[PATCH 3/4] MIPS: Fix ISA I/II FP signal context offsets

From: Maciej W. Rozycki
Date: Mon Oct 31 2016 - 12:27:18 EST

Next message: Maciej W. Rozycki: "[PATCH 4/4] MIPS: Correct MIPS I FP sigcontext layout"
Previous message: Jason Gunthorpe: "Re: [PATCH] [ARM] Fix stack alignment when processing backtraces"
In reply to: Maciej W. Rozycki: "[PATCH 2/4] MIPS: Remove FIR from ISA I FP signal context"
Next in thread: Maciej W. Rozycki: "[PATCH 4/4] MIPS: Correct MIPS I FP sigcontext layout"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Fix a regression introduced with commit 2db9ca0a3551 ("MIPS: Use struct
mips_abi offsets to save FP context") for MIPS I/I FP signal contexts,
by converting save/restore code to the updated internal API. Start FGR
offsets from 0 rather than SC_FPREGS from $a0 and use $a1 rather than
the offset of SC_FPC_CSR from $a0 for the Floating Point Control/Status
Register (FCSR).

Document the new internal API and adjust assembly code formatting for
consistency.

Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxx>
---
linux-mips-isa12-sig-fp-context-offsets.patch
Index: linux-sfr-test/arch/mips/kernel/r2300_fpu.S
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/r2300_fpu.S 2016-10-22 02:28:09.266462000 +0100
+++ linux-sfr-test/arch/mips/kernel/r2300_fpu.S 2016-10-22 02:29:01.523906000 +0100
@@ -26,97 +26,104 @@

.set noreorder
.set mips1
- /* Save floating point context */
+
+/**
+ * _save_fp_context() - save FP context from the FPU
+ * @a0 - pointer to fpregs field of sigcontext
+ * @a1 - pointer to fpc_csr field of sigcontext
+ *
+ * Save FP context, including the 32 FP data registers and the FP
+ * control & status register, from the FPU to signal context.
+ */
LEAF(_save_fp_context)
.set push
SET_HARDFLOAT
li v0, 0 # assume success
- cfc1 t1,fcr31
- EX(swc1 $f0,(SC_FPREGS+0)(a0))
- EX(swc1 $f1,(SC_FPREGS+8)(a0))
- EX(swc1 $f2,(SC_FPREGS+16)(a0))
