diff options
| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-10-22 16:13:22 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-11-29 23:15:20 +1100 |
| commit | aebd1fb45c622e9a2b06fb70665d084d3a8d6c78 (patch) | |
| tree | bbaa2fbe8031777db50609e15349c1f35344e10f /arch/powerpc/include/asm/ppc_asm.h | |
| parent | powerpc/watchdog: help remote CPUs to flush NMI printk output (diff) | |
| download | linux-dev-aebd1fb45c622e9a2b06fb70665d084d3a8d6c78.tar.xz linux-dev-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/include/asm/ppc_asm.h')
| -rw-r--r-- | arch/powerpc/include/asm/ppc_asm.h | 43 |
1 files changed, 27 insertions, 16 deletions
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 7be24048b8d1..f21e6bde17a1 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -17,29 +17,40 @@ #define SZL (BITS_PER_LONG/8) /* + * This expands to a sequence of operations with reg incrementing from + * start to end inclusive, of this form: + * + * op reg, (offset + (width * reg))(base) + * + * Note that offset is not the offset of the first operation unless start + * is zero (or width is zero). + */ +.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 + +/* * Macros for storing registers into and loading registers from * exception frames. */ #ifdef __powerpc64__ -#define SAVE_GPR(n, base) std n,GPR0+8*(n)(base) -#define REST_GPR(n, base) ld n,GPR0+8*(n)(base) -#define SAVE_NVGPRS(base) SAVE_8GPRS(14, base); SAVE_10GPRS(22, base) -#define REST_NVGPRS(base) REST_8GPRS(14, base); REST_10GPRS(22, base) +#define SAVE_GPRS(start, end, base) OP_REGS std, 8, start, end, base, GPR0 +#define REST_GPRS(start, end, base) OP_REGS ld, 8, start, end, base, GPR0 +#define SAVE_NVGPRS(base) SAVE_GPRS(14, 31, base) +#define REST_NVGPRS(base) REST_GPRS(14, 31, base) #else -#define SAVE_GPR(n, base) stw n,GPR0+4*(n)(base) -#define REST_GPR(n, base) lwz n,GPR0+4*(n)(base) -#define SAVE_NVGPRS(base) SAVE_GPR(13, base); SAVE_8GPRS(14, base); SAVE_10GPRS(22, base) -#define REST_NVGPRS(base) REST_GPR(13, base); REST_8GPRS(14, base); REST_10GPRS(22, base) +#define SAVE_GPRS(start, end, base) OP_REGS stw, 4, start, end, base, GPR0 +#define REST_GPRS(start, end, base) OP_REGS lwz, 4, start, end, base, GPR0 +#define SAVE_NVGPRS(base) SAVE_GPRS(13, 31, base) +#define REST_NVGPRS(base) REST_GPRS(13, 31, base) #endif -#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) +#define SAVE_GPR(n, base) SAVE_GPRS(n, n, base) +#define REST_GPR(n, base) REST_GPRS(n, n, base) #define SAVE_FPR(n, base) stfd n,8*TS_FPRWIDTH*(n)(base) #define SAVE_2FPRS(n, base) SAVE_FPR(n, base); SAVE_FPR(n+1, base) |