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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-10-22 08:13:22 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-29 13:15:20 +0100 |
| commit | aebd1fb45c622e9a2b06fb70665d084d3a8d6c78 (patch) | |
| tree | bbaa2fbe8031777db50609e15349c1f35344e10f /arch/powerpc/boot/crt0.S | |
| parent | powerpc/watchdog: help remote CPUs to flush NMI printk output (diff) | |
| download | linux-aebd1fb45c622e9a2b06fb70665d084d3a8d6c78.tar.xz linux-aebd1fb45c622e9a2b06fb70665d084d3a8d6c78.zip | |
powerpc: flexible GPR range save/restore macros
Introduce macros that operate on a (start, end) range of GPRs, which
reduces lines of code and need to do mental arithmetic while reading the
code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211022061322.2671178-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/boot/crt0.S')
| -rw-r--r-- | arch/powerpc/boot/crt0.S | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S index 1d83966f5ef6..e8f10a599659 100644 --- a/arch/powerpc/boot/crt0.S +++ b/arch/powerpc/boot/crt0.S @@ -226,16 +226,19 @@ p_base: mflr r10 /* r10 now points to runtime addr of p_base */ #ifdef __powerpc64__ #define PROM_FRAME_SIZE 512 -#define SAVE_GPR(n, base) std n,8*(n)(base) -#define REST_GPR(n, base) ld n,8*(n)(base) -#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base) -#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base) -#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base) -#define SAVE_10GPRS(n, base) SAVE_8GPRS(n, base); SAVE_2GPRS(n+8, base) -#define REST_2GPRS(n, base) REST_GPR(n, base); REST_GPR(n+1, base) -#define REST_4GPRS(n, base) REST_2GPRS(n, base); REST_2GPRS(n+2, base) -#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base) -#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base) + +.macro OP_REGS op, width, start, end, base, offset + .Lreg=\start + .rept (\end - \start + 1) + \op .Lreg,\offset+\width*.Lreg(\base) + .Lreg=.Lreg+1 + .endr +.endm + +#define SAVE_GPRS(start, end, base) OP_REGS std, 8, start, end, base, 0 +#define REST_GPRS(start, end, base) OP_REGS ld, 8, start, end, base, 0 +#define SAVE_GPR(n, base) SAVE_GPRS(n, n, base) +#define REST_GPR(n, base) REST_GPRS(n, n, base) /* prom handles the jump into and return from firmware. The prom args pointer is loaded in r3. */ @@ -246,9 +249,7 @@ prom: stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */ SAVE_GPR(2, r1) - SAVE_GPR(13, r1) - SAVE_8GPRS(14, r1) - SAVE_10GPRS(22, r1) + SAVE_GPRS(13, 31, r1) mfcr r10 std r10,8*32(r1) mfmsr r10 @@ -283,9 +284,7 @@ prom: /* Restore other registers */ REST_GPR(2, r1) - REST_GPR(13, r1) - REST_8GPRS(14, r1) - REST_10GPRS(22, r1) + REST_GPRS(13, 31, r1) ld r10,8*32(r1) mtcr r10 |