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197aa0d465
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
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
#ifndef COSMOPOLITAN_LIBC_CALLS_UCONTEXT_H_
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#define COSMOPOLITAN_LIBC_CALLS_UCONTEXT_H_
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#include "libc/calls/struct/sigaltstack.h"
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#include "libc/calls/struct/sigset.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#ifdef __x86_64__
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struct XmmRegister {
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uint64_t u64[2];
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};
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struct FpuStackEntry {
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uint16_t significand[4];
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uint16_t exponent;
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uint16_t padding[3];
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};
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struct thatispacked FpuState {
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uint16_t cwd;
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uint16_t swd;
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uint16_t ftw;
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uint16_t fop;
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uint64_t rip;
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uint64_t rdp;
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uint32_t mxcsr;
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uint32_t mxcr_mask;
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struct FpuStackEntry st[8];
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struct XmmRegister xmm[16];
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uint32_t __padding[24];
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};
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typedef uint64_t greg_t;
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typedef greg_t gregset_t[23];
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typedef struct FpuState *fpregset_t;
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#endif /* __x86_64__ */
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struct sigcontext {
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#ifdef __x86_64__
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union {
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struct {
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uint64_t r8; /* 40 */
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uint64_t r9; /* 48 */
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uint64_t r10; /* 56 */
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uint64_t r11; /* 64 */
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uint64_t r12; /* 72 */
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uint64_t r13; /* 80 */
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uint64_t r14; /* 88 */
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uint64_t r15; /* 96 */
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uint64_t rdi; /* 104 */
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uint64_t rsi; /* 112 */
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uint64_t rbp; /* 120 */
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uint64_t rbx; /* 128 */
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uint64_t rdx; /* 136 */
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uint64_t rax; /* 144 */
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uint64_t rcx; /* 152 */
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uint64_t rsp; /* 160 */
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uint64_t rip; /* 168 */
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uint64_t eflags; /* 176 */
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uint16_t cs;
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uint16_t gs;
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uint16_t fs;
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uint16_t __pad0;
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uint64_t err;
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uint64_t trapno;
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uint64_t oldmask;
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uint64_t cr2;
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};
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gregset_t gregs;
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};
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struct FpuState *fpregs; /* zero when no fpu context */
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uint64_t __pad1[8];
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#elif defined(__aarch64__)
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uint64_t fault_address;
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uint64_t regs[31];
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uint64_t sp;
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uint64_t pc;
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uint64_t pstate;
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uint8_t __reserved[4096] __attribute__((__aligned__(16)));
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#endif /* __x86_64__ */
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};
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typedef struct sigcontext mcontext_t;
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struct ucontext {
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uint64_t uc_flags; /* don't use this */
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struct ucontext *uc_link;
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stack_t uc_stack;
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#ifdef __x86_64__
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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uint64_t __pad;
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struct FpuState __fpustate; /* for cosmo on non-linux */
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#elif defined(__aarch64__)
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sigset_t uc_sigmask;
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uint8_t __unused[1024 / 8 - sizeof(sigset_t)];
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struct sigcontext uc_mcontext;
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#endif
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};
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typedef struct ucontext ucontext_t;
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int getcontext(ucontext_t *) dontthrow;
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int setcontext(const ucontext_t *) dontthrow;
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int swapcontext(ucontext_t *, const ucontext_t *) dontthrow returnstwice;
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void makecontext(ucontext_t *, void (*)(), int, ...) dontthrow nocallback;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_CALLS_UCONTEXT_H_ */
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