C */
map(ptr, mem, REF | PERM_RD | PERM_WR);
/* this should succeed */
if (!test_read(ptr, &val, 0xdeadd00dbeef))
if (test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
if (!test_write(ptr, 0xdeadbeef0dd1))
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != (long)ptr || mfspr(DSISR) != 0x02040000)
@@ -402,7 +402,7 @@ int mmu_test_9(void)
/* create PTE without read or write permission */
map(ptr, mem, REF);
/* this should fail */
if (test_read(ptr, &val, 0xdeadd00dbeef))
if (!test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* dest reg of load should be unchanged */
if (val != 0xdeadd00dbeef)
@@ -411,7 +411,7 @@ int mmu_test_9(void)
if (mfspr(DAR) != (long) ptr || mfspr(DSISR) != 0x08000000)
return 3;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
if (!test_write(ptr, 0xdeadbeef0dd1))
return 4;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != (long)ptr || mfspr(DSISR) != 0x0a000000)
@@ -432,10 +432,10 @@ int mmu_test_10(void)
/* create PTE with read but not write permission */
map(ptr, mem, REF | PERM_RD);
/* this should succeed */
if (!test_read(ptr, &val, 0xdeadd00dbeef))
if (test_read(ptr, &val, 0xdeadd00dbeef))
return 1;
/* this should fail */
if (test_write(ptr, 0xdeadbeef0dd1))
if (!test_write(ptr, 0xdeadbeef0dd1))
return 2;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != (long)ptr || mfspr(DSISR) != 0x0a000000)
@@ -451,7 +451,7 @@ int mmu_test_11(void)
unsigned long ptr = 0x523000;
/* this should fail */
if (test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != (long) ptr ||
@@ -469,12 +469,12 @@ int mmu_test_12(void)
/* create PTE */
map((void *)ptr, (void *)mem, PERM_EX | REF);
/* this should succeed and be a cache miss */
if (!test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* create a second PTE */
map((void *)ptr2, (void *)mem, PERM_EX | REF);
/* this should succeed and be a cache hit */
if (!test_exec(0, ptr2, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (test_exec(0, ptr2, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 2;
return 0;
}
@@ -488,14 +488,14 @@ int mmu_test_13(void)
/* create a PTE */
map((void *)ptr, (void *)mem, PERM_EX | REF);
/* this should succeed */
if (!test_exec(1, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (test_exec(1, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* invalidate the PTE */
unmap((void *)ptr);
/* install a second PTE */
map((void *)ptr2, (void *)mem, PERM_EX | REF);
/* this should fail */
if (test_exec(1, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(1, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 2;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != (long) ptr ||
@@ -514,7 +514,7 @@ int mmu_test_14(void)
/* create a PTE */
map((void *)ptr, (void *)mem, PERM_EX | REF);
/* this should fail due to second page not being mapped */
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != ptr2 ||
@@ -523,7 +523,7 @@ int mmu_test_14(void)
/* create a PTE for the second page */
map((void *)ptr2, (void *)mem2, PERM_EX | REF);
/* this should succeed */
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 3;
return 0;
}
@@ -536,7 +536,7 @@ int mmu_test_15(void)
/* create a PTE without execute permission */
map((void *)ptr, (void *)mem, DFLT_PERM);
/* this should fail */
if (test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(0, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != ptr ||
@@ -557,7 +557,7 @@ int mmu_test_16(void)
/* create a PTE for the second page without execute permission */
map((void *)ptr2, (void *)mem2, PERM_RD | REF);
/* this should fail due to second page being no-execute */
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != ptr2 ||
@@ -566,7 +566,7 @@ int mmu_test_16(void)
/* create a PTE for the second page with execute permission */
map((void *)ptr2, (void *)mem2, PERM_RD | PERM_EX | REF);
/* this should succeed */
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 3;
return 0;
}
@@ -579,7 +579,7 @@ int mmu_test_17(void)
/* create a PTE without the ref bit set */
map((void *)ptr, (void *)mem, PERM_EX);
/* this should fail */
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
if (mfspr(SRR0) != (long) ptr ||
@@ -589,7 +589,7 @@ int mmu_test_17(void)
unmap((void *)ptr);
map((void *)ptr, (void *)mem, 0);
/* this should fail */
if (test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
if (!test_exec(2, ptr, MSR_SF | MSR_HV | MSR_IR | MSR_LE))
return 1;
/* SRR0 and SRR1 should be set correctly */
/* RC update fail bit should not be set */
@@ -608,12 +608,12 @@ int mmu_test_18(void)
/* create PTE */
map(ptr, mem, DFLT_PERM);
/* this should succeed and be a cache miss */
if (!test_dcbz(&ptr[129]))
if (test_dcbz(&ptr[129]))
return 1;
/* create a second PTE */
map(ptr2, mem, DFLT_PERM);
/* this should succeed and be a cache hit */
if (!test_dcbz(&ptr2[130]))
if (test_dcbz(&ptr2[130]))
return 2;
return 0;
}
@@ -627,7 +627,7 @@ int mmu_test_19(void)
/* create PTE with read but not write permission */
map(ptr, mem, REF | PERM_RD);
/* this should fail and create a TLB entry */
if (test_write(ptr, 0xdeadbeef0dd1))
if (!test_write(ptr, 0xdeadbeef0dd1))
return 1;
/* DAR and DSISR should be set correctly */
if (mfspr(DAR) != (long)ptr || mfspr(DSISR) != 0x0a000000)
@@ -635,11 +635,26 @@ int mmu_test_19(void)
/* Update the PTE to have write permission */
map(ptr, mem, REF | CHG | PERM_RD | PERM_WR);
/* this should succeed */
if (!test_write(ptr, 0xdeadbeef0dd1))
if (test_write(ptr, 0xdeadbeef0dd1))
return 3;
return 0;
}
int mmu_test_20(void)
{
unsigned long mem = 0x2000;
unsigned long ptr = 0x324000;
unsigned long ret;
/* create a PTE with execute permission */
map((void *)ptr, (void *)mem, PERM_EX | PERM_PRIV | REF);
ret = test_exec(0x124000, ptr + 0xfe8, MSR_SF | MSR_HV | MSR_IR | MSR_DR | MSR_LE);
/* Should see a 300 from the load, not a 400 from the page crossing */
if (ret != 0x300)
return ret + 1;
return 0;
}
int fail = 0;
void do_test(int num, int (*test)(void))
@@ -656,7 +671,10 @@ void do_test(int num, int (*test)(void))
} else {
fail = 1;
print_string("FAIL ");
putchar(ret + '0');
if (ret < 10)
putchar(ret + '0');
else
print_hex(ret);
if (num <= 10 || num == 19) {
print_string(" DAR=");
print_hex(mfspr(DAR));
@@ -696,6 +714,7 @@ int main(void)
do_test(17, mmu_test_17);
do_test(18, mmu_test_18);
do_test(19, mmu_test_19);
do_test(20, mmu_test_20);
return fail;
}

BIN
tests/test_mmu.bin
View File

Binary file not shown.

1
tests/test_mmu.console_out
View File

@@ -17,3 +17,4 @@ test 16:PASS
test 17:PASS
test 18:PASS
test 19:PASS
test 20:PASS