ARCv2: entry: save Accumulator register pair (r58:59) if present

Accumulator is present in configs with FPU and/or DSP MPY (mpy > 6)

Instead of doing this in pt_regs (and thus every kernel entry/exit),
this could have been done in context switch (and for user task only) as
currently kernel doesn't clobber these registers for its own accord.
However we will soon start using 64-bit multiply instructions for kernel
which can clobber these. Also gcc folks also plan to start using these
as GPRs, hence better to always save/restore them

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

4 files changed, 43 insertions, 9 deletions

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index c9f30f4763abc..5d7fb3e7cb971 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -406,6 +406,14 @@ config ARC_HAS_DIV_REM
 	bool "Insn: div, divu, rem, remu"
 	default y
 
+config ARC_HAS_ACCL_REGS
+	bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6)"
+	default n
+	help
+	  Depending on the configuration, CPU can contain accumulator reg-pair
+	  (also referred to as r58:r59). These can also be used by gcc as GPR so
+	  kernel needs to save/restore per process
+
 endif	# ISA_ARCV2
 
 endmenu   # "ARC CPU Configuration"
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index aee1a77934cf6..ac85380d14a4b 100644
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -16,6 +16,11 @@
 	;
 	; Now manually save: r12, sp, fp, gp, r25
 
+#ifdef CONFIG_ARC_HAS_ACCL_REGS
+	PUSH	r59
+	PUSH	r58
+#endif
+
 	PUSH	r30
 	PUSH	r12
 
@@ -75,6 +80,11 @@
 	POP	r12
 	POP	r30
 
+#ifdef CONFIG_ARC_HAS_ACCL_REGS
+	POP	r58
+	POP	r59
+#endif
+
 .endm
 
 /*------------------------------------------------------------------------*/
diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 47111d565a959..5297faa8a3780 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -86,6 +86,10 @@ struct pt_regs {
 
 	unsigned long r12, r30;
 
+#ifdef CONFIG_ARC_HAS_ACCL_REGS
+	unsigned long r58, r59;	/* ACCL/ACCH used by FPU / DSP MPY */
+#endif
+
 	/*------- Below list auto saved by h/w -----------*/
 	unsigned long r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11;
 
diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index fa62404ba58f7..fc8211f338ad3 100644
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -319,7 +319,8 @@ static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 static void arc_chk_core_config(void)
 {
 	struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
-	int fpu_enabled;
+	int saved = 0, present = 0;
+	char *opt_nm = NULL;;
 
 	if (!cpu->extn.timer0)
 		panic("Timer0 is not present!\n");
@@ -346,17 +347,28 @@ static void arc_chk_core_config(void)
 
 	/*
 	 * FP hardware/software config sanity
-	 * -If hardware contains DPFP, kernel needs to save/restore FPU state
+	 * -If hardware present, kernel needs to save/restore FPU state
 	 * -If not, it will crash trying to save/restore the non-existant regs
-	 *
-	 * (only DPDP checked since SP has no arch visible regs)
 	 */
-	fpu_enabled = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 
-	if (cpu->extn.fpu_dp && !fpu_enabled)
-		pr_warn("CONFIG_ARC_FPU_SAVE_RESTORE needed for working apps\n");
-	else if (!cpu->extn.fpu_dp && fpu_enabled)
-		panic("FPU non-existent, disable CONFIG_ARC_FPU_SAVE_RESTORE\n");
+	if (is_isa_arcompact()) {
+		opt_nm = "CONFIG_ARC_FPU_SAVE_RESTORE";
+		saved = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
+
+		/* only DPDP checked since SP has no arch visible regs */
+		present = cpu->extn.fpu_dp;
+	} else {
+		opt_nm = "CONFIG_ARC_HAS_ACCL_REGS";
+		saved = IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS);
+
+		/* Accumulator Low:High pair (r58:59) present if DSP MPY or FPU */
+		present = cpu->extn_mpy.dsp | cpu->extn.fpu_sp | cpu->extn.fpu_dp;
+	}
+
+	if (present && !saved)
+		pr_warn("Enable %s for working apps\n", opt_nm);
+	else if (!present && saved)
+		panic("Disable %s, hardware NOT present\n", opt_nm);
 }
 
 /*