diff options
Diffstat (limited to 'arch/powerpc/kernel/trace/ftrace_mprofile.S')
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace_mprofile.S | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace_mprofile.S b/arch/powerpc/kernel/trace/ftrace_mprofile.S deleted file mode 100644 index ffb1db386849..000000000000 --- a/arch/powerpc/kernel/trace/ftrace_mprofile.S +++ /dev/null @@ -1,251 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * Split from ftrace_64.S - */ - -#include <linux/magic.h> -#include <asm/ppc_asm.h> -#include <asm/asm-offsets.h> -#include <asm/ftrace.h> -#include <asm/ppc-opcode.h> -#include <asm/export.h> -#include <asm/thread_info.h> -#include <asm/bug.h> -#include <asm/ptrace.h> - -/* - * - * ftrace_caller()/ftrace_regs_caller() is the function that replaces _mcount() - * when ftrace is active. - * - * We arrive here after a function A calls function B, and we are the trace - * function for B. When we enter r1 points to A's stack frame, B has not yet - * had a chance to allocate one yet. - * - * Additionally r2 may point either to the TOC for A, or B, depending on - * whether B did a TOC setup sequence before calling us. - * - * On entry the LR points back to the _mcount() call site, and r0 holds the - * saved LR as it was on entry to B, ie. the original return address at the - * call site in A. - * - * Our job is to save the register state into a struct pt_regs (on the stack) - * and then arrange for the ftrace function to be called. - */ -.macro ftrace_regs_entry allregs - /* Create our stack frame + pt_regs */ - PPC_STLU r1,-SWITCH_FRAME_SIZE(r1) - - /* Save all gprs to pt_regs */ - SAVE_GPR(0, r1) - SAVE_GPRS(3, 10, r1) - -#ifdef CONFIG_PPC64 - /* Save the original return address in A's stack frame */ - std r0, LRSAVE+SWITCH_FRAME_SIZE(r1) - /* Ok to continue? */ - lbz r3, PACA_FTRACE_ENABLED(r13) - cmpdi r3, 0 - beq ftrace_no_trace -#endif - - .if \allregs == 1 - SAVE_GPR(2, r1) - SAVE_GPRS(11, 31, r1) - .else -#ifdef CONFIG_LIVEPATCH_64 - SAVE_GPR(14, r1) -#endif - .endif - - /* Save previous stack pointer (r1) */ - addi r8, r1, SWITCH_FRAME_SIZE - PPC_STL r8, GPR1(r1) - - .if \allregs == 1 - /* Load special regs for save below */ - mfmsr r8 - mfctr r9 - mfxer r10 - mfcr r11 - .else - /* Clear MSR to flag as ftrace_caller versus frace_regs_caller */ - li r8, 0 - .endif - - /* Get the _mcount() call site out of LR */ - mflr r7 - /* Save it as pt_regs->nip */ - PPC_STL r7, _NIP(r1) - /* Save the read LR in pt_regs->link */ - PPC_STL r0, _LINK(r1) - -#ifdef CONFIG_PPC64 - /* Save callee's TOC in the ABI compliant location */ - std r2, STK_GOT(r1) - LOAD_PACA_TOC() /* get kernel TOC in r2 */ - LOAD_REG_ADDR(r3, function_trace_op) - ld r5,0(r3) -#else - lis r3,function_trace_op@ha - lwz r5,function_trace_op@l(r3) -#endif - -#ifdef CONFIG_LIVEPATCH_64 - mr r14, r7 /* remember old NIP */ -#endif - - /* Calculate ip from nip-4 into r3 for call below */ - subi r3, r7, MCOUNT_INSN_SIZE - - /* Put the original return address in r4 as parent_ip */ - mr r4, r0 - - /* Save special regs */ - PPC_STL r8, _MSR(r1) - .if \allregs == 1 - PPC_STL