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Implement swapcontext() and makecontext()

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This change introduces support for Linux-style uc_context manipulation
that's fast and works well on all supported OSes and architectures. It
also integrates with the Cosmpolitan runtime which can show backtraces
comprised of multiple stacks and fibers. See the test and example code
for further details. This will be used by Mold once it's been vendored
This commit is contained in:
Justine Tunney 2023-07-02 03:50:29 -07:00
parent 7ec84655b4
commit 197aa0d465
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GPG key ID: BE714B4575D6E328
28 changed files with 617 additions and 355 deletions
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42
libc/calls/ucontext.h
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@ -41,24 +41,24 @@ struct sigcontext {
#ifdef __x86_64__
union {
struct {
uint64_t r8;
uint64_t r9;
uint64_t r10;
uint64_t r11;
uint64_t r12;
uint64_t r13;
uint64_t r14;
uint64_t r15;
uint64_t rdi;
uint64_t rsi;
uint64_t rbp;
uint64_t rbx;
uint64_t rdx;
uint64_t rax;
uint64_t rcx;
uint64_t rsp;
uint64_t rip;
uint64_t eflags;
uint64_t r8; /* 40 */
uint64_t r9; /* 48 */
uint64_t r10; /* 56 */
uint64_t r11; /* 64 */
uint64_t r12; /* 72 */
uint64_t r13; /* 80 */
uint64_t r14; /* 88 */
uint64_t r15; /* 96 */
uint64_t rdi; /* 104 */
uint64_t rsi; /* 112 */
uint64_t rbp; /* 120 */
uint64_t rbx; /* 128 */
uint64_t rdx; /* 136 */
uint64_t rax; /* 144 */
uint64_t rcx; /* 152 */
uint64_t rsp; /* 160 */
uint64_t rip; /* 168 */
uint64_t eflags; /* 176 */
uint16_t cs;
uint16_t gs;
uint16_t fs;
@ -102,8 +102,10 @@ struct ucontext {
typedef struct ucontext ucontext_t;
int getcontext(ucontext_t *);
int setcontext(const ucontext_t *);
int getcontext(ucontext_t *) dontthrow;
int setcontext(const ucontext_t *) dontthrow;
int swapcontext(ucontext_t *, const ucontext_t *) dontthrow returnstwice;
void makecontext(ucontext_t *, void (*)(), int, ...) dontthrow nocallback;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */