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Add riscv64 support for libcontext 

modified to match function arguments different from upstream

Author: Andreas Schwab
This commit is contained in:
alexfanqi 2022-01-25 13:47:06 +11:00 committed by Wayne Stambaugh
parent 2345e09a12
commit 01f0aad7c0
2 changed files with 113 additions and 0 deletions
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108
thirdparty/libcontext/libcontext.cpp vendored
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@ -1444,6 +1444,114 @@ __asm (
#endif
#if defined(LIBCONTEXT_PLATFORM_linux_riscv64) && defined(LIBCONTEXT_COMPILER_gcc)
__asm (
".text\n"
".align 1\n"
".global jump_fcontext\n"
".type jump_fcontext, %function\n"
"jump_fcontext:\n"
" # prepare stack for GP + FPU\n"
" addi sp, sp, -0xd0\n"
" # save fs0 - fs11\n"
" fsd fs0, 0x00(sp)\n"
" fsd fs1, 0x08(sp)\n"
" fsd fs2, 0x10(sp)\n"
" fsd fs3, 0x18(sp)\n"
" fsd fs4, 0x20(sp)\n"
" fsd fs5, 0x28(sp)\n"
" fsd fs6, 0x30(sp)\n"
" fsd fs7, 0x38(sp)\n"
" fsd fs8, 0x40(sp)\n"
" fsd fs9, 0x48(sp)\n"
" fsd fs10, 0x50(sp)\n"
" fsd fs11, 0x58(sp)\n"
" # save s0-s11, ra\n"
" sd s0, 0x60(sp)\n"
" sd s1, 0x68(sp)\n"
" sd s2, 0x70(sp)\n"
" sd s3, 0x78(sp)\n"
" sd s4, 0x80(sp)\n"
" sd s5, 0x88(sp)\n"
" sd s6, 0x90(sp)\n"
" sd s7, 0x98(sp)\n"
" sd s8, 0xa0(sp)\n"
" sd s9, 0xa8(sp)\n"
" sd s10, 0xb0(sp)\n"
" sd s11, 0xb8(sp)\n"
" sd ra, 0xc0(sp)\n"
" # save RA as PC\n"
" sd ra, 0xc8(sp)\n"
" # store SP in the first arg(pointer to fcontext_t)\n"
" sd sp, 0x00(a0)\n"
" # restore SP from the second arg(fcontext_t)\n"
" mv sp, a1\n"
" # load fs0 - fs11\n"
" fld fs0, 0x00(sp)\n"
" fld fs1, 0x08(sp)\n"
" fld fs2, 0x10(sp)\n"
" fld fs3, 0x18(sp)\n"
" fld fs4, 0x20(sp)\n"
" fld fs5, 0x28(sp)\n"
" fld fs6, 0x30(sp)\n"
" fld fs7, 0x38(sp)\n"
" fld fs8, 0x40(sp)\n"
" fld fs9, 0x48(sp)\n"
" fld fs10, 0x50(sp)\n"
" fld fs11, 0x58(sp)\n"
" # load s0-s11,ra\n"
" ld s0, 0x60(sp)\n"
" ld s1, 0x68(sp)\n"
" ld s2, 0x70(sp)\n"
" ld s3, 0x78(sp)\n"
" ld s4, 0x80(sp)\n"
" ld s5, 0x88(sp)\n"
" ld s6, 0x90(sp)\n"
" ld s7, 0x98(sp)\n"
" ld s8, 0xa0(sp)\n"
" ld s9, 0xa8(sp)\n"
" ld s10, 0xb0(sp)\n"
" ld s11, 0xb8(sp)\n"
" ld ra, 0xc0(sp)\n"
" # use the third arg as return value\n"
" mv a0, a2\n"
" # load pc from new context\n"
" ld a4, 0xc8(sp)\n"
" # restore stack from GP + FPU\n"
" addi sp, sp, 0xd0\n"
" jr a4\n"
".size jump_fcontext,.-jump_fcontext\n"
);
#endif
#if defined(LIBCONTEXT_PLATFORM_linux_riscv64) && defined(LIBCONTEXT_COMPILER_gcc)
__asm (
".text\n"
".align 1\n"
".global make_fcontext\n"
".type make_fcontext, %function\n"
"make_fcontext:\n"
" # shift address in a0 (allocated stack) to lower 16 byte boundary\n"
" andi a0, a0, ~0xF\n"
" # reserve space for context-data on context-stack\n"
" addi a0, a0, -0xd0\n"
" # third arg of make_fcontext() == address of context-function\n"
" # store address as a PC to jump in\n"
" sd a2, 0xc8(a0)\n"
" # save address of finish as return-address for context-function\n"
" # will be entered after context-function returns (RA register)\n"
" lla a4, finish\n"
" sd a4, 0xc0(a0)\n"
" ret # return pointer to context-data (a0)\n"
"finish:\n"
" # exit code is zero\n"
" li a0, 0\n"
" # exit application\n"
" tail _exit@plt\n"
".size make_fcontext,.-make_fcontext\n"
);
#endif
#if defined(LIBCONTEXT_USE_WINFIBER) && (defined(LIBCONTEXT_PLATFORM_msvc_x86_64) || defined(LIBCONTEXT_PLATFORM_msvc_i386))
#include <map>

5
thirdparty/libcontext/libcontext.h vendored
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@ -55,6 +55,11 @@
#define LIBCONTEXT_PLATFORM_linux_ppc32
#define LIBCONTEXT_CALL_CONVENTION
#endif
#elif defined(__riscv)
#if __riscv_xlen == 64
#define LIBCONTEXT_PLATFORM_linux_riscv64
#define LIBCONTEXT_CALL_CONVENTION
#endif
#endif
#elif defined(__MINGW32__) || defined(__MINGW64__)