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fiber: save contexts without compiler frames

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This commit is contained in:
Chai T
2026-08-28 05:32:20 +04:00
committed by nmzik
parent 4cc2f00273
commit c52bf450f5
1 changed files with 32 additions and 39 deletions
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src/libs/libKernel.cpp
+32 -39
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@@ -2458,47 +2458,40 @@ static void FiberSetContextValid(FiberObject* fiber, bool valid) {
} }
#if defined(__x86_64__) || defined(_M_X64) #if defined(__x86_64__) || defined(_M_X64)
__attribute__((noinline, returns_twice)) static int FiberSaveContext(FiberCpuContext* ctx) { [[gnu::naked,
int ret = 0; gnu::returns_twice]] static KYTY_SYSV_ABI int FiberSaveContext(FiberCpuContext* /*ctx*/) {
asm volatile("movq %[ctx], %%r10\n\t" asm volatile("movq %rdi, %r10\n\t"
"movq %%rbx, 0(%%r10)\n\t" "movq %rbx, 0(%r10)\n\t"
"movq %%rbp, 8(%%r10)\n\t" "movq %rbp, 8(%r10)\n\t"
"movq %%rdi, 16(%%r10)\n\t" "movq %rdi, 16(%r10)\n\t"
"movq %%rsi, 24(%%r10)\n\t" "movq %rsi, 24(%r10)\n\t"
"movq %%r12, 32(%%r10)\n\t" "movq %r12, 32(%r10)\n\t"
"movq %%r13, 40(%%r10)\n\t" "movq %r13, 40(%r10)\n\t"
"movq %%r14, 48(%%r10)\n\t" "movq %r14, 48(%r10)\n\t"
"movq %%r15, 56(%%r10)\n\t" "movq %r15, 56(%r10)\n\t"
"leaq 8(%%rsp), %%r11\n\t" "leaq 8(%rsp), %r11\n\t"
"movq %%r11, 64(%%r10)\n\t" "movq %r11, 64(%r10)\n\t"
"movq (%%rsp), %%r11\n\t" "movq (%rsp), %r11\n\t"
"movq %%r11, 72(%%r10)\n\t" "movq %r11, 72(%r10)\n\t"
"xorl %%eax, %%eax\n\t" "xorl %eax, %eax\n\t"
: "=a"(ret) "retq\n");
: [ctx] "r"(ctx)
: "memory", "r10", "r11");
return ret;
} }
__attribute__((noreturn, noinline)) static void FiberRestoreContext(FiberCpuContext* ctx, [[gnu::naked, gnu::noreturn]] static KYTY_SYSV_ABI void
uint64_t ret) { FiberRestoreContext(FiberCpuContext* /*ctx*/, uint64_t /*ret*/) {
asm volatile("movq %[ctx], %%r10\n\t" asm volatile("movq %rdi, %r10\n\t"
"movq 72(%%r10), %%r11\n\t" "movq %rsi, %rax\n\t"
"movq 0(%%r10), %%rbx\n\t" "movq 72(%r10), %r11\n\t"
"movq 8(%%r10), %%rbp\n\t" "movq 0(%r10), %rbx\n\t"
"movq 16(%%r10), %%rdi\n\t" "movq 8(%r10), %rbp\n\t"
"movq 24(%%r10), %%rsi\n\t" "movq 16(%r10), %rdi\n\t"
"movq 32(%%r10), %%r12\n\t" "movq 24(%r10), %rsi\n\t"
"movq 40(%%r10), %%r13\n\t" "movq 32(%r10), %r12\n\t"
"movq 48(%%r10), %%r14\n\t" "movq 40(%r10), %r13\n\t"
"movq 56(%%r10), %%r15\n\t" "movq 48(%r10), %r14\n\t"
"movq 64(%%r10), %%rsp\n\t" "movq 56(%r10), %r15\n\t"
"movq %[ret], %%rax\n\t" "movq 64(%r10), %rsp\n\t"
"jmp *%%r11\n\t" "jmp *%r11\n");
:
: [ctx] "r"(ctx), [ret] "r"(ret)
: "memory", "rax", "r10", "r11");
__builtin_unreachable();
} }
#else #else
static int FiberSaveContext(FiberCpuContext* ctx) { static int FiberSaveContext(FiberCpuContext* ctx) {