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-rw-r--r--arch/powerpc/platforms/pseries/hvCall.S226
1 files changed, 164 insertions, 62 deletions
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
index 444fe7759e55..2b0cac6fb61f 100644
--- a/arch/powerpc/platforms/pseries/hvCall.S
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -1,42 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains the generic code to perform a call to the
* pSeries LPAR hypervisor.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
+#include <linux/jump_label.h>
#include <asm/hvcall.h>
#include <asm/processor.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>
+#include <asm/feature-fixups.h>
+
+ .section ".text"
#ifdef CONFIG_TRACEPOINTS
- .section ".toc","aw"
+#ifndef CONFIG_JUMP_LABEL
+ .data
.globl hcall_tracepoint_refcount
hcall_tracepoint_refcount:
- .llong 0
+ .8byte 0
.section ".text"
+#endif
/*
* precall must preserve all registers. use unused STK_PARAM()
- * areas to save snapshots and opcode. We branch around this
- * in early init (eg when populating the MMU hashtable) by using an
- * unconditional cpu feature.
+ * areas to save snapshots and opcode. STK_PARAM() in the caller's
+ * frame will be available even on ELFv2 because these are all
+ * variadic functions.
*/
#define HCALL_INST_PRECALL(FIRST_REG) \
-BEGIN_FTR_SECTION; \
- b 1f; \
-END_FTR_SECTION(0, 1); \
- ld r12,hcall_tracepoint_refcount@toc(r2); \
- std r12,32(r1); \
- cmpdi r12,0; \
- beq+ 1f; \
mflr r0; \
std r3,STK_PARAM(R3)(r1); \
std r4,STK_PARAM(R4)(r1); \
@@ -48,47 +43,31 @@ END_FTR_SECTION(0, 1); \
std r10,STK_PARAM(R10)(r1); \
std r0,16(r1); \
addi r4,r1,STK_PARAM(FIRST_REG); \
- stdu r1,-STACK_FRAME_OVERHEAD(r1); \
- bl .__trace_hcall_entry; \
- addi r1,r1,STACK_FRAME_OVERHEAD; \
- ld r0,16(r1); \
- ld r3,STK_PARAM(R3)(r1); \
- ld r4,STK_PARAM(R4)(r1); \
- ld r5,STK_PARAM(R5)(r1); \
- ld r6,STK_PARAM(R6)(r1); \
- ld r7,STK_PARAM(R7)(r1); \
- ld r8,STK_PARAM(R8)(r1); \
- ld r9,STK_PARAM(R9)(r1); \
- ld r10,STK_PARAM(R10)(r1); \
- mtlr r0; \
-1:
+ stdu r1,-STACK_FRAME_MIN_SIZE(r1); \
+ bl CFUNC(__trace_hcall_entry); \
+ ld r3,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
+ ld r4,STACK_FRAME_MIN_SIZE+STK_PARAM(R4)(r1); \
+ ld r5,STACK_FRAME_MIN_SIZE+STK_PARAM(R5)(r1); \
+ ld r6,STACK_FRAME_MIN_SIZE+STK_PARAM(R6)(r1); \
+ ld r7,STACK_FRAME_MIN_SIZE+STK_PARAM(R7)(r1); \
+ ld r8,STACK_FRAME_MIN_SIZE+STK_PARAM(R8)(r1); \
+ ld r9,STACK_FRAME_MIN_SIZE+STK_PARAM(R9)(r1); \
+ ld r10,STACK_FRAME_MIN_SIZE+STK_PARAM(R10)(r1)
/*
* postcall is performed immediately before function return which
- * allows liberal use of volatile registers. We branch around this
- * in early init (eg when populating the MMU hashtable) by using an
- * unconditional cpu feature.
+ * allows liberal use of volatile registers.
*/
#define __HCALL_INST_POSTCALL \
-BEGIN_FTR_SECTION; \
- b 1f; \
-END_FTR_SECTION(0, 1); \
- ld r12,32(r1); \
- cmpdi r12,0; \
- beq+ 1f; \
- mflr r0; \
- ld r6,STK_PARAM(R3)(r1); \
- std r3,STK_PARAM(R3)(r1); \
+ ld r0,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
+ std r3,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
mr r4,r3; \
- mr r3,r6; \
- std r0,16(r1); \
- stdu r1,-STACK_FRAME_OVERHEAD(r1); \
- bl .__trace_hcall_exit; \
- addi r1,r1,STACK_FRAME_OVERHEAD; \
- ld r0,16(r1); \
+ mr r3,r0; \
+ bl CFUNC(__trace_hcall_exit); \
+ ld r0,STACK_FRAME_MIN_SIZE+16(r1); \
+ addi r1,r1,STACK_FRAME_MIN_SIZE; \
ld r3,STK_PARAM(R3)(r1); \
- mtlr r0; \
-1:
+ mtlr r0
#define HCALL_INST_POSTCALL_NORETS \
li r5,0; \
@@ -98,37 +77,83 @@ END_FTR_SECTION(0, 1); \
mr r5,BUFREG; \
__HCALL_INST_POSTCALL
+#ifdef CONFIG_JUMP_LABEL
+#define HCALL_BRANCH(LABEL) \
+ ARCH_STATIC_BRANCH(LABEL, hcall_tracepoint_key)
+#else
+
+/*
+ * We branch around this in early init (eg when populating the MMU
+ * hashtable) by using an unconditional cpu feature.
