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refactor

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This commit is contained in:
Marvin
2026-09-14 02:50:35 +02:00
parent cf3f1f9e99
commit 9e5ed517bc
45 changed files with 210 additions and 212 deletions
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kernel/arch/x86_64/usercopy.c
+4 -53
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@@ -18,7 +18,7 @@ bool arch_usercopy_read(void* dst, const __user void* src, size_t len, struct us
// Setup regs for `rep movsb`.
"xchg rcx, rdx\n"
"mov rax, [rip + %0]\n"
"mov [rdx], rax\n"
"xchg [rdx], rax\n"
".global x86_64_read_start\n"
"x86_64_read_start:\n"
@@ -35,7 +35,7 @@ bool arch_usercopy_read(void* dst, const __user void* src, size_t len, struct us
".global x86_64_read_fault\n"
"x86_64_read_fault:\n"
"xor rax, rax\n"
"mov [rdx], rax\n"
"xchg [rdx], rax\n"
"clac\n"
"ret\n"
:
@@ -61,7 +61,7 @@ bool arch_usercopy_write(__user void* dst, const void* src, size_t len, struct u
// Setup regs for `rep movsb`.
"xchg rcx, rdx\n"
"mov rax, [rip + %0]\n"
"mov [rdx], rax\n"
"xchg [rdx], rax\n"
".global x86_64_write_start\n"
"x86_64_write_start:\n"
@@ -78,7 +78,7 @@ bool arch_usercopy_write(__user void* dst, const void* src, size_t len, struct u
".global x86_64_write_fault\n"
"x86_64_write_fault:\n"
"xor rax, rax\n"
"mov [rdx], rax\n"
"xchg [rdx], rax\n"
"clac\n"
"ret\n"
:
@@ -86,52 +86,3 @@ bool arch_usercopy_write(__user void* dst, const void* src, size_t len, struct u
: "memory"
);
}
extern void x86_64_strlen_start();
extern void x86_64_strlen_end();
extern void x86_64_strlen_fault();
static const struct usercopy_region strlen_region = {
.start_ip = x86_64_strlen_start,
.end_ip = x86_64_strlen_end,
.fault_ip = x86_64_strlen_fault,
};
[[__naked]]
bool arch_usercopy_strlen(const __user char* str, size_t max, size_t* len, struct usercopy_region** region) {
asm volatile(
"stac\n"
"mov rax, [rip + %0]\n"
"mov [rcx], rax\n"
".global x86_64_strlen_start\n"
"x86_64_strlen_start:\n"
"xor r8, r8\n"
".Lloop:\n"
"cmp byte ptr [rdi + r8], 0\n"
"je .Lleave\n"
"inc r8\n"
"cmp rsi, r8\n"
"jne .Lloop\n"
".Lleave:\n"
"mov [rdx], r8\n"
".global x86_64_strlen_end\n"
"x86_64_strlen_end:\n"
"xor rax, rax\n"
"mov [rcx], rax\n"
"mov rax, 1\n"
"clac\n"
"ret\n"
".global x86_64_strlen_fault\n"
"x86_64_strlen_fault:\n"
"xor rax, rax\n"
"mov [rcx], rax\n"
"clac\n"
"ret\n"
:
: "i"(&strlen_region)
: "memory"
);
}