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| author | andrew <andrew@FreeBSD.org> | 2013-11-24 20:33:38 +0000 |
|---|---|---|
| committer | andrew <andrew@FreeBSD.org> | 2013-11-24 20:33:38 +0000 |
| commit | 85b1d13becc8cca0d14212e86fb4ca668ec2f004 (patch) | |
| tree | 4da92367cd8dcb45e10bac2ad7e792e436c2c277 | |
| parent | ecc1dc848ca0475015e0b4f6eef3257d42131033 (diff) | |
| download | FreeBSD-src-85b1d13becc8cca0d14212e86fb4ca668ec2f004.zip FreeBSD-src-85b1d13becc8cca0d14212e86fb4ca668ec2f004.tar.gz | |
Recent versions of U-Boot require us to also backup and restore r9 for API
calls to work.
| -rw-r--r-- | sys/boot/arm/uboot/start.S | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/sys/boot/arm/uboot/start.S b/sys/boot/arm/uboot/start.S index 8af47f3..6e8f117 100644 --- a/sys/boot/arm/uboot/start.S +++ b/sys/boot/arm/uboot/start.S @@ -39,9 +39,10 @@ _start: ldr ip, =uboot_address str sp, [ip] - /* Save U-Boot's r8 */ + /* Save U-Boot's r8 and r9 */ ldr ip, =saved_regs str r8, [ip, #0] + str r9, [ip, #4] #ifdef _ARM_ARCH_6 mrc p15, 0, r2, c1, c0, 0 @@ -57,21 +58,24 @@ _start: * syscall() */ ENTRY(syscall) - /* Save caller's lr and r8 */ + /* Save caller's lr, r8 and r9 */ ldr ip, =saved_regs - str lr, [ip, #4] str r8, [ip, #8] - /* Restore U-Boot's r8 */ + str r9, [ip, #12] + str lr, [ip, #16] + /* Restore U-Boot's r8 and r9 */ ldr r8, [ip, #0] + ldr r9, [ip, #4] /* Call into U-Boot */ ldr lr, =return_from_syscall ldr ip, =syscall_ptr ldr pc, [ip] return_from_syscall: - /* Restore loader's r8 and lr */ + /* Restore loader's r8, r9 and lr */ ldr ip, =saved_regs + ldr lr, [ip, #16] + ldr r9, [ip, #12] ldr r8, [ip, #8] - ldr lr, [ip, #4] /* Return to caller */ mov pc, lr @@ -90,5 +94,7 @@ uboot_address: saved_regs: .long 0 /* U-Boot's r8 */ + .long 0 /* U-Boot's r9 */ .long 0 /* Loader's r8 */ + .long 0 /* Loader's r9 */ .long 0 /* Loader's lr */ |
