MIPS: Fix ISA I/II FP signal context offsets

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@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14476/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 83 insertions, 76 deletions

diff --git a/arch/mips/kernel/r2300_fpu.S b/arch/mips/kernel/r2300_fpu.S
index ce249eae91ce..70ca63752cfa 100644
--- a/arch/mips/kernel/r2300_fpu.S
+++ b/arch/mips/kernel/r2300_fpu.S
@@ -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