write_wb_reg()里的switch macro展开
4.19\arch\arm64\kernel\Hw_breakpoint.c
static void write_wb_reg(int reg, int n, u64 val) { switch (reg + n) { GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_BVR, AARCH64_DBG_REG_NAME_BVR, val); GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_BCR, AARCH64_DBG_REG_NAME_BCR, val); GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_WVR, AARCH64_DBG_REG_NAME_WVR, val); GEN_WRITE_WB_REG_CASES(AARCH64_DBG_REG_WCR, AARCH64_DBG_REG_NAME_WCR, val); default: pr_warning("attempt to write to unknown breakpoint register %d\n", n); } isb(); } above switch expanding as below: switch (reg + n) { /* wvr(breakpoint value register) */ case (0): \ do {\ write_sysreg(val, dbgbvr0_el1);\ } while (0); \ break; case (1): \ do {\ write_sysreg(val, dbgbvr1_el1);\ } while (0); \ break; case (15): \ do {\ write_sysreg(val, dbgbvr15_el1);\ } while (0); \ break; /* wvr(breakpoint ctrl register) */ case (16 + 0): \ do {\ write_sysreg(VAL, dbgbcr0_el1);\ } while (0); \ break case (16 + 1): \ do {\ write_sysreg(VAL, dbgbcr1_el1);\ } while (0); \ break case (16 + 15): \ do {\ write_sysreg(VAL, dbgbcr15_el1);\ } while (0); \ break /* wvr(watchpoint value register) */ case (32 + 0): \ do {\ write_sysreg(VAL, dbgwvr0_el1);\ } while (0); \ break case (32 + 1): \ do {\ write_sysreg(VAL, dbgwvr1_el1);\ } while (0); \ break case (32 + 15): \ do {\ write_sysreg(VAL, dbgwvr15_el1);\ } while (0); \ break /* wvr(watchpoint ctrl register) */ case (48 + 0): \ do {\ write_sysreg(VAL, dbgwcr0_el1);\ } while (0); \ break case (48 + 1): \ do {\ write_sysreg(VAL, dbgwcr1_el1);\ } while (0); \ break case (48 + 15): \ do {\ write_sysreg(VAL, dbgwcr15_el1);\ } while (0); \ break }
bvr/bcr/wvr/wcr寄存器分别为breakpoint value register/breakpoint ctrl register/watchpoint value register/watchpoint ctrl register
这些寄存器描述见下面链接:
https://developer.arm.com/documentation/ddi0500/e/debug/memory-mapped-register-summary