linux-kernel - [PATCH 2/5] MIPS: genex: Fix except_vec

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Message-Id: <20231023191400.170052-3-jiaxun.yang@flygoat.com>
Date:   Mon, 23 Oct 2023 20:13:57 +0100
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        gregory.clement@...tlin.com, vladimir.kondratiev@...el.com,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 2/5] MIPS: genex: Fix except_vec_vi for kernel in XKPHYS

Use {highest, higher, hi, lo} immediate loading sequence
to load 64 bit jump address for handler when kernel is
loaded to XKPHYS.

Co-developed-by: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@...el.com>
Co-developed-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/kernel/genex.S | 19 +++++++++++++++----
 arch/mips/kernel/traps.c | 34 ++++++++++++++++++++++++----------
 2 files changed, 39 insertions(+), 14 deletions(-)

diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index b6de8e88c1bd..fd765ad9ecac 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -272,11 +272,22 @@ NESTED(except_vec_vi, 0, sp)
 	.set	push
 	.set	noreorder
 	PTR_LA	v1, except_vec_vi_handler
-FEXPORT(except_vec_vi_lui)
-	lui	v0, 0		/* Patched */
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+FEXPORT(except_vec_vi_hi)
+	lui	v0, 0			/* Patched */
+#else
+FEXPORT(except_vec_vi_highest)
+	lui	v0, 0			/* Patched */
+FEXPORT(except_vec_vi_higher)
+	daddiu	v0, 0			/* Patched */
+	dsll	v0, 16
+FEXPORT(except_vec_vi_hi)
+	daddiu	v0, 0			/* Patched */
+	dsll	v0, 16
+#endif
 	jr	v1
-FEXPORT(except_vec_vi_ori)
-	 ori	v0, 0		/* Patched */
+FEXPORT(except_vec_vi_lo)
+	PTR_ADDIU	v0, 0		/* Patched */
 	.set	pop
 	END(except_vec_vi)
 EXPORT(except_vec_vi_end)
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 246c6a6b0261..60c513c51684 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2091,18 +2091,26 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
 		 * If no shadow set is selected then use the default handler
 		 * that does normal register saving and standard interrupt exit
 		 */
-		extern const u8 except_vec_vi[], except_vec_vi_lui[];
-		extern const u8 except_vec_vi_ori[], except_vec_vi_end[];
+		extern const u8 except_vec_vi[], except_vec_vi_hi[];
+		extern const u8 except_vec_vi_lo[], except_vec_vi_end[];
+#if defined(CONFIG_64BIT) && !defined(KBUILD_64BIT_SYM32)
+		extern const u8 except_vec_vi_highest[], except_vec_vi_higher[];
+#endif
 		extern const u8 rollback_except_vec_vi[];
 		const u8 *vec_start = using_rollback_handler() ?
 				      rollback_except_vec_vi : except_vec_vi;
 #if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_BIG_ENDIAN)
-		const int lui_offset = except_vec_vi_lui - vec_start + 2;
-		const int ori_offset = except_vec_vi_ori - vec_start + 2;
+		const int imm_offset = 2;
 #else
-		const int lui_offset = except_vec_vi_lui - vec_start;
-		const int ori_offset = except_vec_vi_ori - vec_start;
+		const int imm_offset = 0;
+#endif
+#if defined(CONFIG_64BIT) && !defined(KBUILD_64BIT_SYM32)
+		const int highest_offset = except_vec_vi_highest - vec_start + imm_offset;
+		const int higher_offset = except_vec_vi_higher - vec_start + imm_offset;
 #endif
+		const int hi_offset = except_vec_vi_hi - vec_start + imm_offset;
+		const int lo_offset = except_vec_vi_lo - vec_start + imm_offset;
+
 		const int handler_len = except_vec_vi_end - vec_start;
 
 		if (handler_len > VECTORSPACING) {
@@ -2119,10 +2127,16 @@ static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs)
 #else
 				handler_len);
 #endif
-		h = (u16 *)(b + lui_offset);
-		*h = (handler >> 16) & 0xffff;
-		h = (u16 *)(b + ori_offset);
-		*h = (handler & 0xffff);
+#if defined(CONFIG_64BIT) && !defined(KBUILD_64BIT_SYM32)
+		h = (u16 *)(b + highest_offset);
+		*h = uasm_rel_highest(handler);
+		h = (u16 *)(b + higher_offset);
+		*h = uasm_rel_higher(handler);
+#endif
+		h = (u16 *)(b + hi_offset);
+		*h = uasm_rel_hi(handler);
+		h = (u16 *)(b + lo_offset);
+		*h = uasm_rel_lo(handler);
 		local_flush_icache_range((unsigned long)b,
 					 (unsigned long)(b+handler_len));
 	}
-- 
2.34.1