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[RISCV] Support rv{32, 64}e in the compiler builtins (#88252)

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Register spills (save/restore) in RISC-V embedded work differently
because there are less registers and different stack alignment.

[GCC equivalent
](https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/riscv/save-restore.S#L298C16-L336)

Follow up from #76777.

---------

Signed-off-by: xermicus <cyrill@parity.io>
(cherry picked from commit bd32aaa8c9ec2094f605315b3989adc2a567ca98)
This commit is contained in:
Cyrill Leutwiler 2024-04-11 07:11:51 +02:00 committed by Tom Stellard
parent c24b41d71f
commit eaae766a20
2 changed files with 84 additions and 0 deletions
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42
compiler-rt/lib/builtins/riscv/restore.S
View File

@ -22,6 +22,8 @@
#if __riscv_xlen == 32
#ifndef __riscv_32e
.globl __riscv_restore_12
.type __riscv_restore_12,@function
__riscv_restore_12:
@ -86,8 +88,29 @@ __riscv_restore_0:
addi sp, sp, 16
ret
#else
.globl __riscv_restore_2
.type __riscv_restore_2,@function
.globl __riscv_restore_1
.type __riscv_restore_1,@function
.globl __riscv_restore_0
.type __riscv_restore_0,@function
__riscv_restore_2:
__riscv_restore_1:
__riscv_restore_0:
lw s1, 0(sp)
lw s0, 4(sp)
lw ra, 8(sp)
addi sp, sp, 12
ret
#endif
#elif __riscv_xlen == 64
#ifndef __riscv_64e
.globl __riscv_restore_12
.type __riscv_restore_12,@function
__riscv_restore_12:
@ -161,6 +184,25 @@ __riscv_restore_0:
addi sp, sp, 16
ret
#else
.globl __riscv_restore_2
.type __riscv_restore_2,@function
.globl __riscv_restore_1
.type __riscv_restore_1,@function
.globl __riscv_restore_0
.type __riscv_restore_0,@function
__riscv_restore_2:
__riscv_restore_1:
__riscv_restore_0:
ld s1, 0(sp)
ld s0, 8(sp)
ld ra, 16(sp)
addi sp, sp, 24
ret
#endif
#else
# error "xlen must be 32 or 64 for save-restore implementation
#endif

42
compiler-rt/lib/builtins/riscv/save.S
View File

@ -18,6 +18,8 @@
#if __riscv_xlen == 32
#ifndef __riscv_32e
.globl __riscv_save_12
.type __riscv_save_12,@function
__riscv_save_12:
@ -92,8 +94,29 @@ __riscv_save_0:
sw ra, 12(sp)
jr t0
#else
.globl __riscv_save_2
.type __riscv_save_2,@function
.globl __riscv_save_1
.type __riscv_save_1,@function
.globl __riscv_save_0
.type __riscv_save_0,@function
__riscv_save_2:
__riscv_save_1:
__riscv_save_0:
addi sp, sp, -12
sw s1, 0(sp)
sw s0, 4(sp)
sw ra, 8(sp)
jr t0
#endif
#elif __riscv_xlen == 64
#ifndef __riscv_64e
.globl __riscv_save_12
.type __riscv_save_12,@function
__riscv_save_12:
@ -181,6 +204,25 @@ __riscv_save_0:
sd ra, 8(sp)
jr t0
#else
.globl __riscv_save_2
.type __riscv_save_2,@function
.globl __riscv_save_1
.type __riscv_save_1,@function
.globl __riscv_save_0
.type __riscv_save_0,@function
__riscv_save_2:
__riscv_save_1:
__riscv_save_0:
addi sp, sp, -24
sd s1, 0(sp)
sd s0, 8(sp)
sd ra, 16(sp)
jr t0
#endif
#else
# error "xlen must be 32 or 64 for save-restore implementation
#endif