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hvCall.S
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains the generic code to perform a call to the
* pSeries LPAR hypervisor.
*/
#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
#ifndef CONFIG_JUMP_LABEL
.section ".toc","aw"
.globl hcall_tracepoint_refcount
hcall_tracepoint_refcount:
.8byte 0
.section ".text"
#endif
/*
* precall must preserve all registers. use unused STK_PARAM()
* areas to save snapshots and opcode.
*/
#define HCALL_INST_PRECALL(FIRST_REG) \
mflr r0; \
std r3,STK_PARAM(R3)(r1); \
std r4,STK_PARAM(R4)(r1); \
std r5,STK_PARAM(R5)(r1); \
std r6,STK_PARAM(R6)(r1); \
std r7,STK_PARAM(R7)(r1); \
std r8,STK_PARAM(R8)(r1); \
std r9,STK_PARAM(R9)(r1); \
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; \
ld r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
ld r4,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1); \
ld r5,STACK_FRAME_OVERHEAD+STK_PARAM(R5)(r1); \
ld r6,STACK_FRAME_OVERHEAD+STK_PARAM(R6)(r1); \
ld r7,STACK_FRAME_OVERHEAD+STK_PARAM(R7)(r1); \
ld r8,STACK_FRAME_OVERHEAD+STK_PARAM(R8)(r1); \
ld r9,STACK_FRAME_OVERHEAD+STK_PARAM(R9)(r1); \
ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R10)(r1)
/*
* postcall is performed immediately before function return which
* allows liberal use of volatile registers.
*/
#define __HCALL_INST_POSTCALL \
ld r0,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
std r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
mr r4,r3; \
mr r3,r0; \
bl __trace_hcall_exit; \
ld r0,STACK_FRAME_OVERHEAD+16(r1); \
addi r1,r1,STACK_FRAME_OVERHEAD; \
ld r3,STK_PARAM(R3)(r1); \
mtlr r0
#define HCALL_INST_POSTCALL_NORETS \
li r5,0; \
__HCALL_INST_POSTCALL
#define HCALL_INST_POSTCALL(BUFREG) \
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); \
ld r12,hcall_tracepoint_refcount@toc(r2); \
std r12,32(r1); \
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
_GLOBAL_TOC(plpar_hcall_norets)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall_norets_trace)
HVSC /* invoke the hypervisor */
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall_norets_trace:
HCALL_INST_PRECALL(R4)
HVSC
HCALL_INST_POSTCALL_NORETS
lwz r0,8(r1)
mtcrf 0xff,r0
blr
#endif
_GLOBAL_TOC(plpar_hcall)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC /* invoke the hypervisor */
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall_trace:
HCALL_INST_PRECALL(R5)
std r4,STK_PARAM(R4)(r1)
mr r0,r4
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC
ld r12,STK_PARAM(R4)(r1)
std r4,0(r12)
std r5,8(r12)
std r6,16(r12)
std r7,24(r12)
HCALL_INST_POSTCALL(r12)
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
* does not access the per cpu hypervisor call statistics variables,
* since these variables may not be present in the RMO region.
*/
_GLOBAL(plpar_hcall_raw)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
HVSC /* invoke the hypervisor */
ld r12,STK_PARAM(R4)(r1)
std r4, 0(r12)
std r5, 8(r12)
std r6, 16(r12)
std r7, 24(r12)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
_GLOBAL_TOC(plpar_hcall9)
HMT_MEDIUM
mfcr r0
stw r0,8(r1)
HCALL_BRANCH(plpar_hcall9_trace)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
HVSC /* invoke the hypervisor */
mr r0,r12
ld r12,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)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */
#ifdef CONFIG_TRACEPOINTS
plpar_hcall9_trace:
HCALL_INST_PRECALL(R5)
std r4,STK_PARAM(R4)(r1)
mr r0,r4
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R11)(r1)
ld r11,STACK_FRAME_OVERHEAD+STK_PARAM(R12)(r1)
ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R13)(r1)
HVSC
mr r0,r12
ld r12,STACK_FRAME_OVERHEAD+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)
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
mfcr r0
stw r0,8(r1)
std r4,STK_PARAM(R4)(r1) /* Save ret buffer */
mr r4,r5
mr r5,r6
mr r6,r7
mr r7,r8
mr r8,r9
mr r9,r10
ld r10,STK_PARAM(R11)(r1) /* put arg7 in R10 */
ld r11,STK_PARAM(R12)(r1) /* put arg8 in R11 */
ld r12,STK_PARAM(R13)(r1) /* put arg9 in R12 */
HVSC /* invoke the hypervisor */
mr r0,r12
ld r12,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)
lwz r0,8(r1)
mtcrf 0xff,r0
blr /* return r3 = status */