Bricoles/xv6-riscv
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kernelvec only needs to save caller-saved registers

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This commit is contained in:
Robert Morris 2023-10-14 06:23:09 -04:00
parent 74c1eba516
commit 0c32c04b29
1 changed files with 2 additions and 26 deletions

28
kernel/kernelvec.S
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@ -3,7 +3,7 @@
# mode come here.
#
# the current stack is a kernel stack.
# push all registers, call kerneltrap().
# push registers, call kerneltrap().
# when kerneltrap() returns, restore registers, return.
#
.globl kerneltrap
@ -13,7 +13,7 @@ kernelvec:
# make room to save registers.
addi sp, sp, -256
# save the registers.
# save caller-saved registers.
sd ra, 0(sp)
sd sp, 8(sp)
sd gp, 16(sp)
@ -21,8 +21,6 @@ kernelvec:
sd t0, 32(sp)
sd t1, 40(sp)
sd t2, 48(sp)
sd s0, 56(sp)
sd s1, 64(sp)
sd a0, 72(sp)
sd a1, 80(sp)
sd a2, 88(sp)
@ -31,16 +29,6 @@ kernelvec:
sd a5, 112(sp)
sd a6, 120(sp)
sd a7, 128(sp)
sd s2, 136(sp)
sd s3, 144(sp)
sd s4, 152(sp)
sd s5, 160(sp)
sd s6, 168(sp)
sd s7, 176(sp)
sd s8, 184(sp)
sd s9, 192(sp)
sd s10, 200(sp)
sd s11, 208(sp)
sd t3, 216(sp)
sd t4, 224(sp)
sd t5, 232(sp)
@ -57,8 +45,6 @@ kernelvec:
ld t0, 32(sp)
ld t1, 40(sp)
ld t2, 48(sp)
ld s0, 56(sp)
ld s1, 64(sp)
ld a0, 72(sp)
ld a1, 80(sp)
ld a2, 88(sp)
@ -67,16 +53,6 @@ kernelvec:
ld a5, 112(sp)
ld a6, 120(sp)
ld a7, 128(sp)
ld s2, 136(sp)
ld s3, 144(sp)
ld s4, 152(sp)
ld s5, 160(sp)
ld s6, 168(sp)
ld s7, 176(sp)
ld s8, 184(sp)
ld s9, 192(sp)
ld s10, 200(sp)
ld s11, 208(sp)
ld t3, 216(sp)
ld t4, 224(sp)
ld t5, 232(sp)