+ */
+#define HCALL_BRANCH(LABEL) \
+BEGIN_FTR_SECTION; \
+ b 1f; \
+END_FTR_SECTION(0, 1); \
+ LOAD_REG_ADDR(r12, hcall_tracepoint_refcount) ; \
+ ld r12,0(r12); \
+ cmpdi r12,0; \
+ bne- LABEL; \
+1:
+#endif
+
#else
#define HCALL_INST_PRECALL(FIRST_ARG)
#define HCALL_INST_POSTCALL_NORETS
#define HCALL_INST_POSTCALL(BUFREG)
+#define HCALL_BRANCH(LABEL)
#endif
- .text
-
-_GLOBAL(plpar_hcall_norets)
+_GLOBAL_TOC(plpar_hcall_norets_notrace)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
+ HVSC /* invoke the hypervisor */
- HCALL_INST_PRECALL(R4)
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+ blr /* return r3 = status */
+
+_GLOBAL_TOC(plpar_hcall_norets)
+ HMT_MEDIUM
+ mfcr r0
+ stw r0,8(r1)
+ HCALL_BRANCH(plpar_hcall_norets_trace)
HVSC /* invoke the hypervisor */
- HCALL_INST_POSTCALL_NORETS
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
-_GLOBAL(plpar_hcall)
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall_norets_trace:
+ HCALL_INST_PRECALL(R4)
+ HVSC
+ HCALL_INST_POSTCALL_NORETS
+
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+ blr
+#endif
+
+_GLOBAL_TOC(plpar_hcall)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
- HCALL_INST_PRECALL(R5)
+ HCALL_BRANCH(plpar_hcall_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
@@ -147,13 +172,44 @@ _GLOBAL(plpar_hcall)
std r6, 16(r12)
std r7, 24(r12)
- HCALL_INST_POSTCALL(r12)
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall_trace:
+ HCALL_INST_PRECALL(R5)
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+
+ HVSC
+
+ ld r12,STACK_FRAME_MIN_SIZE+STK_PARAM(R4)(r1)
+ std r4,0(r12)
+ std r5,8(r12)
+ std r6,16(r12)
+ std r7,24(r12)
+
+ HCALL_INST_POSTCALL(r12)
+
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr
+#endif
+
/*
* plpar_hcall_raw can be called in real mode. kexec/kdump need some
* hypervisor calls to be executed in real mode. So plpar_hcall_raw
@@ -183,18 +239,21 @@ _GLOBAL(plpar_hcall_raw)
std r6, 16(r12)
std r7, 24(r12)
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
-_GLOBAL(plpar_hcall9)
+_GLOBAL_TOC(plpar_hcall9)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
- HCALL_INST_PRECALL(R5)
+ HCALL_BRANCH(plpar_hcall9_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
@@ -222,13 +281,53 @@ _GLOBAL(plpar_hcall9)
std r11,56(r12)
std r0, 64(r12)
- HCALL_INST_POSTCALL(r12)
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
+#ifdef CONFIG_TRACEPOINTS
+plpar_hcall9_trace:
+ HCALL_INST_PRECALL(R5)
+
+ mr r4,r5
+ mr r5,r6
+ mr r6,r7
+ mr r7,r8
+ mr r8,r9
+ mr r9,r10
+ ld r10,STACK_FRAME_MIN_SIZE+STK_PARAM(R11)(r1)
+ ld r11,STACK_FRAME_MIN_SIZE+STK_PARAM(R12)(r1)
+ ld r12,STACK_FRAME_MIN_SIZE+STK_PARAM(R13)(r1)
+
+ HVSC
+
+ mr r0,r12
+ ld r12,STACK_FRAME_MIN_SIZE+STK_PARAM(R4)(r1)
+ std r4,0(r12)
+ std r5,8(r12)
+ std r6,16(r12)
+ std r7,24(r12)
+ std r8,32(r12)
+ std r9,40(r12)
+ std r10,48(r12)
+ std r11,56(r12)
+ std r0,64(r12)
+
+ HCALL_INST_POSTCALL(r12)
+
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
+ lwz r0,8(r1)
+ mtcrf 0xff,r0
+
+ blr
+#endif
+
/* See plpar_hcall_raw to see why this is needed */
_GLOBAL(plpar_hcall9_raw)
HMT_MEDIUM
@@ -262,6 +361,9 @@ _GLOBAL(plpar_hcall9_raw)
std r11,56(r12)
std r0, 64(r12)
+ li r4,0
+ stb r4,PACASRR_VALID(r13)
+
lwz r0,8(r1)
mtcrf 0xff,r0
generated by cgit (git 2.34.1) at 2025-12-26 15:04:09 +0000