diff options
| author | wdenk <wdenk> | 2003-07-24 23:38:38 +0000 |
|---|---|---|
| committer | wdenk <wdenk> | 2003-07-24 23:38:38 +0000 |
| commit | 27b207fd0a0941b03f27e2a82c0468b1a090c745 (patch) | |
| tree | 4d339d7a2a00889f09a876425ce430be57de56e9 /cpu/ppc4xx/start.S | |
| parent | 2535d60277cc295adf75cd5721dcecd840c69a63 (diff) | |
* Implement new mechanism to export U-Boot's functions to standalone
applications: instead of using (PPC-specific) system calls we now
use a jump table; please see doc/README.standalone for details
* Patch by Dave Westwood, 24 Jul 2003:
added support for Unity OS (a proprietary OS)
Diffstat (limited to 'cpu/ppc4xx/start.S')
| -rw-r--r-- | cpu/ppc4xx/start.S | 70 |
1 files changed, 1 insertions, 69 deletions
diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S index aa857d030..e3e92afa8 100644 --- a/cpu/ppc4xx/start.S +++ b/cpu/ppc4xx/start.S @@ -769,75 +769,7 @@ ProgramCheck: STD_EXCEPTION(0x900, Decrementer, timer_interrupt) STD_EXCEPTION(0xa00, Trap_0a, UnknownException) STD_EXCEPTION(0xb00, Trap_0b, UnknownException) - - . = 0xc00 -/* - * r0 - SYSCALL number - * r3-... arguments - */ -SystemCall: - addis r11,r0,0 /* get functions table addr */ - ori r11,r11,0 /* Note: this code is patched in trap_init */ - addis r12,r0,0 /* get number of functions */ - ori r12,r12,0 - - cmplw 0, r0, r12 - bge 1f - - rlwinm r0,r0,2,0,31 /* fn_addr = fn_tbl[r0] */ - add r11,r11,r0 - lwz r11,0(r11) - - li r20,0xd00-4 /* Get stack pointer */ - lwz r12,0(r20) - subi r12,r12,12 /* Adjust stack pointer */ - li r0,0xc00+_end_back-SystemCall - cmplw 0, r0, r12 /* Check stack overflow */ - bgt 1f - stw r12,0(r20) - - mflr r0 - stw r0,0(r12) - mfspr r0,SRR0 - stw r0,4(r12) - mfspr r0,SRR1 - stw r0,8(r12) - - li r12,0xc00+_back-SystemCall - mtlr r12 - mtspr SRR0,r11 - -1: SYNC - rfi - -_back: - - mfmsr r11 /* Disable interrupts */ - li r12,0 - ori r12,r12,MSR_EE - andc r11,r11,r12 - SYNC /* Some chip revs need this... */ - mtmsr r11 - SYNC - - li r12,0xd00-4 /* restore regs */ - lwz r12,0(r12) - - lwz r11,0(r12) - mtlr r11 - lwz r11,4(r12) - mtspr SRR0,r11 - lwz r11,8(r12) - mtspr SRR1,r11 - - addi r12,r12,12 /* Adjust stack pointer */ - li r20,0xd00-4 - stw r12,0(r20) - - SYNC - rfi -_end_back: - + STD_EXCEPTION(0xc00, SystemCall, UnknownException) STD_EXCEPTION(0xd00, SingleStep, UnknownException) STD_EXCEPTION(0xe00, Trap_0e, UnknownException) |