mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
611c9d8830
1, Better backtraces for humanization; 2, Relay BCE exceptions to userland as SIGSEGV; 3, Provide kernel fpu functions; 4, Optimize memory ops (memset/memcpy/memmove); 5, Optimize checksum and crc32(c) calculation; 6, Add ARCH_HAS_FORTIFY_SOURCE selection; 7, Add function error injection support; 8, Add ftrace with direct call support; 9, Add basic perf tools support. -----BEGIN PGP SIGNATURE----- iQJKBAABCAA0FiEEzOlt8mkP+tbeiYy5AoYrw/LiJnoFAmRQlUsWHGNoZW5odWFj YWlAa2VybmVsLm9yZwAKCRAChivD8uImekCTD/9fc2U+FIXhJOWV5yK9TCjJTRnK ASvk0JMYIDA60+fnof3C85tDu9Py9M5Mvt/Ec5pBaHErn16irq85AdD74/OmyCc2 V4pRFHbYLu0WBFQN77gfNXH0XErgYXdceZvaMXajVz2H6NlSKSWZOVN/9ut5SLi3 mt0rCwCsyahj92n8+hOjjZeFbDaPfPMCQ/8n9dnadhbBm9iz35fOKY+qIBHJMJ9a wPfZ2k3wu5DHs/2+ZjFNhlwrlURTp3RlcVQ7QWDcR1LM3Z4/lEkD8tAI/r8sR9gw rxzoBSaQzo/zscUmYo0jh1BoW2w0n+x/GfH70Pyz3iwZky3jwpdP0nRwnB4h+tnE wKlpa5K7RfaqUxZExFfGALmlkALtjQgiXPYbORHMsD6l6XwrOMCeyQismm1oo66m JBlsdXCms5aracYmWhXnVmTlBqGjAgYAxm62ap62uwlmULy4qUv6kFeW0fERn9NJ 5bKgbrkcal/WkMBawQqtG03niRkykqpqFooZ95ubj4Lib4VM0BmEvFrREjgXO7AE jpLimYsT9ROE3YQJqyWyLYkmc2ShwWj70INTpz2viMtQ2blIRKvRVsxs976bHuwS mGsZtiiANjhT2bAUhN7bct2Cf13MtPXiuf0etcJbrNSAtoBIFk+3uRRKHH2rM+CK oKYjO+exPyuQ9nSOBg== =3aTV -----END PGP SIGNATURE----- Merge tag 'loongarch-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson Pull LoongArch updates from Huacai Chen: - Better backtraces for humanization - Relay BCE exceptions to userland as SIGSEGV - Provide kernel fpu functions - Optimize memory ops (memset/memcpy/memmove) - Optimize checksum and crc32(c) calculation - Add ARCH_HAS_FORTIFY_SOURCE selection - Add function error injection support - Add ftrace with direct call support - Add basic perf tools support * tag 'loongarch-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (24 commits) tools/perf: Add basic support for LoongArch LoongArch: ftrace: Add direct call trampoline samples support LoongArch: ftrace: Add direct call support LoongArch: ftrace: Implement ftrace_find_callable_addr() to simplify code LoongArch: ftrace: Fix build error if DYNAMIC_FTRACE_WITH_REGS is not set LoongArch: ftrace: Abstract DYNAMIC_FTRACE_WITH_ARGS accesses LoongArch: Add support for function error injection LoongArch: Add ARCH_HAS_FORTIFY_SOURCE selection LoongArch: crypto: Add crc32 and crc32c hw acceleration LoongArch: Add checksum optimization for 64-bit system LoongArch: Optimize memory ops (memset/memcpy/memmove) LoongArch: Provide kernel fpu functions LoongArch: Relay BCE exceptions to userland as SIGSEGV with si_code=SEGV_BNDERR LoongArch: Tweak the BADV and CPUCFG.PRID lines in show_regs() LoongArch: Humanize the ESTAT line when showing registers LoongArch: Humanize the ECFG line when showing registers LoongArch: Humanize the EUEN line when showing registers LoongArch: Humanize the PRMD line when showing registers LoongArch: Humanize the CRMD line when showing registers LoongArch: Fix format of CSR lines during show_regs() ...
