From 9999e48639b3cecb08ffb37358bcba3b48161b29 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 08:50:17 +0000
Subject: [PATCH] add ax88772_rst
---
kernel/arch/mips/kernel/ftrace.c | 39 ++++++++++++++++++---------------------
1 files changed, 18 insertions(+), 21 deletions(-)
diff --git a/kernel/arch/mips/kernel/ftrace.c b/kernel/arch/mips/kernel/ftrace.c
index b122cbb..f57e68f 100644
--- a/kernel/arch/mips/kernel/ftrace.c
+++ b/kernel/arch/mips/kernel/ftrace.c
@@ -37,10 +37,6 @@
ftrace_modify_all_code(command);
}
-#endif
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-
#define JAL 0x0c000000 /* jump & link: ip --> ra, jump to target */
#define ADDR_MASK 0x03ffffff /* op_code|addr : 31...26|25 ....0 */
#define JUMP_RANGE_MASK ((1UL << 28) - 1)
@@ -86,7 +82,7 @@
return -EFAULT;
old_fs = get_fs();
- set_fs(get_ds());
+ set_fs(KERNEL_DS);
flush_icache_range(ip, ip + 8);
set_fs(old_fs);
@@ -111,7 +107,7 @@
ip -= 4;
old_fs = get_fs();
- set_fs(get_ds());
+ set_fs(KERNEL_DS);
flush_icache_range(ip, ip + 8);
set_fs(old_fs);
@@ -135,7 +131,7 @@
return -EFAULT;
old_fs = get_fs();
- set_fs(get_ds());
+ set_fs(KERNEL_DS);
flush_icache_range(ip, ip + 8);
set_fs(old_fs);
@@ -333,20 +329,21 @@
return;
/*
- * "parent_ra_addr" is the stack address saved the return address of
- * the caller of _mcount.
+ * "parent_ra_addr" is the stack address where the return address of
+ * the caller of _mcount is saved.
*
- * if the gcc < 4.5, a leaf function does not save the return address
- * in the stack address, so, we "emulate" one in _mcount's stack space,
- * and hijack it directly, but for a non-leaf function, it save the
- * return address to the its own stack space, we can not hijack it
- * directly, but need to find the real stack address,
- * ftrace_get_parent_addr() does it!
+ * If gcc < 4.5, a leaf function does not save the return address
+ * in the stack address, so we "emulate" one in _mcount's stack space,
+ * and hijack it directly.
+ * For a non-leaf function, it does save the return address to its own
+ * stack space, so we can not hijack it directly, but need to find the
+ * real stack address, which is done by ftrace_get_parent_addr().
*
- * if gcc>= 4.5, with the new -mmcount-ra-address option, for a
+ * If gcc >= 4.5, with the new -mmcount-ra-address option, for a
* non-leaf function, the location of the return address will be saved
- * to $12 for us, and for a leaf function, only put a zero into $12. we
- * do it in ftrace_graph_caller of mcount.S.
+ * to $12 for us.
+ * For a leaf function, it just puts a zero into $12, so we handle
+ * it in ftrace_graph_caller() of mcount.S.
*/
/* old_parent_ra = *parent_ra_addr; */
@@ -400,13 +397,13 @@
unsigned long __init arch_syscall_addr(int nr)
{
#ifdef CONFIG_MIPS32_N32
- if (nr >= __NR_N32_Linux && nr <= __NR_N32_Linux + __NR_N32_Linux_syscalls)
+ if (nr >= __NR_N32_Linux && nr < __NR_N32_Linux + __NR_N32_Linux_syscalls)
return (unsigned long)sysn32_call_table[nr - __NR_N32_Linux];
#endif
- if (nr >= __NR_64_Linux && nr <= __NR_64_Linux + __NR_64_Linux_syscalls)
+ if (nr >= __NR_64_Linux && nr < __NR_64_Linux + __NR_64_Linux_syscalls)
return (unsigned long)sys_call_table[nr - __NR_64_Linux];
#ifdef CONFIG_MIPS32_O32
- if (nr >= __NR_O32_Linux && nr <= __NR_O32_Linux + __NR_O32_Linux_syscalls)
+ if (nr >= __NR_O32_Linux && nr < __NR_O32_Linux + __NR_O32_Linux_syscalls)
return (unsigned long)sys32_call_table[nr - __NR_O32_Linux];
#endif
--
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