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Add RISC-V variants of the ftrace-direct* samples. Tested-by: Evgenii Shatokhin <e.shatokhin@yadro.com> Signed-off-by: Song Shuai <suagrfillet@gmail.com> Tested-by: Guo Ren <guoren@kernel.org> Signed-off-by: Guo Ren <guoren@kernel.org> Acked-by: Björn Töpel <bjorn@rivosinc.com> Link: https://lore.kernel.org/r/20231130121531.1178502-5-bjorn@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/module.h>
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#include <linux/mm.h> /* for handle_mm_fault() */
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#include <linux/ftrace.h>
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#include <linux/sched/stat.h>
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#ifndef CONFIG_ARM64
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#include <asm/asm-offsets.h>
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#endif
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extern void my_direct_func(unsigned long ip);
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void my_direct_func(unsigned long ip)
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{
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trace_printk("ip %lx\n", ip);
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}
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extern void my_tramp(void *);
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#ifdef CONFIG_RISCV
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#include <asm/asm.h>
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:\n"
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" addi sp,sp,-3*"SZREG"\n"
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" "REG_S" a0,0*"SZREG"(sp)\n"
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" "REG_S" t0,1*"SZREG"(sp)\n"
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" "REG_S" ra,2*"SZREG"(sp)\n"
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" mv a0,t0\n"
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" call my_direct_func\n"
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" "REG_L" a0,0*"SZREG"(sp)\n"
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" "REG_L" t0,1*"SZREG"(sp)\n"
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" "REG_L" ra,2*"SZREG"(sp)\n"
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" addi sp,sp,3*"SZREG"\n"
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" jr t0\n"
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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#endif /* CONFIG_RISCV */
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#ifdef CONFIG_X86_64
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#include <asm/ibt.h>
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#include <asm/nospec-branch.h>
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:"
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ASM_ENDBR
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" pushq %rbp\n"
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" movq %rsp, %rbp\n"
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CALL_DEPTH_ACCOUNT
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" pushq %rdi\n"
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" movq 8(%rbp), %rdi\n"
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" call my_direct_func\n"
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" popq %rdi\n"
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" leave\n"
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ASM_RET
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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#endif /* CONFIG_X86_64 */
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#ifdef CONFIG_S390
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:"
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" lgr %r1,%r15\n"
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" stmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
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" stg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
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" aghi %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
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" stg %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
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" lgr %r2,%r0\n"
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" brasl %r14,my_direct_func\n"
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" aghi %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
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" lmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
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" lg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
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" lgr %r1,%r0\n"
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" br %r1\n"
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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#endif /* CONFIG_S390 */
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#ifdef CONFIG_ARM64
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:"
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" hint 34\n" // bti c
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" sub sp, sp, #32\n"
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" stp x9, x30, [sp]\n"
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" str x0, [sp, #16]\n"
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" mov x0, x30\n"
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" bl my_direct_func\n"
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" ldp x30, x9, [sp]\n"
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" ldr x0, [sp, #16]\n"
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" add sp, sp, #32\n"
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" ret x9\n"
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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#endif /* CONFIG_ARM64 */
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#ifdef CONFIG_LOONGARCH
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#include <asm/asm.h>
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asm (
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" .pushsection .text, \"ax\", @progbits\n"
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" .type my_tramp, @function\n"
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" .globl my_tramp\n"
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" my_tramp:\n"
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" addi.d $sp, $sp, -32\n"
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" st.d $a0, $sp, 0\n"
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" st.d $t0, $sp, 8\n"
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" st.d $ra, $sp, 16\n"
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" move $a0, $t0\n"
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" bl my_direct_func\n"
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" ld.d $a0, $sp, 0\n"
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" ld.d $t0, $sp, 8\n"
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" ld.d $ra, $sp, 16\n"
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" addi.d $sp, $sp, 32\n"
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" jr $t0\n"
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" .size my_tramp, .-my_tramp\n"
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" .popsection\n"
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);
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#endif /* CONFIG_LOONGARCH */
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static struct ftrace_ops direct;
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static int __init ftrace_direct_multi_init(void)
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{
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ftrace_set_filter_ip(&direct, (unsigned long) wake_up_process, 0, 0);
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ftrace_set_filter_ip(&direct, (unsigned long) schedule, 0, 0);
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return register_ftrace_direct(&direct, (unsigned long) my_tramp);
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}
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static void __exit ftrace_direct_multi_exit(void)
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{
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unregister_ftrace_direct(&direct, (unsigned long) my_tramp, true);
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}
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module_init(ftrace_direct_multi_init);
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module_exit(ftrace_direct_multi_exit);
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MODULE_AUTHOR("Jiri Olsa");
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MODULE_DESCRIPTION("Example use case of using register_ftrace_direct_multi()");
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MODULE_LICENSE("GPL");
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