- EX(swc1 $f3,(SC_FPREGS+24)(a0))
- EX(swc1 $f4,(SC_FPREGS+32)(a0))
- EX(swc1 $f5,(SC_FPREGS+40)(a0))
- EX(swc1 $f6,(SC_FPREGS+48)(a0))
- EX(swc1 $f7,(SC_FPREGS+56)(a0))
- EX(swc1 $f8,(SC_FPREGS+64)(a0))
- EX(swc1 $f9,(SC_FPREGS+72)(a0))
- EX(swc1 $f10,(SC_FPREGS+80)(a0))
- EX(swc1 $f11,(SC_FPREGS+88)(a0))
- EX(swc1 $f12,(SC_FPREGS+96)(a0))
- EX(swc1 $f13,(SC_FPREGS+104)(a0))
- EX(swc1 $f14,(SC_FPREGS+112)(a0))
- EX(swc1 $f15,(SC_FPREGS+120)(a0))
- EX(swc1 $f16,(SC_FPREGS+128)(a0))
- EX(swc1 $f17,(SC_FPREGS+136)(a0))
- EX(swc1 $f18,(SC_FPREGS+144)(a0))
- EX(swc1 $f19,(SC_FPREGS+152)(a0))
- EX(swc1 $f20,(SC_FPREGS+160)(a0))
- EX(swc1 $f21,(SC_FPREGS+168)(a0))
- EX(swc1 $f22,(SC_FPREGS+176)(a0))
- EX(swc1 $f23,(SC_FPREGS+184)(a0))
- EX(swc1 $f24,(SC_FPREGS+192)(a0))
- EX(swc1 $f25,(SC_FPREGS+200)(a0))
- EX(swc1 $f26,(SC_FPREGS+208)(a0))
- EX(swc1 $f27,(SC_FPREGS+216)(a0))
- EX(swc1 $f28,(SC_FPREGS+224)(a0))
- EX(swc1 $f29,(SC_FPREGS+232)(a0))
- EX(swc1 $f30,(SC_FPREGS+240)(a0))
- EX(swc1 $f31,(SC_FPREGS+248)(a0))
+ cfc1 t1, fcr31
+ EX(swc1 $f0, 0(a0))
+ EX(swc1 $f1, 8(a0))
+ EX(swc1 $f2, 16(a0))
+ EX(swc1 $f3, 24(a0))
+ EX(swc1 $f4, 32(a0))
+ EX(swc1 $f5, 40(a0))
+ EX(swc1 $f6, 48(a0))
+ EX(swc1 $f7, 56(a0))
+ EX(swc1 $f8, 64(a0))
+ EX(swc1 $f9, 72(a0))
+ EX(swc1 $f10, 80(a0))
+ EX(swc1 $f11, 88(a0))
+ EX(swc1 $f12, 96(a0))
+ EX(swc1 $f13, 104(a0))
+ EX(swc1 $f14, 112(a0))
+ EX(swc1 $f15, 120(a0))
+ EX(swc1 $f16, 128(a0))
+ EX(swc1 $f17, 136(a0))
+ EX(swc1 $f18, 144(a0))
+ EX(swc1 $f19, 152(a0))
+ EX(swc1 $f20, 160(a0))
+ EX(swc1 $f21, 168(a0))
+ EX(swc1 $f22, 176(a0))
+ EX(swc1 $f23, 184(a0))
+ EX(swc1 $f24, 192(a0))
+ EX(swc1 $f25, 200(a0))
+ EX(swc1 $f26, 208(a0))
+ EX(swc1 $f27, 216(a0))
+ EX(swc1 $f28, 224(a0))
+ EX(swc1 $f29, 232(a0))
+ EX(swc1 $f30, 240(a0))
+ EX(swc1 $f31, 248(a0))
jr ra
- EX(sw t1,(SC_FPC_CSR)(a0))
+ EX(sw t1, (a1))
.set pop
END(_save_fp_context)