r9, _CTR(r1) - PPC_STL r10, _XER(r1) - PPC_STL r11, _CCR(r1) - .endif - - /* Load &pt_regs in r6 for call below */ - addi r6, r1, STACK_INT_FRAME_REGS -.endm - -.macro ftrace_regs_exit allregs - /* Load ctr with the possibly modified NIP */ - PPC_LL r3, _NIP(r1) - mtctr r3 - -#ifdef CONFIG_LIVEPATCH_64 - cmpd r14, r3 /* has NIP been altered? */ -#endif - - /* Restore gprs */ - .if \allregs == 1 - REST_GPRS(2, 31, r1) - .else - REST_GPRS(3, 10, r1) -#ifdef CONFIG_LIVEPATCH_64 - REST_GPR(14, r1) -#endif - .endif - - /* Restore possibly modified LR */ - PPC_LL r0, _LINK(r1) - mtlr r0 - -#ifdef CONFIG_PPC64 - /* Restore callee's TOC */ - ld r2, STK_GOT(r1) -#endif - - /* Pop our stack frame */ - addi r1, r1, SWITCH_FRAME_SIZE - -#ifdef CONFIG_LIVEPATCH_64 - /* Based on the cmpd above, if the NIP was altered handle livepatch */ - bne- livepatch_handler -#endif - bctr /* jump after _mcount site */ -.endm - -_GLOBAL(ftrace_regs_caller) - ftrace_regs_entry 1 - /* ftrace_call(r3, r4, r5, r6) */ -.globl ftrace_regs_call -ftrace_regs_call: - bl ftrace_stub - nop - ftrace_regs_exit 1 - -_GLOBAL(ftrace_caller) - ftrace_regs_entry 0 - /* ftrace_call(r3, r4, r5, r6) */ -.globl ftrace_call -ftrace_call: - bl ftrace_stub - nop - ftrace_regs_exit 0 - -_GLOBAL(ftrace_stub) - blr - -#ifdef CONFIG_PPC64 -ftrace_no_trace: - mflr r3 - mtctr r3 - REST_GPR(3, r1) - addi r1, r1, SWITCH_FRAME_SIZE - mtlr r0 - bctr -#endif - -#ifdef CONFIG_LIVEPATCH_64 - /* - * This function runs in the mcount context, between two functions. As - * such it can only clobber registers which are volatile and used in - * function linkage. - * - * We get here when a function A, calls another function B, but B has - * been live patched with a new function C. - * - * On entry: - * - we have no stack frame and can not allocate one - * - LR points back to the original caller (in A) - * - CTR holds the new NIP in C - * - r0, r11 & r12 are free - */ -livepatch_handler: - ld r12, PACA_THREAD_INFO(r13) - - /* Allocate 3 x 8 bytes */ - ld r11, TI_livepatch_sp(r12) - addi r11, r11, 24 - std r11, TI_livepatch_sp(r12) - - /* Save toc & real LR on livepatch stack */ - std r2, -24(r11) - mflr r12 - std r12, -16(r11) - - /* Store stack end marker */ - lis r12, STACK_END_MAGIC@h - ori r12, r12, STACK_END_MAGIC@l - std r12, -8(r11) - - /* Put ctr in r12 for global entry and branch there */ - mfctr r12 - bctrl - - /* - * Now we are returning from the patched function to the original - * caller A. We are free to use r11, r12 and we can use r2 until we - * restore it. - */ - - ld r12, PACA_THREAD_INFO(r13) - - ld r11, TI_livepatch_sp(r12) - - /* Check stack marker hasn't been trashed */ - lis r2, STACK_END_MAGIC@h - ori r2, r2, STACK_END_MAGIC@l - ld r12, -8(r11) -1: tdne r12, r2 - EMIT_BUG_ENTRY 1b, __FILE__, __LINE__ - 1, 0 - - /* Restore LR & toc from livepatch stack */ - ld r12, -16(r11) - mtlr r12 - ld r2, -24(r11) - - /* Pop livepatch stack frame */ - ld r12, PACA_THREAD_INFO(r13) - subi r11, r11, 24 - std r11, TI_livepatch_sp(r12) - - /* Return to original caller of live patched function */ - blr -#endif /* CONFIG_LIVEPATCH */ |