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sh: rework register restore code for sh3/sh4/sh4a

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This patch reworks the sh3/sh4/sh4a register restore code in
the following ways:
 - break out restore_regs() from restore_all()
 - the register saving order is unchanged
 - use restore_regs() in sh_bios_handler and restore_all
 - document the function

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-02-23 07:15:07 +00:00 committed by Paul Mundt
parent 1d015cf02a
commit 1dd22722f6
1 changed files with 33 additions and 35 deletions
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68
arch/sh/kernel/cpu/sh3/entry.S
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@ -188,44 +188,35 @@ call_dae:
#if defined(CONFIG_SH_STANDARD_BIOS)
/* Unwind the stack and jmp to the debug entry */
ENTRY(sh_bios_handler)
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
mov.l @r15+, r3
mov.l @r15+, r4
mov.l @r15+, r5
mov.l @r15+, r6
mov.l @r15+, r7
stc sr, r8
mov.l 1f, r9 ! BL =1, RB=1, IMASK=0x0F
or r9, r8
ldc r8, sr ! here, change the register bank
mov.l @r15+, r8
mov.l @r15+, r9
mov.l @r15+, r10
mov.l @r15+, r11
mov.l @r15+, r12
mov.l @r15+, r13
mov.l @r15+, r14
mov.l @r15+, k0
ldc.l @r15+, spc
lds.l @r15+, pr
mov.l @r15+, k1
ldc.l @r15+, gbr
lds.l @r15+, mach
lds.l @r15+, macl
mov k0, r15
mov.l 1f, r8
bsr restore_regs
nop
lds k2, pr ! restore pr
mov k4, r15
!
mov.l 2f, k0
mov.l @k0, k0
jmp @k0
ldc k1, ssr
ldc k3, ssr
.align 2
1: .long 0x300000f0
2: .long gdb_vbr_vector
#endif /* CONFIG_SH_STANDARD_BIOS */
restore_all:
! restore_regs()
! - restore r0, r1, r2, r3, r4, r5, r6, r7 from the stack
! - switch bank
! - restore r8, r9, r10, r11, r12, r13, r14, r15 from the stack
! - restore spc, pr*, ssr, gbr, mach, macl, skip default tra
! k2 returns original pr
! k3 returns original sr
! k4 returns original stack pointer
! r8 passes SR bitmask, overwritten with restored data on return
! r9 trashed
! BL=0 on entry, on exit BL=1 (depending on r8).
restore_regs:
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
@ -235,10 +226,9 @@ restore_all:
mov.l @r15+, r6
mov.l @r15+, r7
!
stc sr, r8
mov.l 7f, r9
or r9, r8 ! BL =1, RB=1
ldc r8, sr ! here, change the register bank
stc sr, r9
or r8, r9
ldc r9, sr
!
mov.l @r15+, r8
mov.l @r15+, r9
@ -249,12 +239,20 @@ restore_all:
mov.l @r15+, r14
mov.l @r15+, k4 ! original stack pointer
ldc.l @r15+, spc
lds.l @r15+, pr
mov.l @r15+, k2 ! original PR
mov.l @r15+, k3 ! original SR
ldc.l @r15+, gbr
lds.l @r15+, mach
lds.l @r15+, macl
add #4, r15 ! Skip syscall number
rts
add #4, r15 ! Skip syscall number
restore_all:
mov.l 7f, r8
bsr restore_regs
nop
lds k2, pr ! restore pr
!
#ifdef CONFIG_SH_DSP
mov.l @r15+, k0 ! DSP mode marker