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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: csgroup.eu X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: 4ce2e6da-f140-4009-ddfd-08d9c3d7232b X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Dec 2021 16:38:22.4473 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9914def7-b676-4fda-8815-5d49fb3b45c8 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 6q2zSNDDxPc47jDhItVLh3pnUrzuZbZFgB9d8iVzyaygQRzZ5ssAvVKGZjg2U/xA8bvm/n575DaqmykmjmwP/YEJF5y6r679RIlJmTRRlkw= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MR1P264MB2161 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "live-patching@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" In order to implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS, change ftrace_caller() stack layout to match struct pt_regs. Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/ftrace.h | 39 +-------------------------- arch/powerpc/kernel/trace/ftrace_32.S | 29 +++++++++++++++++--- 2 files changed, 26 insertions(+), 42 deletions(-) diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/f= trace.h index debe8c4f7062..b3f6184f77ea 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -10,44 +10,7 @@ =20 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR =20 -#ifdef __ASSEMBLY__ - -/* Based off of objdump output from glibc */ - -#define MCOUNT_SAVE_FRAME \ - stwu r1,-48(r1); \ - stw r3, 12(r1); \ - stw r4, 16(r1); \ - stw r5, 20(r1); \ - stw r6, 24(r1); \ - mflr r3; \ - lwz r4, 52(r1); \ - mfcr r5; \ - stw r7, 28(r1); \ - stw r8, 32(r1); \ - stw r9, 36(r1); \ - stw r10,40(r1); \ - stw r3, 44(r1); \ - stw r5, 8(r1) - -#define MCOUNT_RESTORE_FRAME \ - lwz r6, 8(r1); \ - lwz r0, 44(r1); \ - lwz r3, 12(r1); \ - mtctr r0; \ - lwz r4, 16(r1); \ - mtcr r6; \ - lwz r5, 20(r1); \ - lwz r6, 24(r1); \ - lwz r0, 52(r1); \ - lwz r7, 28(r1); \ - lwz r8, 32(r1); \ - mtlr r0; \ - lwz r9, 36(r1); \ - lwz r10,40(r1); \ - addi r1, r1, 48 - -#else /* !__ASSEMBLY__ */ +#ifndef __ASSEMBLY__ extern void _mcount(void); =20 static inline unsigned long ftrace_call_adjust(unsigned long addr) diff --git a/arch/powerpc/kernel/trace/ftrace_32.S b/arch/powerpc/kernel/tr= ace/ftrace_32.S index 95ffea2bdc29..c4055b41af5f 100644 --- a/arch/powerpc/kernel/trace/ftrace_32.S +++ b/arch/powerpc/kernel/trace/ftrace_32.S @@ -27,17 +27,38 @@ _GLOBAL(_mcount) EXPORT_SYMBOL(_mcount) =20 _GLOBAL(ftrace_caller) - MCOUNT_SAVE_FRAME - /* r3 ends up with link register */ + stwu r1, -INT_FRAME_SIZE(r1) + + SAVE_GPRS(3, 10, r1) + + addi r8, r1, INT_FRAME_SIZE + stw r8, GPR1(r1) + + mflr r3 + stw r3, _NIP(r1) subi r3, r3, MCOUNT_INSN_SIZE + + stw r0, _LINK(r1) + mr r4, r0 + lis r5,function_trace_op@ha lwz r5,function_trace_op@l(r5) - li r6, 0 + + addi r6, r1, STACK_FRAME_OVERHEAD .globl ftrace_call ftrace_call: bl ftrace_stub nop - MCOUNT_RESTORE_FRAME + + lwz r3, _NIP(r1) + mtctr r3 + + REST_GPRS(3, 10, r1) + + lwz r0, _LINK(r1) + mtlr r0 + + addi r1, r1, INT_FRAME_SIZE ftrace_caller_common: #ifdef CONFIG_FUNCTION_GRAPH_TRACER .globl ftrace_graph_call --=20 2.33.1