-/*
- * Restore FPU state:
- * - fp gp registers
- * - cp1 status/control register
+/**
+ * _restore_fp_context() - restore FP context to the FPU
+ * @a0 - pointer to fpregs field of sigcontext
+ * @a1 - pointer to fpc_csr field of sigcontext
*
- * We base the decision which registers to restore from the signal stack
- * frame on the current content of c0_status, not on the content of the
- * stack frame which might have been changed by the user.
+ * Restore FP context, including the 32 FP data registers and the FP
+ * control & status register, from signal context to the FPU.
*/
LEAF(_restore_fp_context)
.set push
SET_HARDFLOAT
li v0, 0 # assume success
- EX(lw t0,(SC_FPC_CSR)(a0))
- EX(lwc1 $f0,(SC_FPREGS+0)(a0))
- EX(lwc1 $f1,(SC_FPREGS+8)(a0))
- EX(lwc1 $f2,(SC_FPREGS+16)(a0))
- EX(lwc1 $f3,(SC_FPREGS+24)(a0))
- EX(lwc1 $f4,(SC_FPREGS+32)(a0))
- EX(lwc1 $f5,(SC_FPREGS+40)(a0))
- EX(lwc1 $f6,(SC_FPREGS+48)(a0))
- EX(lwc1 $f7,(SC_FPREGS+56)(a0))
- EX(lwc1 $f8,(SC_FPREGS+64)(a0))
- EX(lwc1 $f9,(SC_FPREGS+72)(a0))
- EX(lwc1 $f10,(SC_FPREGS+80)(a0))
- EX(lwc1 $f11,(SC_FPREGS+88)(a0))
- EX(lwc1 $f12,(SC_FPREGS+96)(a0))
- EX(lwc1 $f13,(SC_FPREGS+104)(a0))
- EX(lwc1 $f14,(SC_FPREGS+112)(a0))
- EX(lwc1 $f15,(SC_FPREGS+120)(a0))
- EX(lwc1 $f16,(SC_FPREGS+128)(a0))
- EX(lwc1 $f17,(SC_FPREGS+136)(a0))
- EX(lwc1 $f18,(SC_FPREGS+144)(a0))
- EX(lwc1 $f19,(SC_FPREGS+152)(a0))
- EX(lwc1 $f20,(SC_FPREGS+160)(a0))
- EX(lwc1 $f21,(SC_FPREGS+168)(a0))
- EX(lwc1 $f22,(SC_FPREGS+176)(a0))
- EX(lwc1 $f23,(SC_FPREGS+184)(a0))
- EX(lwc1 $f24,(SC_FPREGS+192)(a0))
- EX(lwc1 $f25,(SC_FPREGS+200)(a0))
- EX(lwc1 $f26,(SC_FPREGS+208)(a0))
- EX(lwc1 $f27,(SC_FPREGS+216)(a0))
- EX(lwc1 $f28,(SC_FPREGS+224)(a0))
- EX(lwc1 $f29,(SC_FPREGS+232)(a0))
- EX(lwc1 $f30,(SC_FPREGS+240)(a0))
- EX(lwc1 $f31,(SC_FPREGS+248)(a0))
+ EX(lw t0, (a1))
+ EX(lwc1 $f0, 0(a0))
+ EX(lwc1 $f1, 8(a0))
+ EX(lwc1 $f2, 16(a0))
+ EX(lwc1 $f3, 24(a0))
+ EX(lwc1 $f4, 32(a0))
+ EX(lwc1 $f5, 40(a0))
+ EX(lwc1 $f6, 48(a0))
+ EX(lwc1 $f7, 56(a0))
+ EX(lwc1 $f8, 64(a0))
+ EX(lwc1 $f9, 72(a0))
+ EX(lwc1 $f10, 80(a0))
+ EX(lwc1 $f11, 88(a0))
+ EX(lwc1 $f12, 96(a0))
+ EX(lwc1 $f13, 104(a0))
+ EX(lwc1 $f14, 112(a0))
+ EX(lwc1 $f15, 120(a0))
+ EX(lwc1 $f16, 128(a0))
+ EX(lwc1 $f17, 136(a0))
+ EX(lwc1 $f18, 144(a0))
+ EX(lwc1 $f19, 152(a0))
+ EX(lwc1 $f20, 160(a0))
+ EX(lwc1 $f21, 168(a0))
+ EX(lwc1 $f22, 176(a0))
+ EX(lwc1 $f23, 184(a0))
+ EX(lwc1 $f24, 192(a0))
+ EX(lwc1 $f25, 200(a0))
+ EX(lwc1 $f26, 208(a0))
+ EX(lwc1 $f27, 216(a0))
+ EX(lwc1 $f28, 224(a0))
+ EX(lwc1 $f29, 232(a0))
+ EX(lwc1 $f30, 240(a0))
+ EX(lwc1 $f31, 248(a0))
jr ra
- ctc1 t0,fcr31
+ ctc1 t0, fcr31
.set pop
END(_restore_fp_context)
.set reorder
Index: linux-sfr-test/arch/mips/kernel/r6000_fpu.S
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/r6000_fpu.S 2016-10-22 02:28:57.927876000 +0100
+++ linux-sfr-test/arch/mips/kernel/r6000_fpu.S 2016-10-22 02:29:12.415002000 +0100
@@ -21,7 +21,14 @@
.set push
SET_HARDFLOAT

