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| author |   Cyril Bur <cyrilbur@gmail.com> | 2016-02-29 17:53:44 +1100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2016-03-02 23:34:47 +1100 |
| commit | e5ab8be68e4421d7f8d4e69e2a8ddb3d69508d2a (patch) | |
| tree | 5a938174a6c5062aded2cb0015563b63f9c2f532 /tools/testing/selftests/powerpc/math/vmx_asm.S | |
| parent | selftests/powerpc: Test the preservation of FPU and VMX regs across syscall (diff) | |
| download | linux-dev-e5ab8be68e4421d7f8d4e69e2a8ddb3d69508d2a.tar.xz linux-dev-e5ab8be68e4421d7f8d4e69e2a8ddb3d69508d2a.zip | |
selftests/powerpc: Test preservation of FPU and VMX regs across preemption
Loop in assembly checking the registers with many threads.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc/math/vmx_asm.S')
| -rw-r--r-- | tools/testing/selftests/powerpc/math/vmx_asm.S | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/tools/testing/selftests/powerpc/math/vmx_asm.S b/tools/testing/selftests/powerpc/math/vmx_asm.S index 4ce64212d5e0..1b8c248b3ac1 100644 --- a/tools/testing/selftests/powerpc/math/vmx_asm.S +++ b/tools/testing/selftests/powerpc/math/vmx_asm.S @@ -9,6 +9,7 @@ #include "../basic_asm.h" +# POS MUST BE 16 ALIGNED! #define PUSH_VMX(pos,reg) \ li reg,pos; \ stvx v20,reg,sp; \ @@ -35,6 +36,7 @@ addi reg,reg,16; \ stvx v31,reg,sp; +# POS MUST BE 16 ALIGNED! #define POP_VMX(pos,reg) \ li reg,pos; \ lvx v20,reg,sp; \ @@ -93,7 +95,7 @@ FUNC_END(load_vmx) # Should be safe from C, only touches r4, r5 and v0,v1,v2 FUNC_START(check_vmx) - PUSH_BASIC_STACK(16) + PUSH_BASIC_STACK(32) mr r4,r3 li r3,1 # assume a bad result li r5,0 @@ -162,7 +164,7 @@ FUNC_START(check_vmx) cmpdi r0,0xffffffffffffffff bne 1f li r3,0 -1: POP_BASIC_STACK(16) +1: POP_BASIC_STACK(32) blr FUNC_END(check_vmx) @@ -193,3 +195,41 @@ FUNC_START(test_vmx) POP_BASIC_STACK(512) blr FUNC_END(test_vmx) + +# int preempt_vmx(vector int *varray, int *threads_starting, int *running) +# On starting will (atomically) decrement threads_starting as a signal that +# the VMX have been loaded with varray. Will proceed to check the validity of +# the VMX registers while running is not zero. +FUNC_START(preempt_vmx) + PUSH_BASIC_STACK(512) + std r3,STACK_FRAME_PARAM(0)(sp) # vector int *varray + std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting + std r5,STACK_FRAME_PARAM(2)(sp) # int *running + # VMX need to write to 16 byte aligned addresses, skip STACK_FRAME_LOCAL(3,0) + PUSH_VMX(STACK_FRAME_LOCAL(4,0),r4) + + bl load_vmx + nop + + sync + # Atomic DEC + ld r3,STACK_FRAME_PARAM(1)(sp) +1: lwarx r4,0,r3 + addi r4,r4,-1 + stwcx. r4,0,r3 + bne- 1b + +2: ld r3,STACK_FRAME_PARAM(0)(sp) + bl check_vmx + nop + cmpdi r3,0 + bne 3f + ld r4,STACK_FRAME_PARAM(2)(sp) + ld r5,0(r4) + cmpwi r5,0 + bne 2b + +3: POP_VMX(STACK_FRAME_LOCAL(4,0),r4) + POP_BASIC_STACK(512) + blr +FUNC_END(preempt_vmx) |