forked from Minki/linux
6f26353ca2
While most users of the hcall tracepoints will only want the opcode and return code, some will want all the arguments. To avoid the complexity of using varargs we pass a pointer to the register save area, which contains all the arguments. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
231 lines
4.7 KiB
ArmAsm
231 lines
4.7 KiB
ArmAsm
/*
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* This file contains the generic code to perform a call to the
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* pSeries LPAR hypervisor.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/hvcall.h>
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#define STK_PARM(i) (48 + ((i)-3)*8)
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#ifdef CONFIG_TRACEPOINTS
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.section ".toc","aw"
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.globl hcall_tracepoint_refcount
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hcall_tracepoint_refcount:
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.llong 0
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.section ".text"
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/*
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* precall must preserve all registers. use unused STK_PARM()
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* areas to save snapshots and opcode. We branch around this
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* in early init (eg when populating the MMU hashtable) by using an
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* unconditional cpu feature.
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*/
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#define HCALL_INST_PRECALL(FIRST_REG) \
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BEGIN_FTR_SECTION; \
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b 1f; \
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END_FTR_SECTION(0, 1); \
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ld r12,hcall_tracepoint_refcount@toc(r2); \
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cmpdi r12,0; \
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beq+ 1f; \
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mflr r0; \
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std r3,STK_PARM(r3)(r1); \
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std r4,STK_PARM(r4)(r1); \
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std r5,STK_PARM(r5)(r1); \
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std r6,STK_PARM(r6)(r1); \
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std r7,STK_PARM(r7)(r1); \
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std r8,STK_PARM(r8)(r1); \
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std r9,STK_PARM(r9)(r1); \
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std r10,STK_PARM(r10)(r1); \
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std r0,16(r1); \
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addi r4,r1,STK_PARM(FIRST_REG); \
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stdu r1,-STACK_FRAME_OVERHEAD(r1); \
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bl .__trace_hcall_entry; \
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addi r1,r1,STACK_FRAME_OVERHEAD; \
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ld r0,16(r1); \
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ld r3,STK_PARM(r3)(r1); \
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ld r4,STK_PARM(r4)(r1); \
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ld r5,STK_PARM(r5)(r1); \
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ld r6,STK_PARM(r6)(r1); \
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ld r7,STK_PARM(r7)(r1); \
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ld r8,STK_PARM(r8)(r1); \
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ld r9,STK_PARM(r9)(r1); \
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ld r10,STK_PARM(r10)(r1); \
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mtlr r0; \
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1:
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/*
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* postcall is performed immediately before function return which
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* allows liberal use of volatile registers. We branch around this
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* in early init (eg when populating the MMU hashtable) by using an
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* unconditional cpu feature.
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*/
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#define __HCALL_INST_POSTCALL \
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BEGIN_FTR_SECTION; \
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b 1f; \
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END_FTR_SECTION(0, 1); \
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ld r12,hcall_tracepoint_refcount@toc(r2); \
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cmpdi r12,0; \
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beq+ 1f; \
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mflr r0; \
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ld r6,STK_PARM(r3)(r1); \
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std r3,STK_PARM(r3)(r1); \
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mr r4,r3; \
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mr r3,r6; \
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std r0,16(r1); \
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stdu r1,-STACK_FRAME_OVERHEAD(r1); \
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bl .__trace_hcall_exit; \
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addi r1,r1,STACK_FRAME_OVERHEAD; \
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ld r0,16(r1); \
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ld r3,STK_PARM(r3)(r1); \
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mtlr r0; \
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1:
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#define HCALL_INST_POSTCALL_NORETS \
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li r5,0; \
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__HCALL_INST_POSTCALL
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#define HCALL_INST_POSTCALL(BUFREG) \
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mr r5,BUFREG; \
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__HCALL_INST_POSTCALL
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#else
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#define HCALL_INST_PRECALL(FIRST_ARG)
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#define HCALL_INST_POSTCALL_NORETS
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#define HCALL_INST_POSTCALL(BUFREG)
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#endif
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.text
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_GLOBAL(plpar_hcall_norets)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL(r4)
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HVSC /* invoke the hypervisor */
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HCALL_INST_POSTCALL_NORETS
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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_GLOBAL(plpar_hcall)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL(r5)
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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HVSC /* invoke the hypervisor */
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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HCALL_INST_POSTCALL(r12)
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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/*
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* plpar_hcall_raw can be called in real mode. kexec/kdump need some
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* hypervisor calls to be executed in real mode. So plpar_hcall_raw
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* does not access the per cpu hypervisor call statistics variables,
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* since these variables may not be present in the RMO region.
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*/
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_GLOBAL(plpar_hcall_raw)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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HVSC /* invoke the hypervisor */
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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_GLOBAL(plpar_hcall9)
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HMT_MEDIUM
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mfcr r0
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stw r0,8(r1)
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HCALL_INST_PRECALL(r5)
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std r4,STK_PARM(r4)(r1) /* Save ret buffer */
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mr r4,r5
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mr r5,r6
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mr r6,r7
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mr r7,r8
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mr r8,r9
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mr r9,r10
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ld r10,STK_PARM(r11)(r1) /* put arg7 in R10 */
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ld r11,STK_PARM(r12)(r1) /* put arg8 in R11 */
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ld r12,STK_PARM(r13)(r1) /* put arg9 in R12 */
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HVSC /* invoke the hypervisor */
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mr r0,r12
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ld r12,STK_PARM(r4)(r1)
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std r4, 0(r12)
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std r5, 8(r12)
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std r6, 16(r12)
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std r7, 24(r12)
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std r8, 32(r12)
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std r9, 40(r12)
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std r10,48(r12)
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std r11,56(r12)
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std r0, 64(r12)
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HCALL_INST_POSTCALL(r12)
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lwz r0,8(r1)
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mtcrf 0xff,r0
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blr /* return r3 = status */
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