188 lines
4.0 KiB
C
188 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/module.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/ftrace.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
extern void my_direct_func1(void);
|
|
extern void my_direct_func2(void);
|
|
|
|
void my_direct_func1(void)
|
|
{
|
|
trace_printk("my direct func1\n");
|
|
}
|
|
|
|
void my_direct_func2(void)
|
|
{
|
|
trace_printk("my direct func2\n");
|
|
}
|
|
|
|
extern void my_tramp1(void *);
|
|
extern void my_tramp2(void *);
|
|
|
|
static unsigned long my_ip = (unsigned long)schedule;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#include <asm/ibt.h>
|
|
#include <asm/nospec-branch.h>
|
|
|
|
asm (
|
|
" .pushsection .text, \"ax\", @progbits\n"
|
|
" .type my_tramp1, @function\n"
|
|
" .globl my_tramp1\n"
|
|
" my_tramp1:"
|
|
ASM_ENDBR
|
|
" pushq %rbp\n"
|
|
" movq %rsp, %rbp\n"
|
|
CALL_DEPTH_ACCOUNT
|
|
" call my_direct_func1\n"
|
|
" leave\n"
|
|
" .size my_tramp1, .-my_tramp1\n"
|
|
ASM_RET
|
|
|
|
" .type my_tramp2, @function\n"
|
|
" .globl my_tramp2\n"
|
|
" my_tramp2:"
|
|
ASM_ENDBR
|
|
" pushq %rbp\n"
|
|
" movq %rsp, %rbp\n"
|
|
CALL_DEPTH_ACCOUNT
|
|
" call my_direct_func2\n"
|
|
" leave\n"
|
|
ASM_RET
|
|
" .size my_tramp2, .-my_tramp2\n"
|
|
" .popsection\n"
|
|
);
|
|
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
#ifdef CONFIG_S390
|
|
|
|
asm (
|
|
" .pushsection .text, \"ax\", @progbits\n"
|
|
" .type my_tramp1, @function\n"
|
|
" .globl my_tramp1\n"
|
|
" my_tramp1:"
|
|
" lgr %r1,%r15\n"
|
|
" stmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
|
|
" stg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
|
|
" aghi %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
|
|
" stg %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
|
|
" brasl %r14,my_direct_func1\n"
|
|
" aghi %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
|
|
" lmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
|
|
" lg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
|
|
" lgr %r1,%r0\n"
|
|
" br %r1\n"
|
|
" .size my_tramp1, .-my_tramp1\n"
|
|
" .type my_tramp2, @function\n"
|
|
" .globl my_tramp2\n"
|
|
" my_tramp2:"
|
|
" lgr %r1,%r15\n"
|
|
" stmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
|
|
" stg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
|
|
" aghi %r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"
|
|
" stg %r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"
|
|
" brasl %r14,my_direct_func2\n"
|
|
" aghi %r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"
|
|
" lmg %r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"
|
|
" lg %r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"
|
|
" lgr %r1,%r0\n"
|
|
" br %r1\n"
|
|
" .size my_tramp2, .-my_tramp2\n"
|
|
" .popsection\n"
|
|
);
|
|
|
|
#endif /* CONFIG_S390 */
|
|
|
|
#ifdef CONFIG_LOONGARCH
|
|
|
|
asm (
|
|
" .pushsection .text, \"ax\", @progbits\n"
|
|
" .type my_tramp1, @function\n"
|
|
" .globl my_tramp1\n"
|
|
" my_tramp1:\n"
|
|
" addi.d $sp, $sp, -16\n"
|
|
" st.d $t0, $sp, 0\n"
|
|
" st.d $ra, $sp, 8\n"
|
|
" bl my_direct_func1\n"
|
|
" ld.d $t0, $sp, 0\n"
|
|
" ld.d $ra, $sp, 8\n"
|
|
" addi.d $sp, $sp, 16\n"
|
|
" jr $t0\n"
|
|
" .size my_tramp1, .-my_tramp1\n"
|
|
|
|
" .type my_tramp2, @function\n"
|
|
" .globl my_tramp2\n"
|
|
" my_tramp2:\n"
|
|
" addi.d $sp, $sp, -16\n"
|
|
" st.d $t0, $sp, 0\n"
|
|
" st.d $ra, $sp, 8\n"
|
|
" bl my_direct_func2\n"
|
|
" ld.d $t0, $sp, 0\n"
|
|
" ld.d $ra, $sp, 8\n"
|
|
" addi.d $sp, $sp, 16\n"
|
|
" jr $t0\n"
|
|
" .size my_tramp2, .-my_tramp2\n"
|
|
" .popsection\n"
|
|
);
|
|
|
|
#endif /* CONFIG_LOONGARCH */
|
|
|
|
static struct ftrace_ops direct;
|
|
|
|
static unsigned long my_tramp = (unsigned long)my_tramp1;
|
|
static unsigned long tramps[2] = {
|
|
(unsigned long)my_tramp1,
|
|
(unsigned long)my_tramp2,
|
|
};
|
|
|
|
static int simple_thread(void *arg)
|
|
{
|
|
static int t;
|
|
int ret = 0;
|
|
|
|
while (!kthread_should_stop()) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(2 * HZ);
|
|
|
|
if (ret)
|
|
continue;
|
|
t ^= 1;
|
|
ret = modify_ftrace_direct(&direct, tramps[t]);
|
|
if (!ret)
|
|
my_tramp = tramps[t];
|
|
WARN_ON_ONCE(ret);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct task_struct *simple_tsk;
|
|
|
|
static int __init ftrace_direct_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ftrace_set_filter_ip(&direct, (unsigned long) my_ip, 0, 0);
|
|
ret = register_ftrace_direct(&direct, my_tramp);
|
|
|
|
if (!ret)
|
|
simple_tsk = kthread_run(simple_thread, NULL, "event-sample-fn");
|
|
return ret;
|
|
}
|
|
|
|
static void __exit ftrace_direct_exit(void)
|
|
{
|
|
kthread_stop(simple_tsk);
|
|
unregister_ftrace_direct(&direct, my_tramp, true);
|
|
}
|
|
|
|
module_init(ftrace_direct_init);
|
|
module_exit(ftrace_direct_exit);
|
|
|
|
MODULE_AUTHOR("Steven Rostedt");
|
|
MODULE_DESCRIPTION("Example use case of using modify_ftrace_direct()");
|
|
MODULE_LICENSE("GPL");
|