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LibC: Save callee-saved floating-point registers in setjmp for riscv64

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Sönke Holz 2024-02-21 18:18:14 +01:00 • committed by Jelle Raaijmakers
parent 420c54a21b
commit a203837b1f
2 changed files with 34 additions and 5 deletions
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36
Userland/Libraries/LibC/arch/riscv64/setjmp.S
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@ -56,8 +56,22 @@ sigsetjmp:
sd s9, 9*8(a0)
sd s10, 10*8(a0)
sd s11, 11*8(a0)
sd sp, 12*8(a0)
sd ra, 13*8(a0)
fsd fs0, 12*8(a0) // Save floating-point registers
fsd fs1, 13*8(a0) // NOTE: We only support ABI_FLEN=64 in LibELF/Validation.cpp,
fsd fs2, 14*8(a0) // so we only save the lower 64 bits of the fs* registers.
fsd fs3, 15*8(a0)
fsd fs4, 16*8(a0)
fsd fs5, 17*8(a0)
fsd fs6, 18*8(a0)
fsd fs7, 19*8(a0)
fsd fs8, 20*8(a0)
fsd fs9, 21*8(a0)
fsd fs10, 22*8(a0)
fsd fs11, 23*8(a0)
sd sp, 24*8(a0)
sd ra, 25*8(a0)
li a0, 0
ret
@ -81,8 +95,22 @@ longjmp:
ld s9, 9*8(a0)
ld s10, 10*8(a0)
ld s11, 11*8(a0)
ld sp, 12*8(a0)
ld ra, 13*8(a0)
fld fs0, 12*8(a0) // Restore floating-point registers
fld fs1, 13*8(a0) // NOTE: We only support ABI_FLEN=64 in LibELF/Validation.cpp,
fld fs2, 14*8(a0) // so we only restore the lower 64 bits of the fs* registers.
fld fs3, 15*8(a0)
fld fs4, 16*8(a0)
fld fs5, 17*8(a0)
fld fs6, 18*8(a0)
fld fs7, 19*8(a0)
fld fs8, 20*8(a0)
fld fs9, 21*8(a0)
fld fs10, 22*8(a0)
fld fs11, 23*8(a0)
ld sp, 24*8(a0)
ld ra, 25*8(a0)
mv a0, a1
bnez a0, .Lnonzero

3
Userland/Libraries/LibC/setjmp.h
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@ -33,6 +33,7 @@ struct __jmp_buf {
uint64_t regs[22];
#elif defined(__riscv) && __riscv_xlen == 64
uint64_t s[12];
uint64_t fs[12];
uint64_t sp;
uint64_t ra;
#else
@ -54,7 +55,7 @@ static_assert(sizeof(struct __jmp_buf) == 72, "struct __jmp_buf unsynchronized w
# elif defined(__aarch64__)
static_assert(sizeof(struct __jmp_buf) == 184, "struct __jmp_buf unsynchronized with aarch64/setjmp.S");
# elif defined(__riscv) && __riscv_xlen == 64
static_assert(sizeof(struct __jmp_buf) == 120, "struct __jmp_buf unsynchronized with riscv64/setjmp.S");
static_assert(sizeof(struct __jmp_buf) == 216, "struct __jmp_buf unsynchronized with riscv64/setjmp.S");
# else
# error "Unknown architecture"
# endif