- /* Save floating point context */
+/**
+ * _save_fp_context() - save FP context from the FPU
+ * @a0 - pointer to fpregs field of sigcontext
+ * @a1 - pointer to fpc_csr field of sigcontext
+ *
+ * Save FP context, including the 32 FP data registers and the FP
+ * control & status register, from the FPU to signal context.
+ */
LEAF(_save_fp_context)
mfc0 t0,CP0_STATUS
sll t0,t0,2
@@ -30,59 +37,59 @@

cfc1 t1,fcr31
/* Store the 16 double precision registers */
- sdc1 $f0,(SC_FPREGS+0)(a0)
- sdc1 $f2,(SC_FPREGS+16)(a0)
- sdc1 $f4,(SC_FPREGS+32)(a0)
- sdc1 $f6,(SC_FPREGS+48)(a0)
- sdc1 $f8,(SC_FPREGS+64)(a0)
- sdc1 $f10,(SC_FPREGS+80)(a0)
- sdc1 $f12,(SC_FPREGS+96)(a0)
- sdc1 $f14,(SC_FPREGS+112)(a0)
- sdc1 $f16,(SC_FPREGS+128)(a0)
- sdc1 $f18,(SC_FPREGS+144)(a0)
- sdc1 $f20,(SC_FPREGS+160)(a0)
- sdc1 $f22,(SC_FPREGS+176)(a0)
- sdc1 $f24,(SC_FPREGS+192)(a0)
- sdc1 $f26,(SC_FPREGS+208)(a0)
- sdc1 $f28,(SC_FPREGS+224)(a0)
- sdc1 $f30,(SC_FPREGS+240)(a0)
+ sdc1 $f0,0(a0)
+ sdc1 $f2,16(a0)
+ sdc1 $f4,32(a0)
+ sdc1 $f6,48(a0)
+ sdc1 $f8,64(a0)
+ sdc1 $f10,80(a0)
+ sdc1 $f12,96(a0)
+ sdc1 $f14,112(a0)
+ sdc1 $f16,128(a0)
+ sdc1 $f18,144(a0)
+ sdc1 $f20,160(a0)
+ sdc1 $f22,176(a0)
+ sdc1 $f24,192(a0)
+ sdc1 $f26,208(a0)
+ sdc1 $f28,224(a0)
+ sdc1 $f30,240(a0)
jr ra
- sw t0,SC_FPC_CSR(a0)
+ sw t0,(a1)
1: jr ra
nop
END(_save_fp_context)

-/* Restore FPU state:
- * - fp gp registers
- * - cp1 status/control register
+/**
+ * _restore_fp_context() - restore FP context to the FPU
+ * @a0 - pointer to fpregs field of sigcontext
+ * @a1 - pointer to fpc_csr field of sigcontext
*
- * We base the decision which registers to restore from the signal stack
- * frame on the current content of c0_status, not on the content of the
- * stack frame which might have been changed by the user.
+ * Restore FP context, including the 32 FP data registers and the FP
+ * control & status register, from signal context to the FPU.
*/
LEAF(_restore_fp_context)
mfc0 t0,CP0_STATUS
sll t0,t0,2

bgez t0,1f
- lw t0,SC_FPC_CSR(a0)
+ lw t0,(a1)
/* Restore the 16 double precision registers */
- ldc1 $f0,(SC_FPREGS+0)(a0)
- ldc1 $f2,(SC_FPREGS+16)(a0)
- ldc1 $f4,(SC_FPREGS+32)(a0)
- ldc1 $f6,(SC_FPREGS+48)(a0)
- ldc1 $f8,(SC_FPREGS+64)(a0)
- ldc1 $f10,(SC_FPREGS+80)(a0)
- ldc1 $f12,(SC_FPREGS+96)(a0)
- ldc1 $f14,(SC_FPREGS+112)(a0)
- ldc1 $f16,(SC_FPREGS+128)(a0)
- ldc1 $f18,(SC_FPREGS+144)(a0)
- ldc1 $f20,(SC_FPREGS+160)(a0)
- ldc1 $f22,(SC_FPREGS+176)(a0)
- ldc1 $f24,(SC_FPREGS+192)(a0)
- ldc1 $f26,(SC_FPREGS+208)(a0)
- ldc1 $f28,(SC_FPREGS+224)(a0)
- ldc1 $f30,(SC_FPREGS+240)(a0)
+ ldc1 $f0,0(a0)
+ ldc1 $f2,16(a0)
+ ldc1 $f4,32(a0)
+ ldc1 $f6,48(a0)
+ ldc1 $f8,64(a0)
+ ldc1 $f10,80(a0)
+ ldc1 $f12,96(a0)
+ ldc1 $f14,112(a0)
+ ldc1 $f16,128(a0)
+ ldc1 $f18,144(a0)
+ ldc1 $f20,160(a0)
+ ldc1 $f22,176(a0)
+ ldc1 $f24,192(a0)
+ ldc1 $f26,208(a0)
+ ldc1 $f28,224(a0)
+ ldc1 $f30,240(a0)
jr ra
ctc1 t0,fcr31
1: jr ra

Next message: Maciej W. Rozycki: "[PATCH 4/4] MIPS: Correct MIPS I FP sigcontext layout"
Previous message: Jason Gunthorpe: "Re: [PATCH] [ARM] Fix stack alignment when processing backtraces"
In reply to: Maciej W. Rozycki: "[PATCH 2/4] MIPS: Remove FIR from ISA I FP signal context"
Next in thread: Maciej W. Rozycki: "[PATCH 4/4] MIPS: Correct MIPS I FP sigcontext layout"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]